Group parameters

232TH

Energy: Fast Neutrons

4-Groups
Original Model - J. E. BROLLEY, J. S. LEVINGER, M. B. SAMPSON, and R. G. WILKINSON, Delayed Neutrons from Thorium, Metallurgical Laboratory report CP-787 (U), Univ. of Chicago (July 16, 1943).

#	Half-life [s]	Relative abundance a(i)
1	56.5 ± 0.000	0.057 ± 0.006
2	22.5 ± 0.000	0.155 ± 0.015
3	7 ± 0.000	0.232 ± 0.023
4	1.35 ± 0.000	0.556 ± 0.056

Average Half-life : 9.08 ± .50 s

6-Groups
Expanded Model using a fixed set of Half-lives
G. D. Spriggs, J. M. Campbell and V. M. Piksaikin, An 8-Group Neutron Model Based on a Consistent Set of Half-Lives, Los Alamos National Laboratory report LA-UR-98-1619, Rev. 3, (October 6, 1999).

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.064 ± 0.006
2	24.5	0.006 ± 0.006
3	16.3	0.251 ± 0.019
4	5.21	0.012 ± 0.008
5	2.37	0.371 ± 0.038
6	1.04	0.296 ± 0.044

Average Half-life : 9.05 ± .50 s

5-Groups
Original Model - L. G. CREVELING, J. R. HOOD, and M. L. POOL, Delayed Neutrons from Thorium, Physical Review, 76, No. 7, 946 (October 1, 1949).

#	Half-life [s]	Relative abundance a(i)
1	55.6 ± 0.000	0.041 ± 0.004
2	22.0 ± 0.000	0.146 ± 0.015
3	4.50 ± 0.000	0.292 ± 0.029
4	1.50 ± 0.000	0.267 ± 0.027
5	0.130 ± 0.000	0.255 ± 0.026

Average Half-life : 7.22 ± .42 s

8-Groups
Expanded Model using a fixed set of Half-lives
G. D. Spriggs, J. M. Campbell and V. M. Piksaikin, An 8-Group Neutron Model Based on a Consistent Set of Half-Lives, Los Alamos National Laboratory report LA-UR-98-1619, Rev. 3, (October 6, 1999).

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.0232 ± 0.004
2	24.5	0.0023 ± 0.012
3	16.3	0.2636 ± 0.009
4	5.21	0.0023 ± 0.022
5	2.37	0.3916 ± 0.030
6	1.04	0.0023 ± 0.0001
7	0.424	0.0023 ± 0.0001
8	0.195	0.3124 ± 0.028

Average Half-life : 6.65 ± .42 s

5-Groups
Original Model - H. ROSE and R. D. SMITH, Delayed Neutron Investigations with the ZEPHYR Fast Reactor, Part II�The Delayed Neutrons Arising from Fast Fission in 235U, 233U, 238U, 239Pu, and 232Th, J. Nucl. Energy, 4, 133 (1957).

#	Half-life [s]	Relative abundance a(i)
1	55.6 ± 0.000	0.033 ± 0.002
2	22.0 ± 0.000	0.134 ± 0.008
3	4.51 ± 0.000	0.308 ± 0.024
4	1.52 ± 0.000	0.400 ± 0.032
5	0.430 ± 0.000	0.125 ± 0.030

Average Half-life : 6.83 ± .24 s

7-Groups
Expanded Model using a fixed set of Half-lives
G. D. Spriggs, J. M. Campbell and V. M. Piksaikin, An 8-Group Neutron Model Based on a Consistent Set of Half-Lives, Los Alamos National Laboratory report LA-UR-98-1619, Rev. 3, (October 6, 1999).

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.034 ± 0.002
2	24.5	0.074 ± 0.006
3	16.3	0.073 ± 0.005
4	5.21	0.162 ± 0.019
5	2.37	0.366 ± 0.027
6	1.04	0.181 ± 0.024
7	0.424	0.110 ± 0.029

Average Half-life : 6.84 ± .24 s

Energy: Fast Spectrum

#	Half-life [s]	Relative abundance a(i)
1	56.0 ± 0.095	0.034 ± 0.002
2	20.8 ± 0.660	0.150 ± 0.005
3	5.74 ± 0.240	0.155 ± 0.021
4	2.16 ± 0.080	0.446 ± 0.015
5	0.571 ± 0.042	0.172 ± 0.013
6	0.211 ± 0.019	0.043 ± 0.006

Average Half-life : 6.98 ± .23 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.033 ± 0.002
2	24.5	0.073 ± 0.005
3	16.3	0.093 ± 0.002
4	5.21	0.136 ± 0.024
5	2.37	0.381 ± 0.008
6	1.04	0.140 ± 0.008
7	0.424	0.114 ± 0.013
8	0.195	0.028 ± 0.001

Average Half-life : 6.98 ± .23 s

5-Groups
Original Model - R. W. WALDO, R. A. KARAM, R. A. MEYER, Delayed Neutron Yields: Time Dependent Measurements and a Predictive Model, Physical Review C, 23, No. 3, 1113 (March 1981).

#	Half-life [s]	Relative abundance a(i)
1	55.4 ± 0.089	0.036 ± 0.001
2	21.4 ± 0.079	0.140 ± 0.005
3	5.22 ± 0.100	0.265 ± 0.012
4	1.59 ± 0.073	0.402 ± 0.002
5	0.39 ± 0.140	0.157 ± 0.006

Average Half-life : 7.07 ± .16 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.038 ± 0.003
2	24.5	0.055 ± 0.001
3	16.3	0.112 ± 0.002
4	5.21	0.159 ± 0.015
5	2.37	0.320 ± 0.006
6	1.04	0.168 ± 0.003
7	0.424	0.136 ± 0.003
8	0.195	0.013 ± 0.0003

Average Half-life : 7.08 ± .17 s

Energy: 1.6 MeV

5-Groups
Original Model - B. P. MAKSYUTENKO, Variation of Cumulative Yields of Fragments of Precursors of Delayed Neutrons of 232Th, Fiziko-Energeticheskii Institut, FEI-195 (1965). B. P. MAKSYUTENKO et al., Variation of Relative Yields of Delayed Neutrons, Proc. Sympos. on Physics and Chemistry of Fission, Int. Atomic Energy Agency, Vienna, Vol 2., 215 (March 22-26, 1965).

#	Half-life [s]	Relative abundance a(i)
1	55.0 ± 0.000	0.048 ± 0.005
2	24.0 ± 0.000	0.071 ± 0.004
3	15.5 ± 0.000	0.129 ± 0.005
4	5.20 ± 0.000	0.133 ± 0.007
5	2.20 ± 0.000	0.619 ± 0.015

Average Half-life : 8.42 ± .30 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.052 ± 0.005
2	24.5	0.022 ± 0.004
3	16.3	0.194 ± 0.006
4	5.21	0.057 ± 0.006
5	2.37	0.657 ± 0.015
6	1.04	0.019 ± 0.003

Average Half-life : 8.43 ± .30 s

Energy: 1.9 MeV

5-Groups
Original Model - B. P. MAKSYUTENKO et al., Variation of Relative Yields of Delayed Neutrons, Proc. Sympos. on Physics and Chemistry of Fission, Int. Atomic Energy Agency, Vienna, Vol 2., 215 (March 22-26, 1965).

#	Half-life [s]	Relative abundance a(i)
1	55.0 ± 0.000	0.057 ± 0.006
2	24.0 ± 0.000	0.108 ± 0.003
3	15.5 ± 0.000	0.135 ± 0.005
4	5.20 ± 0.000	0.212 ± 0.006
5	2.20 ± 0.000	0.489 ± 0.011

Average Half-life : 9.98 ± .33 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.059 ± 0.006
2	24.5	0.063 ± 0.004
3	16.3	0.192 ± 0.005
4	5.21	0.152 ± 0.006
5	2.37	0.520 ± 0.011
6	1.04	0.015 ± 0.003

Average Half-life : 10.00 ± .33 s

Energy: 2.2 MeV

#	Half-life [s]	Relative abundance a(i)
1	55.0 ± 0.000	0.060 ± 0.006
2	24.0 ± 0.000	0.116 ± 0.002
3	15.5 ± 0.000	0.136 ± 0.004
4	5.20 ± 0.000	0.206 ± 0.005
5	2.20 ± 0.000	0.481 ± 0.008

Average Half-life : 10.35 ± .34 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.062 ± 0.006
2	24.5	0.072 ± 0.003
3	16.3	0.194 ± 0.003
4	5.21	0.147 ± 0.005
5	2.37	0.511 ± 0.008
6	1.04	0.015 ± 0.002

Average Half-life : 10.36 ± .34 s

Energy: 2.4 MeV

5-Groups
Original Model - B. P. MAKSYUTENKO, Relative Yields of Delayed Neutrons in Fission of 238U, 235U and 232Th by Fast Neutrons, J. Exptl. Theoret. Phys. (USSR) 35, 815 (September 1, 1958).

#	Half-life [s]	Relative abundance a(i)
1	53.3 ± 0.000	0.038 ± 0.004
2	19.6 ± 0.000	0.127 ± 0.013
3	6.37 ± 0.000	0.195 ± 0.020
4	2.08 ± 0.000	0.408 ± 0.041
5	0.651 ± 0.000	0.232 ± 0.023

Average Half-life : 6.76 ± .36 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.031 ± 0.004
2	24.5	0.073 ± 0.007
3	16.3	0.072 ± 0.013
4	5.21	0.243 ± 0.020
5	2.37	0.204 ± 0.035
6	1.04	0.314 ± 0.028
7	0.424	0.065 ± 0.012

Average Half-life : 6.75 ± .36 s

Energy: 2.6 MeV

#	Half-life [s]	Relative abundance a(i)
1	55.0 ± 0.000	0.071 ± 0.007
2	24.0 ± 0.000	0.145 ± 0.002
3	15.5 ± 0.000	0.139 ± 0.003
4	5.20 ± 0.000	0.230 ± 0.006
5	2.20 ± 0.000	0.415 ± 0.009

Average Half-life : 11.66 ± .40 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.073 ± 0.007
2	24.5	0.103 ± 0.003
3	16.3	0.192 ± 0.002
4	5.21	0.179 ± 0.006
5	2.37	0.441 ± 0.009
6	1.04	0.013 ± 0.002

Average Half-life : 11.68 ± .40 s

Energy: 3.3 MeV

#	Half-life [s]	Relative abundance a(i)
1	55.0 ± 0.000	0.037 ± 0.004
2	21.6 ± 0.000	0.137 ± 0.014
3	6.61 ± 0.000	0.190 ± 0.019
4	2.07 ± 0.000	0.423 ± 0.042
5	0.664 ± 0.000	0.213 ± 0.021

Average Half-life : 7.27 ± .40 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.034 ± 0.004
2	24.5	0.089 ± 0.010
3	16.3	0.072 ± 0.013
4	5.21	0.217 ± 0.018
5	2.37	0.234 ± 0.037
6	1.04	0.299 ± 0.027
7	0.424	0.054 ± 0.010

Average Half-life : 7.26 ± .40 s

Energy: 5 MeV

5-Groups
Original Model - B. P. MAKSYUTENKO, V. K. PYSHIN, and M. Z. TARASKO, The Reaction (n,nf) and Yields of Delayed Neutrons from 232Th, Soviet J. Nucl. Physics (English Translation), 5, No. 3, 375 (September 1, 1967).

#	Half-life [s]	Relative abundance a(i)
1	55.0 ± 0.000	0.048 ± 0.005
2	24.0 ± 0.000	0.115 ± 0.004
3	15.5 ± 0.000	0.116 ± 0.005
4	5.20 ± 0.000	0.234 ± 0.008
5	2.20 ± 0.000	0.487 ± 0.016

Average Half-life : 9.49 ± .29 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.050 ± 0.005
2	24.5	0.071 ± 0.003
3	16.3	0.173 ± 0.005
4	5.21	0.174 ± 0.007
5	2.37	0.518 ± 0.016
6	1.04	0.015 ± 0.004

Average Half-life : 9.50 ± .29 s

Energy: 6 MeV

#	Half-life [s]	Relative abundance a(i)
1	55.0 ± 0.000	0.047 ± 0.005
2	24.0 ± 0.000	0.119 ± 0.004
3	15.5 ± 0.000	0.109 ± 0.004
4	5.20 ± 0.000	0.224 ± 0.008
5	2.20 ± 0.000	0.501 ± 0.012

Average Half-life : 9.38 ± .28 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.049 ± 0.005
2	24.5	0.075 ± 0.004
3	16.3	0.166 ± 0.004
4	5.21	0.162 ± 0.007
5	2.37	0.533 ± 0.012
6	1.04	0.015 ± 0.003

Average Half-life : 9.40 ± .28 s

Energy: 6.2 MeV

#	Half-life [s]	Relative abundance a(i)
1	55.0 ± 0.000	0.047 ± 0.005
2	24.0 ± 0.000	0.149 ± 0.008
3	15.5 ± 0.000	0.067 ± 0.012
4	5.20 ± 0.000	0.377 ± 0.021
5	2.20 ± 0.000	0.361 ± 0.037

Average Half-life : 9.92 ± .40 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.0477 ± 0.47E-02
2	24.5	0.1159 ± 0.71E-02
3	16.3	0.1100 ± 0.13E-01
4	5.21	0.3308 ± 0.19E-01
5	2.37	0.3848 ± 0.37E-01
6	1.04	0.0108 ± 0.87E-02

Average Half-life : 9.93 ± .40 s

Energy: 6.4 MeV

#	Half-life [s]	Relative abundance a(i)
1	55.0 ± 0.000	0.048 ± 0.005
2	24.0 ± 0.000	0.111 ± 0.002
3	15.5 ± 0.000	0.111 ± 0.003
4	5.20 ± 0.000	0.212 ± 0.005
5	2.20 ± 0.000	0.518 ± 0.010

Average Half-life : 9.26 ± .27 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.050 ± 0.005
2	24.5	0.067 ± 0.002
3	16.3	0.169 ± 0.003
4	5.21	0.148 ± 0.004
5	2.37	0.551 ± 0.010
6	1.04	0.016 ± 0.002

Average Half-life : 9.28 ± .27 s

Energy: 6.6 MeV

#	Half-life [s]	Relative abundance a(i)
1	55.0 ± 0.000	0.050 ± 0.005
2	24.0 ± 0.000	0.120 ± 0.003
3	15.5 ± 0.000	0.113 ± 0.004
4	5.20 ± 0.000	0.217 ± 0.006
5	2.20 ± 0.000	0.500 ± 0.013

Average Half-life : 9.59 ± .29 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.052 ± 0.005
2	24.5	0.076 ± 0.003
3	16.3	0.171 ± 0.004
4	5.21	0.154 ± 0.006
5	2.37	0.532 ± 0.013
6	1.04	0.015 ± 0.003

Average Half-life : 9.61 ± .29 s

Energy: 6.8 MeV

#	Half-life [s]	Relative abundance a(i)
1	55.0 ± 0.000	0.048 ± 0.005
2	24.0 ± 0.000	0.108 ± 0.003
3	15.5 ± 0.000	0.111 ± 0.004
4	5.20 ± 0.000	0.171 ± 0.005
5	2.20 ± 0.000	0.563 ± 0.013

Average Half-life : 9.08 ± .29 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.051 ± 0.005
2	24.5	0.061 ± 0.003
3	16.3	0.172 ± 0.004
4	5.21	0.101 ± 0.004
5	2.37	0.598 ± 0.013
6	1.04	0.017 ± 0.003

Average Half-life : 9.09 ± .28 s

Energy: 7.25 MeV

#	Half-life [s]	Relative abundance a(i)
1	55.0 ± 0.000	0.064 ± 0.006
2	24.0 ± 0.000	0.125 ± 0.003
3	15.5 ± 0.000	0.134 ± 0.004
4	5.20 ± 0.000	0.235 ± 0.007
5	2.20 ± 0.000	0.442 ± 0.013

Average Half-life : 10.78 ± .37 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.065 ± 0.006
2	24.5	0.083 ± 0.003
3	16.3	0.188 ± 0.004
4	5.21	0.181 ± 0.006
5	2.37	0.469 ± 0.013
6	1.04	0.013 ± 0.003

Average Half-life : 10.79 ± .37 s

Energy: 7.5 MeV

#	Half-life [s]	Relative abundance a(i)
1	55.0 ± 0.000	0.059 ± 0.006
2	24.0 ± 0.000	0.110 ± 0.003
3	15.5 ± 0.000	0.126 ± 0.004
4	5.20 ± 0.000	0.180 ± 0.005
5	2.20 ± 0.000	0.526 ± 0.012

Average Half-life : 9.93 ± .34 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.062 ± 0.006
2	24.5	0.064 ± 0.003
3	16.3	0.185 ± 0.004
4	5.21	0.115 ± 0.005
5	2.37	0.558 ± 0.012
6	1.04	0.016 ± 0.003

Average Half-life : 9.94 ± .34 s

Energy: 7.75 MeV

#	Half-life [s]	Relative abundance a(i)
1	55.0 ± 0.000	0.066 ± 0.007
2	24.0 ± 0.000	0.097 ± 0.006
3	15.5 ± 0.000	0.156 ± 0.009
4	5.20 ± 0.000	0.162 ± 0.014
5	2.20 ± 0.000	0.519 ± 0.034

Average Half-life : 10.34 ± .42 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.068 ± 0.007
2	24.5	0.049 ± 0.005
3	16.3	0.217 ± 0.009
4	5.21	0.099 ± 0.011
5	2.37	0.551 ± 0.034
6	1.04	0.016 ± 0.008

Average Half-life : 10.35 ± .42 s

Energy: 14 MeV

5-Groups
Original Model - K. H. SUN, R. A. CHARPIE, F. A. PECJAK, B. JENNINGS, J. F. NECHAJ, and A. J. ALLEN, Delayed Neutrons from 238U and 232Th Fission, Physical Review, 79, No. 1, 3 (July 1, 1950); originally reported in Westinghouse Research Laboratories report NP-1464.

#	Half-life [s]	Relative abundance a(i)
1	56.0 ± 0.000	0.136 ± 0.014
2	20.0 ± 0.000	0.318 ± 0.032
3	4.40 ± 0.000	0.303 ± 0.030
4	1.40 ± 0.000	0.191 ± 0.019
5	0.410 ± 0.000	0.052 ± 0.005

Average Half-life : 15.62 ± 1.02 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.148 ± 0.014
2	24.5	0.015 ± 0.020
3	16.3	0.367 ± 0.026
4	5.21	0.016 ± 0.021
5	2.37	0.380 ± 0.027
6	1.04	0.015 ± 0.000
7	0.424	0.044 ± 0.009
8	0.195	0.015 ± 0.0003

Average Half-life : 15.61 ± 1.02 s

4-Groups
Original Model - G. HERMANN, J. FIEDLER, G. BENEDICT, W. ECKHARDT, G. LUTHARDT, P. PATZELT, and H. D. SCHUSSLER, Comparison of Observed Delayed-Neutron Abundances with Calculated Fission Yields of Neutron Precursors, Proc. Sympos. on Physics and Chemistry of Fission, Int. Atomic Energy Agency, Vienna, Vol 2., 197 (March 22-26, 1965).

#	Half-life [s]	Relative abundance a(i)
1	55.0 ± 0.000	0.070 ± 0.011
2	22.0 ± 0.000	0.208 ± 0.030
3	6.00 ± 0.000	0.237 ± 0.043
4	2.00 ± 0.000	0.485 ± 0.049

Average Half-life : 10.81 ± .94 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.077 ± 0.011
2	24.5	0.053 ± 0.022
3	16.3	0.218 ± 0.025
4	5.21	0.089 ± 0.040
5	2.37	0.521 ± 0.046
6	1.04	0.043 ± 0.019

Average Half-life : 10.85 ± .94 s

6-Groups
Original Model - G. HERMANN, Recent Work on Delayed Fission Neutrons at the University of Mainz, Proc. of a Panel on Delayed Fission Neutrons, Int. Atomic Energy Agency, Vienna, 147 (April 24-27, 1967).

#	Half-life [s]	Relative abundance a(i)
1	55.0 ± 0.000	0.066 ± 0.011
2	22.0 ± 0.000	0.191 ± 0.038
3	6.00 ± 0.000	0.175 ± 0.044
4	2.00 ± 0.000	0.306 ± 0.031
5	0.500 ± 0.000	0.153 ± 0.015
6	0.200 ± 0.000	0.109 ± 0.011

Average Half-life : 9.58 ± 1.07 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.064 ± 0.011
2	24.5	0.117 ± 0.030
3	16.3	0.102 ± 0.027
4	5.21	0.141 ± 0.044
5	2.37	0.245 ± 0.022
6	1.04	0.108 ± 0.021
7	0.424	0.123 ± 0.008
8	0.195	0.099 ± 0.012

Average Half-life : 9.58 ± 1.08 s

5-Groups
Original Model - A. NOTEA, Delayed Neutrons from Thermal and 14 MeV Neutron Fission of Uranium and Thorium, Research Laboratories Annual Report�January through December 1968, IA-1190, Israel AEC, 95 (1969).

#	Half-life [s]	Relative abundance a(i)
1	55.0 ± 0.000	0.044 ± 0.006
2	24.0 ± 0.000	0.177 ± 0.024
3	15.5 ± 0.000	0.196 ± 0.022
4	5.20 ± 0.000	0.544 ± 0.060
5	2.20 ± 0.000	0.040 ± 0.100

Average Half-life : 12.60 ± .83 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.043 ± 0.006
2	24.5	0.150 ± 0.021
3	16.3	0.221 ± 0.026
4	5.21	0.543 ± 0.055
5	2.37	0.042 ± 0.100
6	1.04	0.001 ± 0.024

Average Half-life : 12.60 ± .83 s

Energy: 14.8 MeV

4-Groups
Original Model - M. G. BROWN, S. J. LYLE, and E. B. M. MARTIN, Delayed Neutron Yields from 14.8 MeV Neutron Induced Fission of 238U, 232Th, and 231Pa, Radiochimica Acta, 15, No. 3, 109 (1971).

#	Half-life [s]	Relative abundance a(i)
1	53.8 ± 0.000	0.086 ± 0.009
2	19.1 ± 0.000	0.249 ± 0.025
3	6.42 ± 0.000	0.275 ± 0.028
4	2.15 ± 0.000	0.390 ± 0.039

Average Half-life : 11.96 ± .69 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.084 ± 0.008
2	24.5	0.019 ± 0.012
3	16.3	0.303 ± 0.025
4	5.21	0.185 ± 0.026
5	2.37	0.388 ± 0.037
6	1.04	0.021 ± 0.012

Average Half-life : 11.99 ± .69 s

6-Groups
Original Model - G. BENEDICT, G. LUTHARDT, and G. HERMANN, Delayed-Neutron Yields from Fission of 238U and 232Th by 14.8-MeV Neutrons, Radiochimica Acta, 17, No. 1, 61 (1972).

#	Half-life [s]	Relative abundance a(i)
1	56.0 ± 0.000	0.068 ± 0.007
2	18.8 ± 0.000	0.183 ± 0.018
3	5.10 ± 0.000	0.209 ± 0.021
4	2.14 ± 0.000	0.288 ± 0.029
5	0.600 ± 0.000	0.147 ± 0.015
6	0.150 ± 0.000	0.105 ± 0.010

Average Half-life : 9.05 ± .52 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.073 ± 0.007
2	24.5	0.007 ± 0.009
3	16.3	0.199 ± 0.017
4	5.21	0.133 ± 0.018
5	2.37	0.297 ± 0.029
6	1.04	0.132 ± 0.015
7	0.424	0.007 ± 0.008
8	0.195	0.151 ± 0.012

Average Half-life : 9.07 ± .53 s

Energy: 15 MeV

#	Half-life [s]	Relative abundance a(i)
1	53.8 ± 0.000	0.044 ± 0.004
2	19.1 ± 0.000	0.154 ± 0.015
3	6.42 ± 0.000	0.169 ± 0.017
4	2.15 ± 0.000	0.428 ± 0.043
5	0.553 ± 0.000	0.205 ± 0.021

Average Half-life : 7.43 ± .40 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.037 ± 0.004
2	24.5	0.074 ± 0.008
3	16.3	0.098 ± 0.015
4	5.21	0.209 ± 0.016
5	2.37	0.262 ± 0.039
6	1.04	0.219 ± 0.023
7	0.424	0.101 ± 0.015

Average Half-life : 7.42 ± .40 s

Energy: 28 MeV

3-Groups
Original Model - K. H. SUN, R. A. CHARPIE, F. A. PECJAK, B. JENNINGS, J. F. NECHAJ, and A. J. ALLEN, Delayed Neutrons from 238U and 232Th Fission, Physical Review, 79, No. 1, 3 (July 1, 1950); originally reported in Westinghouse Research Laboratories report NP- 1464.

#	Half-life [s]	Relative abundance a(i)
1	58.0 ± 0.000	0.189 ± 0.019
2	21.0 ± 0.000	0.373 ± 0.037
3	4.50 ± 0.000	0.439 ± 0.044

Average Half-life : 20.74 ± 1.36 s

5-Groups
Expanded Model using a fixed set of Half-lives
G. D. Spriggs, J. M. Campbell and V. M. Piksaikin, An 8-Group Neutron Model Based on a Consistent Set of Half-Lives, Los Alamos National Laboratory report LA-UR-98-1619, Rev. 3, (October 6, 1999).

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.185 ± 0.020
2	24.5	0.311 ± 0.025
3	16.3	0.018 ± 0.027
4	5.21	0.448 ± 0.040
5	2.37	0.038 ± 0.019

Average Half-life : 20.60 ± 1.36 s

Energy: 29 MeV

#	Half-life [s]	Relative abundance a(i)
1	57.0 ± 0.000	0.158 ± 0.023
2	23.0 ± 0.000	0.316 ± 0.045
3	4.50 ± 0.000	0.526 ± 0.005

Average Half-life : 18.63 ± 1.67 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.169 ± 0.023
2	24.5	0.255 ± 0.042
3	16.3	0.017 ± 0.013
4	5.21	0.499 ± 0.010
5	2.37	0.059 ± 0.001

Average Half-life : 18.68 ± 1.66 s

Energy: 3.2 MeV

#	Half-life [s]	Relative abundance a(i)
1	55.2 ± 0.640	0.031 ± 0.001
2	21.1 ± 0.340	0.145 ± 0.005
3	5.51 ± 0.160	0.147 ± 0.007
4	2.16 ± 0.053	0.459 ± 0.011
5	0.547 ± 0.027	0.178 ± 0.009
6	0.216 ± 0.011	0.040 ± 0.002

Average Half-life : 6.66 ± 0.12 s

8-Groups
Expanded Model using a fixed set of Half-lives
Expansion method: V.M. Piksaikin, L.E. Kazakov, S.G. Isaev, M.Z. Tarasko, V.A.Roshchenko, G.D. Spriggs, J.M. Campbell, Energy Dependence of Relative Abundances and Periods of Delayed Neutrons from Neutron Induced Fission of U-235, U-238, Pu-239 in 6- and 8-group Model Representation, Progress in Nuclear Energy, 2002, v.41, No.1-4, pp.203-222.

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.029 ± 0.001
2	24.5	0.078 ± 0.003
3	16.3	0.081 ± 0.003
4	5.21	0.121 ± 0.005
5	2.37	0.406 ± 0.010
6	1.04	0.133 ± 0.006
7	0.424	0.115 ± 0.005
8	0.195	0.036 ± 0.002

Average Half-life : 6.65 ± 0.12 s

Energy: 3.8 MeV

#	Half-life [s]	Relative abundance a(i)
1	55.2 ± 0.270	0.031 ± 0.0005
2	20.6 ± 0.140	0.149 ± 0.002
3	5.81 ± 0.070	0.151 ± 0.003
4	2.21 ± 0.022	0.456 ± 0.005
5	0.592 ± 0.011	0.174 ± 0.003
6	0.214 ± 0.004	0.039 ± 0.001

Average Half-life : 6.78 ± 0.06 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.029 ± 0.001
2	24.5	0.072 ± 0.003
3	16.3	0.095 ± 0.003
4	5.21	0.136 ± 0.006
5	2.37	0.394 ± 0.010
6	1.04	0.142 ± 0.007
7	0.424	0.099 ± 0.005
8	0.195	0.033 ± 0.001

Average Half-life : 6.77 ± 0.12 s

Energy: 4.2 MeV

#	Half-life [s]	Relative abundance a(i)
1	54.2 ± 0.270	0.031 ± 0.001
2	20.9 ± 0.150	0.145 ± 0.002
3	5.95 ± 0.068	0.153 ± 0.003
4	2.22 ± 0.022	0.457 ± 0.005
5	0.598 ± 0.011	0.175 ± 0.003
6	0.215 ± 0.004	0.040 ± 0.001

Average Half-life : 6.73 ± 0.06 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.027 ± 0.001
2	24.5	0.079 ± 0.003
3	16.3	0.085 ± 0.003
4	5.21	0.148 ± 0.006
5	2.37	0.382 ± 0.010
6	1.04	0.15 ± 0.007
7	0.424	0.097 ± 0.004
8	0.195	0.032 ± 0.001

Average Half-life : 6.72 ± 0.12 s

Energy: 4.5 MeV

#	Half-life [s]	Relative abundance a(i)
1	53.8 ± 0.340	0.032 ± 0.001
2	20.3 ± 0.190	0.144 ± 0.003
3	5.54 ± 0.093	0.149 ± 0.003
4	2.09 ± 0.030	0.466 ± 0.006
5	0.582 ± 0.014	0.167 ± 0.004
6	0.213 ± 0.005	0.041 ± 0.001

Average Half-life : 6.57 ± 0.08 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.028 ± 0.001
2	24.5	0.073 ± 0.003
3	16.3	0.087 ± 0.003
4	5.21	0.123 ± 0.005
5	2.37	0.390 ± 0.010
6	1.04	0.177 ± 0.008
7	0.424	0.090 ± 0.004
8	0.195	0.031 ± 0.001

Average Half-life : 6.58 ± 0.12 s

Energy: 4.7 MeV

#	Half-life [s]	Relative abundance a(i)
1	54.3 ± 0.300	0.032 ± 0.001
2	20.5 ± 0.160	0.145 ± 0.003
3	5.53 ± 0.070	0.157 ± 0.003
4	2.07 ± 0.020	0.460 ± 0.005
5	0.583 ± 0.012	0.163 ± 0.004
6	0.213 ± 0.005	0.042 ± 0.001

Average Half-life : 6.63 ± 0.07 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.029 ± 0.001
2	24.5	0.073 ± 0.003
3	16.3	0.089 ± 0.003
4	5.21	0.128 ± 0.005
5	2.37	0.384 ± 0.010
6	1.04	0.178 ± 0.008
7	0.424	0.087 ± 0.004
8	0.195	0.031 ± 0.001

Average Half-life : 6.64 ± 0.12 s

Energy: 4.9 MeV

#	Half-life [s]	Relative abundance a(i)
1	54.1 ± 0.380	0.033 ± 0.001
2	20.3 ± 0.190	0.149 ± 0.003
3	5.67 ± 0.090	0.147 ± 0.004
4	2.16 ± 0.030	0.471 ± 0.007
5	0.568 ± 0.016	0.158 ± 0.005
6	0.213 ± 0.006	0.041 ± 0.001

Average Half-life : 6.65 ± 0.09 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.029 ± 0.001
2	24.5	0.068 ± 0.003
3	16.3	0.098 ± 0.003
4	5.21	0.118 ± 0.005
5	2.37	0.404 ± 0.010
6	1.04	0.161 ± 0.007
7	0.424	0.089 ± 0.004
8	0.195	0.033 ± 0.001

Average Half-life : 6.66 ± 0.12 s

Energy: 5.1 MeV

#	Half-life [s]	Relative abundance a(i)
1	53.9 ± 0.530	0.032 ± 0.001
2	20.3 ± 0.310	0.141 ± 0.005
3	5.62 ± 0.130	0.159 ± 0.007
4	2.10 ± 0.050	0.446 ± 0.009
5	0.559 ± 0.027	0.181 ± 0.008
6	0.214 ± 0.011	0.041 ± 0.002

Average Half-life : 6.51 ± 0.11 s

Energy: 14.23 MeV

6-Groups
Original Model - V.A. Roshchenko, V.M.Piksaikin et al., Temporary characteristics of delayed neutrons and partial cross sections of emissive fission in fission of 232Th by neutrons in the energy range from 3.2-17.9 MeV, Nuclear Physics, 2010, vol.73, No.6, pp.947-955. (in russian)

#	Half-life [s]	Relative abundance a(i)
1	56.3 ± 0.411	0.039 ± 0.001
2	21.3 ± 0.197	0.149 ± 0.003
3	5.45 ± 0.082	0.161 ± 0.003
4	2.27 ± 0.030	0.482 ± 0.006
5	0.578 ± 0.012	0.130 ± 0.003
6	0.214 ± 0.005	0.038 ± 0.001

Average Half-life : 7.43 ± 0.08 s

Correlation matrix

	a1	T1	a2	T2	a3	T3	a4	T4	a5	T5	a6	T6
a1	1
T1	0	1
a2	0	0.66	1
T2	0	0.19	-0.07	1
a3	0	0.19	0.08	0.32	1
T3	0	0.11	-0.3	0.49	-0.08	1
a4	0	0.56	0.49	0.52	-0.03	0.38	1
T4	0	0.15	0.13	0.26	-0.29	-0.09	0.03	1
a5	0	0.07	0.06	0.07	0.01	0.03	-0.05	0.14	1
T5	0	0.05	0.04	0.04	0	0.03	-0.07	0.06	0	1
a6	0	0.01	0.01	0.01	0	0	0	0.02	-0.01	0	1
T6	0	0.01	0.01	0.01	0	0	-0.01	0.02	0	0	0	1

Energy: 15.83 MeV

#	Half-life [s]	Relative abundance a(i)
1	59.0 ± 0.500	0.043 ± 0.001
2	21.7 ± 0.310	0.154 ± 0.004
3	5.93 ± 0.134	0.174 ± 0.005
4	2.14 ± 0.048	0.448 ± 0.009
5	0.582 ± 0.017	0.139 ± 0.004
6	0.215 ± 0.006	0.042 ± 0.001

Average Half-life : 7.94 ± 0.31 s

Correlation matrix

	a1	T1	a2	T2	a3	T3	a4	T4	a5	T5	a6	T6
a1	1
T1	0	1
a2	0	0.52	1
T2	0	0.1	-0.14	1
a3	0	0.19	0.04	0.34	1
T3	0	0.12	-0.28	0.35	-0.06	1
a4	0	0.37	0.34	0.4	-0.03	0.28	1
T4	0	0.16	0.09	0.3	-0.18	-0.01	-0.02	1
a5	0	0.05	0.04	0.05	0.01	0.03	-0.05	0.07	1
T5	0	0.04	0.03	0.04	0	0.03	-0.05	0.03	-0.01	1
a6	0	0.01	0	0.01	0	0	0	0.01	0	0	1
T6	0	0.01	0.01	0.01	0	0	-0.01	0.01	0	0	0	1

Energy: 16.76 MeV

#	Half-life [s]	Relative abundance a(i)
1	56.8 ± 0.334	0.048 ± 0.001
2	21.4 ± 0.226	0.159 ± 0.003
3	5.91 ± 0.094	0.169 ± 0.004
4	2.16 ± 0.035	0.428 ± 0.007
5	0.549 ± 0.015	0.148 ± 0.004
6	0.214 ± 0.006	0.047 ± 0.001

Average Half-life : 8.17 ± 0.25 s

Correlation matrix

	a1	T1	a2	T2	a3	T3	a4	T4	a5	T5	a6	T6
a1	1
T1	0	1
a2	0	0.71	1
T2	0	0.38	-0.01	1
a3	0	0.29	0.14	0.4	1
T3	0	0.16	-0.32	0.6	-0.13	1
a4	0	0.63	0.44	0.59	0	0.51	1
T4	0	0.15	0.14	0.18	-0.41	0.07	0.06	1
a5	0	0.11	0.08	0.1	0.01	0.04	-0.07	0.21	1
T5	0	0.06	0.04	0.06	0.01	0.05	-0.1	0.1	0	1
a6	0	0.01	0.01	0.01	0	0	0	0.03	-0.01	0	1
T6	0	0.02	0.01	0.01	0	0.01	-0.01	0.03	-0.01	0	0	1

Energy: 17.98 MeV

#	Half-life [s]	Relative abundance a(i)
1	57.5 ± 0.334	0.142 ± 0.001
2	21.9 ± 0.187	0.152 ± 0.003
3	5.82 ± 0.074	0.168 ± 0.003
4	2.16 ± 0.026	0.459 ± 0.006
5	0.589 ± 0.012	0.139 ± 0.003
6	0.218 ± 0.005	0.040 ± 0.001

Average Half-life : 7.79 ± 0.08 s

Correlation matrix

	a1	T1	a2	T2	a3	T3	a4	T4	a5	T5	a6	T6
a1	1
T1	0	1
a2	0	0.7	1
T2	0	0.27	-0.03	1
a3	0	0.24	0.13	0.37	1
T3	0	0.14	-0.3	0.57	-0.12	1
a4	0	0.59	0.48	0.55	-0.01	0.46	1
T4	0	0.15	0.15	0.19	-0.37	0.01	0.04	1
a5	0	0.09	0.08	0.08	0.01	0.04	-0.07	0.18	1
T5	0	0.05	0.04	0.05	0.01	0.04	-0.08	0.08	0	1
a6	0	0.01	0.01	0.01	0	0	0	0.02	-0.01	0	1
T6	0	0.01	0.01	0.01	0	0	-0.01	0.03	-0.01	0	0	1

232U

Energy: Thermal Spectrum

5-Groups
Original Model - R. W. WALDO, R. A. KARAM, R. A. MEYER, Delayed Neutron Yields: Time Dependent Measurements and a Predictive Model, Physical Review C, 23, No. 3, 1113 (March 1981).

#	Half-life [s]	Relative abundance a(i)
1	54.3 ± 0.170	0.120 ± 0.009
2	19.8 ± 0.160	0.300 ± 0.023
3	4.82 ± 0.200	0.306 ± 0.032
4	1.75 ± 0.200	0.258 ± 0.027
5	0.513 ± 0.150	0.016 ± 0.089

Average Half-life : 14.37 ± .70 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.110 ± 0.009
2	24.5	0.144 ± 0.015
3	16.3	0.178 ± 0.019
4	5.21	0.218 ± 0.033
5	2.37	0.270 ± 0.005
6	1.04	0.076 ± 0.048
7	0.424	0.005 ± 0.080

Average Half-life : 14.38 ± .71 s

233U

5-Groups
Original Model - A. CAHN, J. W. T. DABBS, and D. J. HUGHES, Delayed Neutrons from Fission of 23 (233U), Argonne Laboratory report CP-3147, Univ. of Chicago (October 2, 1945).

#	Half-life [s]	Relative abundance a(i)
1	55.6 ± 0.200	0.075 ± 0.021
2	22.0 ± 0.200	0.238 ± 0.002
3	4.51 ± 0.100	0.350 ± 0.021
4	1.52 ± 0.050	0.254 ± 0.021
5	0.430 ± 0.050	0.083 ± 0.024

Average Half-life : 11.40 ± 1.17 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.073 ± 0.021
2	24.5	0.168 ± 0.003
3	16.3	0.076 ± 0.002
4	5.21	0.236 ± 0.017
5	2.37	0.266 ± 0.021
6	1.04	0.108 ± 0.014
7	0.424	0.075 ± 0.023

Average Half-life : 11.40 ± 1.18 s

4-Groups
Original Model - S. V. GIRSHFELD, The Study of Delayed Neutrons Emitted by Uranium-233 as a Result of Irradiation by Thermal Neutrons, Proc. 1st International Conf. on the Peaceful Uses of Atomic Energy, United Nations, NY, Vol. IV, P/648, 171 (August 8-20, 1955).

#	Half-life [s]	Relative abundance a(i)
1	55.3 ± 0.900	0.0891 ± 0.008
2	22.2 ± 0.200	0.2868 ± 0.022
3	4.50 ± 0.040	0.3643 ± 0.036
4	1.50 ± 0.070	0.2598 ± 0.030

Average Half-life : 13.32 ± .68 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.090 ± 0.008
2	24.5	0.179 ± 0.018
3	16.3	0.129 ± 0.013
4	5.21	0.201 ± 0.030
5	2.37	0.317 ± 0.031
6	1.04	0.085 ± 0.018

Average Half-life : 13.34 ± .68 s

6-Groups
Original Model - G. R. KEEPIN, T. F. WIMETT, and R. K. ZEIGLER, Delayed Neutrons from Fissionable Isotopes of Uranium, Plutonium, and Thorium, Physical Review, 107, 4, 1044 (Aug. 15, 1957). Keepin G.R., Wimett T.F. and Zeigler RK. (1957), Delayed Neutrons from Fissionable Isotopes of Uranium, Plutonium and Thorium. J. Nuclear Energy 6, 1.

#	Half-life [s]	Relative abundance a(i)
1	55.0 ± 0.540	0.0860 ± 0.003
2	20.6 ± 0.380	0.2990 ± 0.004
3	5.00 ± 0.210	0.2520 ± 0.040
4	2.13 ± 0.200	0.2780 ± 0.020
5	0.615 ± 0.240	0.0510 ± 0.024
6	0.277 ± 0.047	0.0340 ± 0.014

Average Half-life : 12.78 ± .31 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.080 ± 0.004
2	24.5	0.167 ± 0.004
3	16.3	0.150 ± 0.003
4	5.21	0.200 ± 0.040
5	2.37	0.298 ± 0.022
6	1.04	0.039 ± 0.001
7	0.424	0.056 ± 0.025
8	0.195	0.011 ± 0.0002

Average Half-life : 12.78 ± .31 s

5-Groups
Original Model - G. E. RAMBO, Delayed Neutron Groups from 235U and 233U and Short-Lived Delayed Photoneutrons Groups from 235U and 233U in D20, Dissertation, Virginia Polytechnic Institute, Blacksburg, VPI (May 1969).

#	Half-life [s]	Relative abundance a(i)
1	53.5 ± 37.0	0.0761 ± 0.18
2	22.6 ± 1.100	0.2723 ± 0.05
3	6.13 ± 0.060	0.2863 ± 0.03
4	2.07 ± 0.070	0.3063 ± 0.04
5	0.326 ± 0.035	0.0590 ± 0.02

Average Half-life : 12.63 ± 10.09 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.071 ± 0.180
2	24.5	0.185 ± 0.004
3	16.3	0.137 ± 0.035
4	5.21	0.242 ± 0.057
5	2.37	0.267 ± 0.005
6	1.04	0.040 ± 0.001
7	0.424	0.043 ± 0.025
8	0.195	0.016 ± 0.0003

Average Half-life : 12.65 ± 10.03 s

5-Groups
Original Model - R. J. ONEGA, G. E. RAMBO, M. HUIZINGA, and A. ROBESON, Delayed-Neutron Half-Lives for 233U, 235U, and 239Pu, Trans. Am. Nucl. Soc., 12, 1, 289 (June 5-19, 1969).

#	Half-life [s]	Relative abundance a(i)
1	53.5 ± 37.0	0.069 ± 0.160
2	22.6 ± 1.100	0.254 ± 0.043
3	6.13 ± 0.060	0.315 ± 0.038
4	2.09 ± 0.070	0.300 ± 0.044
5	0.332 ± 0.036	0.061 ± 0.016

Average Half-life : 12.02 ± 8.99 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.065 ± 0.160
2	24.5	0.167 ± 0.003
3	16.3	0.138 ± 0.032
4	5.21	0.275 ± 0.060
5	2.37	0.256 ± 0.005
6	1.04	0.038 ± 0.001
7	0.424	0.046 ± 0.026
8	0.195	0.015 ± 0.000

Average Half-life : 12.04 ± 8.92 s

6-Groups
Original Model - R. W. WALDO, R. A. KARAM, R. A. MEYER, Delayed Neutron Yields: Time Dependent Measurements and a Predictive Model, Physical Review C, 23, No. 3, 1113 (March 1981).

#	Half-life [s]	Relative abundance a(i)
1	55.9 ± 0.180	0.075 ± 0.005
2	26.8 ± 2.000	0.096 ± 0.037
3	17.4 ± 1.100	0.219 ± 0.033
4	4.31 ± 0.270	0.239 ± 0.033
5	2.42 ± 0.240	0.257 ± 0.041
6	0.525 ± 0.160	0.115 ± 0.018

Average Half-life : 12.29 ± 1.24 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.071 ± 0.007
2	24.5	0.200 ± 0.046
3	16.3	0.085 ± 0.011
4	5.21	0.261 ± 0.037
5	2.37	0.244 ± 0.041
6	1.04	0.068 ± 0.011
7	0.424	0.072 ± 0.009

Average Half-life : 12.26 ± 1.23 s

Energy: Thermal Spectrum 6-groups

6-Groups
Original Model - V. M. Piksaikin, L. E. Kazakov et al.,RELATIVE YIELD AND PERIOD OF INDIVIDUAL GROUPS OF DELAYED NEUTRONS IN 233U, 235U AND 239Pu FISSION BY EPITHERMAL NEUTRONS, Atomic Energy, Vol. 92, No. 2, 2002. (in English) V.M. Piksaikin et al., Relative abundances and periods of delayed neutrons from fission of U-233, U235 and Pu-239 by epithermal neutrons, Atomic energy, 2002, N0.2, pp.135-142. (in Russian) V.M. Piksaikin, A.S. Egorov, K.V. Mitrofanov. THE ABSOLUTE TOTAL DELAYED NEUTRON YIELDS, RELATIVE ABUNDANCES AND HALF-LIVES OF DELAYED NEUTRON GROUPS FROM NEUTRON INDUCED FISSION OF 232Th, 233U, 236U, 239Pu AND 241Am. INDC(NDS) - 0646, 2013

#	Half-life [s]	Relative abundance a(i)
1	54.64 ± 0.19	0.085 ± 0.001
2	20.77 ± 0.13	0.291 ± 0.004
3	5.25 ± 0.05	0.254 ± 0.004
4	2.14 ± 0.03	0.285 ± 0.003
5	0.611 ± 0.013	0.051 ± 0.001
6	0.276 ± 0.006	0.034 ± 0.001

Average Half-life : 12.69 ± 0.11 s

Correlation matrix

	a1	T1	a2	T2	a3	T3	a4	T4	a5	T5	a6	T6
a1	1
T1	0	1
a2	0	0.85	1
T2	0	0.65	0.35	1
a3	0	0.5	0.39	0.52	1
T3	0	0.21	-0.18	0.62	-0.1	1
a4	0	0.51	0.33	0.56	-0.22	0.65	1
T4	0	0.04	0.11	-0.02	-0.5	-0.05	0.16	1
a5	0	0.05	0.04	0.05	-0.01	0.03	-0.05	0.12	1
T5	0	0.03	0.02	0.04	0	0.04	-0.05	0.05	0	1
a6	0	0.02	0.02	0.01	0	0.01	-0.01	0.05	-0.01	0	1
T6	0	0.02	0.01	0.02	0	0.01	-0.02	0.05	-0.01	0	0	1

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.078 ± 0.003
2	24.5	0.164 ± 0.006
3	16.3	0.15 ± 0.005
4	5.21	0.209 ± 0.008
5	2.37	0.287 ± 0.009
6	1.04	0.046 ± 0.002
7	0.424	0.048 ± 0.002
8	0.195	0.0173 ± 0.0009

Average Half-life : 12.65 ± 0.23 s

Energy: Fast Neutrons

#	Half-life [s]	Relative abundance a(i)
1	55.6 ± 0.000	0.080 ± 0.003
2	22.0 ± 0.000	0.283 ± 0.023
3	4.51 ± 0.000	0.383 ± 0.023
4	1.52 ± 0.000	0.221 ± 0.022
5	0.430 ± 0.000	0.033 ± 0.015

Average Half-life : 12.75 ± .54 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.076 ± 0.003
2	24.5	0.208 ± 0.019
3	16.3	0.079 ± 0.014
4	5.21	0.272 ± 0.017
5	2.37	0.249 ± 0.023
6	1.04	0.088 ± 0.014
7	0.424	0.027 ± 0.015

Average Half-life : 12.75 ± .55 s

Energy: Fast Spectrum

#	Half-life [s]	Relative abundance a(i)
1	55.1 ± 1.900	0.086 ± 0.003
2	20.7 ± 0.860	0.274 ± 0.005
3	5.30 ± 0.190	0.227 ± 0.035
4	2.29 ± 0.010	0.317 ± 0.011
5	0.546 ± 0.110	0.073 ± 0.014
6	0.221 ± 0.042	0.023 ± 0.007

Average Half-life : 12.38 ± .40 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.080 ± 0.006
2	24.5	0.157 ± 0.003
3	16.3	0.135 ± 0.003
4	5.21	0.209 ± 0.034
5	2.37	0.308 ± 0.014
6	1.04	0.037 ± 0.001
7	0.424	0.062 ± 0.013
8	0.195	0.013 ± 0.005

Average Half-life : 12.38 ± .39 s

5-Groups
Original Model - G. BENEDETTI, A. CESANA, V. SANGIUST, and M. TERRANI, Delayed Neutron Yields from Fission of Uranium-233, Neptunium-237, Plutonium-238, -240, -241, and Americium-241�, Nucl. Sci. Eng., 80, 379 (1982).

#	Half-life [s]	Relative abundance a(i)
1	54.2 ± 0.850	0.093 ± 0.007
2	19.5 ± 0.980	0.286 ± 0.028
3	4.85 ± 0.410	0.241 ± 0.014
4	2.15 ± 0.200	0.273 ± 0.016
5	0.497 ± 0.230	0.107 ± 0.034

Average Half-life : 12.44 ± .73 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.081 ± 0.007
2	24.5	0.157 ± 0.020
3	16.3	0.137 ± 0.022
4	5.21	0.225 ± 0.011
5	2.37	0.254 ± 0.023
6	1.04	0.074 ± 0.016
7	0.424	0.073 ± 0.024

Average Half-life : 12.42 ± .73 s

Energy: Fission Spectrum

6-Groups
Original Model - A. N. GUDKOV et al., Measurement of the Delayed-Neutron Yields in the Fission of 233U, 236U, 237Np, 240Pu, and 241Pu by Neutrons from the Spectrum of a Fast Reactor, At. Energ., 66, No. 2, 100 (1989).

#	Half-life [s]	Relative abundance a(i)
1	55.0 ± 0.000	0.086 ± 0.006
2	20.8 ± 0.000	0.277 ± 0.020
3	5.29 ± 0.000	0.232 ± 0.019
4	2.30 ± 0.000	0.300 ± 0.028
5	0.546 ± 0.000	0.081 ± 0.060
6	0.221 ± 0.000	0.023 ± 0.010

Average Half-life : 12.44 ± .54 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.079 ± 0.005
2	24.5	0.165 ± 0.015
3	16.3	0.129 ± 0.013
4	5.21	0.218 ± 0.023
5	2.37	0.289 ± 0.010
6	1.04	0.039 ± 0.042
7	0.424	0.068 ± 0.050
8	0.195	0.012 ± 0.000

Average Half-life : 12.44 ± .53 s

Energy: 0.34MeV

#	Half-life [s]	Relative abundance a(i)
1	54.6 ± 0.317	0.085 ± 0.002
2	21.1 ± 0.188	0.280 ± 0.005
3	5.58 ± 0.087	0.230 ± 0.005
4	2.40 ± 0.050	0.310 ± 0.006
5	0.543 ± 0.016	0.072 ± 0.002
6	0.221 ± 0.006	0.023 ± 0.001

Average Half-life : 12.64 ± 0.16 s

Correlation matrix

	a1	T1	a2	T2	a3	T3	a4	T4	a5	T5	a6	T6
a1	1
T1	0	1
a2	0	0.81	1
T2	0	0.36	0.13	1
a3	0	0.38	0.25	0.51	1
T3	0	0.05	-0.31	0.53	-0.03	1
a4	0	0.5	0.39	0.48	-0.12	0.43	1
T4	0	0.14	0.15	0.17	-0.27	-0.08	0.07	1
a5	0	0.05	0.03	0.04	0	0.03	-0.04	0.07	1
T5	0	0.04	0.03	0.04	0	0.04	-0.04	0.04	0	1
a6	0	0	0	0	0	0	0	0.01	0	0	1
T6	0	0.01	0	0.01	0	0	-0.01	0.01	0	0	0	1

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.078 ± 0.003
2	24.5	0.169 ± 0.006
3	16.3	0.135 ± 0.005
4	5.21	0.224 ± 0.008
5	2.37	0.296 ± 0.009
6	1.04	0.018 ± 0.001
7	0.424	0.070 ± 0.003
8	0.195	0.010 ± 0.001

Average Half-life : 12.62 ± .23 s

Energy: 0.59MeV

#	Half-life [s]	Relative abundance a(i)
1	54.6 ± 0.385	0.086 ± 0.002
2	20.9 ± 0.228	0.275 ± 0.006
3	5.66 ± 0.104	0.233 ± 0.006
4	2.31 ± 0.058	0.310 ± 0.007
5	0.539 ± 0.019	0.074 ± 0.003
6	0.221 ± 0.008	0.023 ± 0.001

Average Half-life : 12.50 ± 0.20 s

Correlation matrix

	a1	T1	a2	T2	a3	T3	a4	T4	a5	T5	a6	T6
a1	1
T1	0	1
a2	0	0.8	1
T2	0	0.38	0.13	1
a3	0	0.39	0.26	0.52	1
T3	0	0.06	-0.32	0.54	-0.03	1
a4	0	0.49	0.39	0.5	-0.11	0.45	1
T4	0	0.14	0.15	0.16	-0.3	-0.05	0.09	1
a5	0	0.05	0.04	0.04	0.01	0.03	-0.04	0.09	1
T5	0	0.04	0.03	0.04	0	0.04	-0.04	0.05	0	1
a6	0	0.01	0.01	0	0	0	0	0.01	0	0	1
T6	0	0.01	0.01	0.01	0	0	-0.01	0.02	0	0	0	1

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.079 ± 0.003
2	24.5	0.159 ± 0.006
3	16.3	0.143 ± 0.005
4	5.21	0.219 ± 0.008
5	2.37	0.291 ± 0.009
6	1.04	0.026 ± 0.001
7	0.424	0.073 ± 0.004
8	0.195	0.009 ± 0.001

Average Half-life : 12.52 ± .23 s

Energy: 0.81MeV

#	Half-life [s]	Relative abundance a(i)
1	54.8 ± 0.337	0.086 ± 0.002
2	21.1 ± 0.191	0.272 ± 0.005
3	5.62 ± 0.087	0.234 ± 0.005
4	2.27 ± 0.048	0.311 ± 0.006
5	0.542 ± 0.016	0.074 ± 0.002
6	0.222 ± 0.006	0.023 ± 0.001

Average Half-life : 12.53 ± 0.16 s

Correlation matrix

	a1	T1	a2	T2	a3	T3	a4	T4	a5	T5	a6	T6
a1	1
T1	0	1
a2	0	0.8	1
T2	0	0.33	0.12	1
a3	0	0.37	0.26	0.51	1
T3	0	0.05	-0.31	0.52	-0.02	1
a4	0	0.48	0.39	0.47	-0.11	0.42	1
T4	0	0.15	0.16	0.17	-0.27	-0.09	0.06	1
a5	0	0.04	0.03	0.04	0	0.03	-0.03	0.07	1
T5	0	0.04	0.03	0.04	0	0.04	-0.04	0.05	0	1
a6	0	0	0	0	0	0	0	0.01	0	0	1
T6	0	0.01	0.01	0.01	0	0	-0.01	0.01	0	0	0	1

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.081 ± 0.003
2	24.5	0.159 ± 0.006
3	16.3	0.139 ± 0.005
4	5.21	0.214 ± 0.008
5	2.37	0.293 ± 0.009
6	1.04	0.034 ± 0.002
7	0.424	0.071 ± 0.004
8	0.195	0.009 ± 0.001

Average Half-life : 12.52 ± .23 s

Energy: 1.01MeV

#	Half-life [s]	Relative abundance a(i)
1	54.7 ± 0.384	0.086 ± 0.002
2	20.9 ± 0.226	0.270 ± 0.006
3	5.43 ± 0.101	0.231 ± 0.006
4	2.25 ± 0.057	0.317 ± 0.007
5	0.543 ± 0.019	0.073 ± 0.003
6	0.222 ± 0.008	0.023 ± 0.001

Average Half-life : 12.33 ± 0.19 s

Correlation matrix

	a1	T1	a2	T2	a3	T3	a4	T4	a5	T5	a6	T6
a1	1
T1	0	1
a2	0	0.81	1
T2	0	0.41	0.16	1
a3	0	0.38	0.25	0.5	1
T3	0	0.09	-0.29	0.55	-0.02	1
a4	0	0.51	0.41	0.51	-0.13	0.46	1
T4	0	0.15	0.16	0.16	-0.29	-0.1	0.08	1
a5	0	0.04	0.03	0.04	0	0.03	-0.04	0.08	1
T5	0	0.04	0.03	0.04	0	0.04	-0.05	0.05	0	1
a6	0	0.01	0.01	0.01	0	0	0	0.01	0	0	1
T6	0	0.01	0.01	0.01	0	0	-0.01	0.02	0	0	0	1

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.079 ± 0.003
2	24.5	0.155 ± 0.006
3	16.3	0.139 ± 0.005
4	5.21	0.205 ± 0.007
5	2.37	0.310 ± 0.009
6	1.04	0.035 ± 0.002
7	0.424	0.068 ± 0.003
8	0.195	0.009 ± 0.0004

Average Half-life : 12.37 ± .23 s

Energy: 3.23MeV

#	Half-life [s]	Relative abundance a(i)
1	56.5 ± 0.828	0.086 ± 0.002
2	21.0 ± 0.289	0.265 ± 0.007
3	5.33 ± 0.123	0.233 ± 0.006
4	2.38 ± 0.060	0.320 ± 0.008
5	0.546 ± 0.016	0.073 ± 0.002
6	0.221 ± 0.006	0.023 ± 0.001

Average Half-life : 12.48 ± 0.22 s

Correlation matrix

	a1	T1	a2	T2	a3	T3	a4	T4	a5	T5	a6	T6
a1	1
T1	0	1
a2	0	0.49	1
T2	0	-0.19	-0.12	1
a3	0	0.13	0.11	0.41	1
T3	0	0.05	-0.23	0.3	0.01	1
a4	0	0.14	0.24	0.31	-0.09	0.18	1
T4	0	0.05	0.06	0.25	-0.1	-0.04	-0.01	1
a5	0	0.01	0.02	0.02	0	0.02	-0.02	0.02	1
T5	0	0.01	0.02	0.02	0	0.02	-0.02	0.01	0	1
a6	0	0	0	0	0	0	0	0	0	0	1
T6	0	0	0	0	0	0	0	0	0	0	0	1

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.088 ± 0.003
2	24.5	0.127 ± 0.005
3	16.3	0.139 ± 0.005
4	5.21	0.199 ± 0.007
5	2.37	0.330 ± 0.010
6	1.04	0.019 ± 0.001
7	0.424	0.064 ± 0.003
8	0.195	0.010 ± 0.001

Average Half-life : 12.48 ± .25 s

Energy: 3.75MeV

#	Half-life [s]	Relative abundance a(i)
1	55.31 ± 0.459	0.087 ± 0.002
2	21.15 ± 0.250	0.235 ± 0.006
3	5.78 ± 0.091	0.246 ± 0.006
4	2.18 ± 0.050	0.335 ± 0.007
5	0.559 ± 0.020	0.075 ± 0.003
6	0.222 ± 0.008	0.023 ± 0.001

Average Half-life : 11.96 ± 0.19 s

Correlation matrix

	a1	T1	a2	T2	a3	T3	a4	T4	a5	T5	a6	T6
a1	1
T1	0	1
a2	0	0.82	1
T2	0	0.4	0.15	1
a3	0	0.39	0.28	0.5	1
T3	0	0.06	-0.31	0.58	-0.07	1
a4	0	0.53	0.4	0.54	-0.11	0.52	1
T4	0	0.12	0.16	0.11	-0.37	-0.06	0.11	1
a5	0	0.06	0.05	0.05	0	0.03	-0.04	0.1	1
T5	0	0.04	0.03	0.04	0	0.04	-0.05	0.06	0	1
a6	0	0.01	0.01	0.01	0	0	0	0.01	0	0	1
T6	0	0.01	0.01	0.01	0	0	-0.01	0.02	0	0	0	1

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.084 ± 0.003
2	24.5	0.128 ± 0.005
3	16.3	0.135 ± 0.005
4	5.21	0.223 ± 0.008
5	2.37	0.298 ± 0.009
6	1.04	0.057 ± 0.003
7	0.424	0.066 ± 0.003
8	0.195	0.009 ± 0.0004

Average Half-life : 11.98 ± .23 s

Energy: 4.20MeV

#	Half-life [s]	Relative abundance a(i)
1	57.4 ± 0.866	0.087 ± 0.001
2	20.2 ± 0.285	0.256 ± 0.005
3	5.16 ± 0.098	0.233 ± 0.006
4	2.48 ± 0.063	0.329 ± 0.007
5	0.550 ± 0.019	0.072 ± 0.003
6	0.220 ± 0.008	0.023 ± 0.001

Average Half-life : 12.24 ± 0.17 s

Correlation matrix

	a1	T1	a2	T2	a3	T3	a4	T4	a5	T5	a6	T6
a1	1
T1	0	1
a2	0	0.75	1
T2	0	0.23	0	1
a3	0	0.29	0.18	0.43	1
T3	0	-0.03	-0.41	0.45	-0.09	1
a4	0	0.41	0.33	0.4	-0.23	0.35	1
T4	0	0.12	0.13	0.18	-0.26	-0.18	0.04	1
a5	0	0.03	0.02	0.03	-0.01	0.02	-0.05	0.06	1
T5	0	0.03	0.02	0.03	0	0.03	-0.05	0.04	-0.01	1
a6	0	0	0	0	0	0	0	0	0	0	1
T6	0	0	0.01	0	0	0	-0.01	0.01	0	0	0	1

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.093 ± 0.004
2	24.5	0.085 ± 0.004
3	16.3	0.188 ± 0.005
4	5.21	0.196 ± 0.007
5	2.37	0.357 ± 0.010
6	1.04	0.013 ± 0.001
7	0.424	0.050 ± 0.003
8	0.195	0.012 ± 0.001

Average Half-life : 12.24 ± .27 s

Energy: 4.72MeV

#	Half-life [s]	Relative abundance a(i)
1	56.7 ± 0.896	0.086 ± 0.003
2	21.1 ± 0.328	0.255 ± 0.007
3	5.13 ± 0.136	0.236 ± 0.007
4	2.47 ± 0.073	0.327 ± 0.009
5	0.546 ± 0.019	0.073 ± 0.003
6	0.221 ± 0.008	0.023 ± 0.001

Average Half-life : 12.33 ± 0.25 s

Correlation matrix

	a1	T1	a2	T2	a3	T3	a4	T4	a5	T5	a6	T6
a1	1
T1	0	1
a2	0	0.56	1
T2	0	-0.13	-0.09	1
a3	0	0.15	0.14	0.43	1
T3	0	0.04	-0.27	0.36	0	1
a4	0	0.2	0.29	0.35	-0.11	0.23	1
T4	0	0.06	0.08	0.26	-0.13	-0.07	0	1
a5	0	0.02	0.02	0.02	0	0.02	-0.03	0.03	1
T5	0	0.02	0.02	0.02	0	0.02	-0.03	0.02	0	1
a6	0	0	0	0	0	0	0	0	0	0	1
T6	0	0	0	0	0	0	0	0.01	0	0	0	1

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.090 ± 0.004
2	24.5	0.122 ± 0.005
3	16.3	0.149 ± 0.005
4	5.21	0.202 ± 0.008
5	2.37	0.356 ± 0.010
6	1.04	0.012 ± 0.001
7	0.424	0.056 ± 0.003
8	0.195	0.012 ± 0.001

Average Half-life : 12.39 ± .25 s

Energy: 5.6 MeV

5-Groups
Original Model - B. P. MAKSYUTENKO, Delayed Neutrons from Uranium Isotopes, Thorium-232 and Plutonium-239, Proc. of a Panel on Delayed Fission Neutrons, Int. Atomic Energy Agency, Vienna, 191 (April 24-27, 1967).

#	Half-life [s]	Relative abundance a(i)
1	55.0 ± 0.000	0.086 ± 0.009
2	24.0 ± 0.000	0.116 ± 0.004
3	15.5 ± 0.000	0.151 ± 0.007
4	5.20 ± 0.000	0.159 ± 0.010
5	2.20 ± 0.000	0.488 ± 0.013

Average Half-life : 11.77 ± .50 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.088 ± 0.008
2	24.5	0.071 ± 0.005
3	16.3	0.209 ± 0.007
4	5.21	0.099 ± 0.010
5	2.37	0.518 ± 0.013
6	1.04	0.015 ± 0.003

Average Half-life : 11.79 ± .50 s

Energy: 6.0 MeV

#	Half-life [s]	Relative abundance a(i)
1	55.0 ± 0.000	0.095 ± 0.010
2	24.0 ± 0.000	0.133 ± 0.005
3	15.5 ± 0.000	0.151 ± 0.008
4	5.20 ± 0.000	0.222 ± 0.014
5	2.20 ± 0.000	0.399 ± 0.034

Average Half-life : 12.77 ± .56 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.095 ± 0.009
2	24.5	0.093 ± 0.005
3	16.3	0.202 ± 0.008
4	5.21	0.174 ± 0.012
5	2.37	0.423 ± 0.034
6	1.04	0.012 ± 0.008

Average Half-life : 12.79 ± .56 s

Energy: 6.2 MeV

#	Half-life [s]	Relative abundance a(i)
1	55.0 ± 0.000	0.091 ± 0.009
2	24.0 ± 0.000	0.113 ± 0.006
3	15.5 ± 0.000	0.154 ± 0.010
4	5.20 ± 0.000	0.190 ± 0.016
5	2.20 ± 0.000	0.452 ± 0.034

Average Half-life : 12.08 ± .56 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.092 ± 0.009
2	24.5	0.070 ± 0.006
3	16.3	0.209 ± 0.011
4	5.21	0.135 ± 0.014
5	2.37	0.480 ± 0.034
6	1.04	0.014 ± 0.008

Average Half-life : 12.09 ± .56 s

Energy: 6.4 MeV

#	Half-life [s]	Relative abundance a(i)
1	55.0 ± 0.000	0.091 ± 0.009
2	24.0 ± 0.000	0.104 ± 0.005
3	15.5 ± 0.000	0.163 ± 0.008
4	5.20 ± 0.000	0.144 ± 0.013
5	2.20 ± 0.000	0.499 ± 0.025

Average Half-life : 11.86 ± .54 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.093 ± 0.009
2	24.5	0.057 ± 0.005
3	16.3	0.222 ± 0.008
4	5.21	0.084 ± 0.012
5	2.37	0.530 ± 0.025
6	1.04	0.015 ± 0.006

Average Half-life : 11.87 ± .53 s

Energy: 6.8 MeV

#	Half-life [s]	Relative abundance a(i)
1	55.0 ± 0.000	0.098 ± 0.010
2	24.0 ± 0.000	0.115 ± 0.005
3	15.5 ± 0.000	0.166 ± 0.008
4	5.20 ± 0.000	0.215 ± 0.013
5	2.20 ± 0.000	0.406 ± 0.026

Average Half-life : 12.73 ± .57 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.099 ± 0.010
2	24.5	0.074 ± 0.005
3	16.3	0.217 ± 0.008
4	5.21	0.167 ± 0.012
5	2.37	0.431 ± 0.026
6	1.04	0.012 ± 0.006

Average Half-life : 12.75 ± .57 s

Energy: 7.25 MeV

#	Half-life [s]	Relative abundance a(i)
1	55.0 ± 0.000	0.100 ± 0.010
2	24.0 ± 0.000	0.151 ± 0.005
3	15.5 ± 0.000	0.157 ± 0.007
4	5.20 ± 0.000	0.275 ± 0.016
5	2.20 ± 0.000	0.318 ± 0.011

Average Half-life : 13.68 ± .58 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.100 ± 0.010
2	24.5	0.114 ± 0.006
3	16.3	0.201 ± 0.006
4	5.21	0.238 ± 0.016
5	2.37	0.337 ± 0.011
6	1.04	0.010 ± 0.003

Average Half-life : 13.69 ± .58 s

Energy: 14.7 MeV

6-Groups
Original Model - L. V. EAST, R. H. AUGUSTON, and H. O. MENLOVE, Delayed Neutron Abundances and Half-Lives for 14.7-MeV Fission, excerpt from Los Alamos National Laboratory Program Status Report LA-4605-MS (September-December, 1970), p. 15. L. V. EAST, R. H. AUGUSTSON, H. O. MENLOVE, and C. F. MASTERS, Delayed- Neutron Abundances and Half-Lives from 14.7-MeV Fission, Trans Amer. Nucl. Soc., 13, 760 (November, 1970).

#	Half-life [s]	Relative abundance a(i)
1	55.6 ± 0.400	0.095 ± 0.002
2	19.3 ± 0.200	0.208 ± 0.002
3	5.04 ± 0.200	0.242 ± 0.016
4	2.18 ± 0.080	0.327 ± 0.014
5	0.570 ± 0.030	0.087 ± 0.004
6	0.221 ± 0.000	0.041 ± 0.003

Average Half-life : 11.29 ± .17 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.093 ± 0.002
2	24.5	0.078 ± 0.002
3	16.3	0.140 ± 0.003
4	5.21	0.204 ± 0.018
5	2.37	0.330 ± 0.008
6	1.04	0.058 ± 0.009
7	0.424	0.072 ± 0.001
8	0.195	0.026 ± 0.002

Average Half-life : 11.28 ± .17 s

Energy: 15 MeV

5-Groups
Original Model - B. P. MAKSYUTENKO, Delayed Neutrons from Fission of 233U by 15-MeV Neutrons, Iadernaia Fizika (English Translation), 15, No. 4, 1042 (August 1, 1963).

#	Half-life [s]	Relative abundance a(i)
1	55.0 ± 0.000	0.078 ± 0.001
2	24.0 ± 0.000	0.060 ± 0.003
3	15.5 ± 0.000	0.146 ± 0.023
4	5.20 ± 0.000	0.093 ± 0.029
5	2.20 ± 0.000	0.623 ± 0.081

Average Half-life : 9.83 ± .43 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.080 ± 0.002
2	24.5	0.011 ± 0.000
3	16.3	0.212 ± 0.022
4	5.21	0.018 ± 0.031
5	2.37	0.661 ± 0.076
6	1.04	0.019 ± 0.028

Average Half-life : 9.85 ± .44 s

Energy: 18 MeV

11-Groups
Original Model - B. P. MAKSYUTENKO, R. RAMAZANOV, and M. Z. TARASKO, Variation of Fragment Yield Ratios of Delayed Neutron Precursors in Fission of 239Pu and 233U by 18-21 MeV Neutrons, Sov. J. Nucl. Phys., 13, No. 2, 163 (August, 1971).

#	Half-life [s]	Relative abundance a(i)
1	55.7 ± 0.000	0.083 ± 0.008
2	24.4 ± 0.000	0.117 ± 0.003
3	15.9 ± 0.000	0.032 ± 0.008
4	11.3 ± 0.000	0.095 ± 0.005
5	6.05 ± 0.000	0.071 ± 0.003
6	4.45 ± 0.000	0.085 ± 0.012
7	2.67 ± 0.000	0.165 ± 0.015
8	2.02 ± 0.000	0.130 ± 0.023
9	1.70 ± 0.000	0.093 ± 0.032
10	1.60 ± 0.000	0.080 ± 0.013
11	1.30 ± 0.000	0.048 ± 0.023

Average Half-life : 10.92 ± .50 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.094 ± 0.008
2	24.5	0.003 ± 0.000
3	16.3	0.243 ± 0.009
4	5.21	0.077 ± 0.002
5	2.37	0.508 ± 0.042
6	1.04	0.075 ± 0.031

Average Half-life : 10.95 ± .50 s

Energy: 18.2 MeV

#	Half-life [s]	Relative abundance a(i)
1	55.7 ± 0.000	0.066 ± 0.007
2	24.4 ± 0.000	0.0002 ± 0.00002
3	15.9 ± 0.000	0.159 ± 0.004
4	11.3 ± 0.000	0.002 ± 0.0002
5	6.05 ± 0.000	0.0003 ± 0.00003
6	4.45 ± 0.000	0.003 ± 0.0003
7	2.67 ± 0.000	0.175 ± 0.017
8	2.02 ± 0.000	0.325 ± 0.032
9	1.70 ± 0.000	0.158 ± 0.030
10	1.60 ± 0.000	0.100 ± 0.044
11	1.30 ± 0.000	0.013 ± 0.001

Average Half-life : 7.81 ± .39 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.070 ± 0.007
2	24.5	0.007 ± 0.0001
3	16.3	0.129 ± 0.003
4	5.21	0.007 ± 0.000
5	2.37	0.658 ± 0.049
6	1.04	0.129 ± 0.044

Average Half-life : 7.89 ± .39 s

Energy: 18.5 MeV

#	Half-life [s]	Relative abundance a(i)
1	55.7 ± 0.000	0.074 ± 0.007
2	24.4 ± 0.000	0.131 ± 0.002
3	15.9 ± 0.000	0.009 ± 0.003
4	11.3 ± 0.000	0.053 ± 0.002
5	6.05 ± 0.000	0.187 ± 0.005
6	4.45 ± 0.000	0.063 ± 0.004
7	2.67 ± 0.000	0.060 ± 0.006
8	2.02 ± 0.000	0.116 ± 0.018
9	1.70 ± 0.000	0.126 ± 0.021
10	1.60 ± 0.000	0.117 ± 0.025
11	1.30 ± 0.000	0.064 ± 0.015

Average Half-life : 10.34 ± .43 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.0856 ± 0.008
2	24.5	0.0086 ± 0.0002
3	16.3	0.2218 ± 0.003
4	5.21	0.1077 ± 0.002
5	2.37	0.4700 ± 0.031
6	1.04	0.1063 ± 0.028

Average Half-life : 10.37 ± .43 s

Energy: 18.8 MeV

#	Half-life [s]	Relative abundance a(i)
1	55.7 ± 0.000	0.065 ± 0.006
2	24.4 ± 0.000	0.065 ± 0.003
3	15.9 ± 0.000	0.117 ± 0.003
4	11.3 ± 0.000	0.027 ± 0.002
5	6.05 ± 0.000	0.015 ± 0.006
6	4.45 ± 0.000	0.046 ± 0.003
7	2.67 ± 0.000	0.192 ± 0.008
8	2.02 ± 0.000	0.193 ± 0.012
9	1.70 ± 0.000	0.133 ± 0.016
10	1.60 ± 0.000	0.108 ± 0.021
11	1.30 ± 0.000	0.041 ± 0.015

Average Half-life : 8.99 ± .37 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.074 ± 0.007
2	24.5	0.007 ± 0.0002
3	16.3	0.195 ± 0.004
4	5.21	0.007 ± 0.0002
5	2.37	0.607 ± 0.026
6	1.04	0.109 ± 0.023

Average Half-life : 9.07 ± .37 s

Energy: 19.0 MeV

#	Half-life [s]	Relative abundance a(i)
1	55.7 ± 0.000	0.064 ± 0.006
2	24.4 ± 0.000	0.078 ± 0.003
3	15.9 ± 0.000	0.087 ± 0.003
4	11.3 ± 0.000	0.043 ± 0.006
5	6.05 ± 0.000	0.039 ± 0.008
6	4.45 ± 0.000	0.033 ± 0.010
7	2.67 ± 0.000	0.086 ± 0.008
8	2.02 ± 0.000	0.195 ± 0.006
9	1.70 ± 0.000	0.182 ± 0.007
10	1.60 ± 0.000	0.152 ± 0.008
11	1.30 ± 0.000	0.042 ± 0.017

Average Half-life : 8.93 ± .38 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.076 ± 0.006
2	24.5	0.008 ± 0.000
3	16.3	0.189 ± 0.006
4	5.21	0.008 ± 0.012
5	2.37	0.570 ± 0.017
6	1.04	0.150 ± 0.016

Average Half-life : 9.05 ± .38 s

Energy: 19.5 MeV

#	Half-life [s]	Relative abundance a(i)
1	55.7 ± 0.000	0.086 ± 0.009
2	24.4 ± 0.000	0.083 ± 0.003
3	15.9 ± 0.000	0.193 ± 0.002
4	11.3 ± 0.000	0.022 ± 0.007
5	6.05 ± 0.000	0.009 ± 0.001
6	4.45 ± 0.000	0.054 ± 0.008
7	2.67 ± 0.000	0.232 ± 0.004
8	2.02 ± 0.000	0.138 ± 0.007
9	1.70 ± 0.000	0.080 ± 0.004
10	1.60 ± 0.000	0.066 ± 0.004
11	1.30 ± 0.000	0.036 ± 0.016

Average Half-life : 11.63 ± .49 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.091 ± 0.009
2	24.5	0.034 ± 0.001
3	16.3	0.268 ± 0.006
4	5.21	0.009 ± 0.007
5	2.37	0.537 ± 0.014
6	1.04	0.061 ± 0.014

Average Half-life : 11.64 ± .49 s

Energy: 20.0 MeV

#	Half-life [s]	Relative abundance a(i)
1	55.7 ± 0.000	0.057 ± 0.006
2	24.4 ± 0.000	0.130 ± 0.001
3	15.9 ± 0.000	0.018 ± 0.001
4	11.3 ± 0.000	0.062 ± 0.002
5	6.05 ± 0.000	0.077 ± 0.003
6	4.45 ± 0.000	0.043 ± 0.002
7	2.67 ± 0.000	0.090 ± 0.006
8	2.02 ± 0.000	0.170 ± 0.007
9	1.70 ± 0.000	0.159 ± 0.007
10	1.60 ± 0.000	0.139 ± 0.010
11	1.30 ± 0.000	0.056 ± 0.007

Average Half-life : 9.13 ± .32 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.073 ± 0.006
2	24.5	0.007 ± 0.0002
3	16.3	0.212 ± 0.002
4	5.21	0.007 ± 0.0002
5	2.37	0.569 ± 0.014
6	1.04	0.132 ± 0.010

Average Half-life : 9.23 ± .32 s

Energy: 20.5 MeV

#	Half-life [s]	Relative abundance a(i)
1	55.7 ± 0.000	0.080 ± 0.008
2	24.4 ± 0.000	0.161 ± 0.002
3	15.9 ± 0.000	0.071 ± 0.002
4	11.3 ± 0.000	0.062 ± 0.003
5	6.05 ± 0.000	0.062 ± 0.006
6	4.45 ± 0.000	0.090 ± 0.006
7	2.67 ± 0.000	0.129 ± 0.008
8	2.02 ± 0.000	0.106 ± 0.012
9	1.70 ± 0.000	0.088 ± 0.015
10	1.60 ± 0.000	0.082 ± 0.019
11	1.30 ± 0.000	0.070 ± 0.029

Average Half-life : 11.92 ± .46 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.091 ± 0.008
2	24.5	0.055 ± 0.001
3	16.3	0.250 ± 0.004
4	5.21	0.052 ± 0.001
5	2.37	0.467 ± 0.028
6	1.04	0.085 ± 0.030

Average Half-life : 11.95 ± .46 s

Energy: 21.0 MeV

#	Half-life [s]	Relative abundance a(i)
1	55.7 ± 0.000	0.060 ± 0.006
2	24.4 ± 0.000	0.123 ± 0.001
3	15.9 ± 0.000	0.048 ± 0.002
4	11.3 ± 0.000	0.047 ± 0.002
5	6.05 ± 0.000	0.047 ± 0.004
6	4.45 ± 0.000	0.056 ± 0.005
7	2.67 ± 0.000	0.134 ± 0.005
8	2.02 ± 0.000	0.162 ± 0.001
9	1.70 ± 0.000	0.135 ± 0.008
10	1.60 ± 0.000	0.120 ± 0.010
11	1.30 ± 0.000	0.068 ± 0.019

Average Half-life : 9.38 ± .34 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.078 ± 0.006
2	24.5	0.008 ± 0.001
3	16.3	0.214 ± 0.003
4	5.21	0.008 ± 0.0002
5	2.37	0.568 ± 0.017
6	1.04	0.125 ± 0.018

Average Half-life : 9.50 ± .34 s

235U

Energy: Thermal Spectrum

4-Groups
Original Model - A. H. SNELL, A. V. NEDZEL, and H. W. IBSER, Metallurgical Laboratory report C-81 (U), Univ. of Chicago (May 15, 1942); as referenced in H. D. Smyth, Atomic Energy For Military Purposes, Princeton University Press, Princeton, NJ (1945), Appendix III.

#	Half-life [s]	Relative abundance a(i)
1	57.0 ± 3.000	0.038 ± 0.004
2	24.0 ± 2.000	0.283 ± 0.028
3	7.00 ± 0.000	0.340 ± 0.034
4	2.50 ± 0.000	0.339 ± 0.034

Average Half-life : 12.19 ± .95 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.050 ± 0.012
2	24.5	0.158 ± 0.027
3	16.3	0.201 ± 0.004
4	5.21	0.315 ± 0.037
5	2.37	0.276 ± 0.029

Average Half-life : 12.22 ± .96 s

4-Groups
Original Model - W. C. REDMAN and D. SAXON, Delayed Neutrons in Plutonium and Uranium Fission, Argonne Laboratory report CK-2318 (U), Chicago, IL (November 4, 1944). W. C. REDMAN and D. SAXON, Delayed Neutrons in Plutonium and Uranium Fission, Physical Review, 72, No. 7, 570 (October 1, 1947).

#	Half-life [s]	Relative abundance a(i)
1	55.0 ± 0.400	0.035 ± 0.001
2	22.5 ± 0.200	0.241 ± 0.024
3	4.43 ± 0.100	0.327 ± 0.005
4	1.13 ± 0.060	0.397 ± 0.019

Average Half-life : 9.24 ± .55 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.034 ± 0.001
2	24.5	0.176 ± 0.020
3	16.3	0.073 ± 0.014
4	5.21	0.213 ± 0.001
5	2.37	0.186 ± 0.011
6	1.04	0.319 ± 0.015

Average Half-life : 9.25 ± .54 s

5-Groups
Original Model - F. de HOFFMANN, B. R. FELD, O. R. FRISCH, J. W. OSBORN, and P. R. STEIN, Delayed Neutrons from 25 (235U) After Short Irradiation, Los Alamos Scientific Laboratory report LA-252 (U), Los Alamos, NM (April 6, 1945).

#	Half-life [s]	Relative abundance a(i)
1	55.4 ± 0.690	0.054 ± 0.005
2	22.5 ± 0.420	0.294 ± 0.029
3	5.48 ± 0.350	0.297 ± 0.029
4	1.73 ± 0.210	0.279 ± 0.028
5	0.360 ± 0.070	0.076 ± 0.008

Average Half-life : 11.74 ± .75 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.054 ± 0.005
2	24.5	0.194 ± 0.025
3	16.3	0.132 ± 0.018
4	5.21	0.223 ± 0.031
5	2.37	0.238 ± 0.018
6	1.04	0.088 ± 0.014
7	0.424	0.059 ± 0.009
8	0.195	0.013 ± 0.000

Average Half-life : 11.75 ± .75 s

5-Groups
Original Model - D. J. HUGHES, J. DABBS, and A. CAHN, Delayed Neutrons from Fission of 25 (235U), Argonne Laboratory report CP-3094 (U), Univ. of Chicago (August 27, 1945). D. J. HUGHES, J. DABBS, A. CAHN, and D. HALL, Delayed Neutrons from Fission of 235U, Physical Review, 73, No. 2, 111 (January 15, 1948).

#	Half-life [s]	Relative abundance a(i)
1	55.6 ± 0.200	0.035 ± 0.001
2	22.0 ± 0.200	0.228 ± 0.002
3	4.51 ± 0.100	0.291 ± 0.018
4	1.52 ± 0.050	0.330 ± 0.018
5	0.430 ± 0.050	0.116 ± 0.011

Average Half-life : 8.81 ± .13 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.034 ± 0.001
2	24.5	0.147 ± 0.002
3	16.3	0.094 ± 0.002
4	5.21	0.162 ± 0.015
5	2.37	0.312 ± 0.018
6	1.04	0.148 ± 0.011
7	0.424	0.104 ± 0.009

Average Half-life : 8.81 ± .13 s

5-Groups
Original Model - A. H. SNELL, J. S. LEVINGER, R. G. WILKINSON, E. P. MEINERS, M. B. SAMPSON, Chemical Isolation of Two of the Delayed Neutron Activities; Resolution of Delayed Neutron Periods, Physical Review, 70, 111 (1946). A. H. SNELL, V. A. NEDZEL, H. W. IBSER, J. S. LEVINGER, R. G. WILKINSON, and M. B. SAMPSON, Studies of the Delayed Neutrons�, Physical Review, 72, No. 7, 541 (Oct. 1, 1947).

#	Half-life [s]	Relative abundance a(i)
1	56.0 ± 0.000	0.045 ± 0.005
2	23.0 ± 0.000	0.319 ± 0.032
3	4.40 ± 0.000	0.350 ± 0.035
4	1.80 ± 0.000	0.159 ± 0.016
5	0.400 ± 0.000	0.127 ± 0.013

Average Half-life : 11.70 ± .79 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.042 ± 0.004
2	24.5	0.276 ± 0.029
3	16.3	0.040 ± 0.013
4	5.21	0.251 ± 0.030
5	2.37	0.251 ± 0.025
6	1.04	0.005 ± 0.000
7	0.424	0.132 ± 0.011
8	0.195	0.003 ± 0.006

Average Half-life : 11.70 ± .79 s

#	Half-life [s]	Relative abundance a(i)
1	55.3 ± 0.900	0.039 ± 0.003
2	22.2 ± 0.200	0.257 ± 0.018
3	4.50 ± 0.040	0.330 ± 0.031
4	1.50 ± 0.070	0.374 ± 0.033

Average Half-life : 9.91 ± .46 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.045 ± 0.003
2	24.5	0.117 ± 0.015
3	16.3	0.176 ± 0.010
4	5.21	0.111 ± 0.026
5	2.37	0.426 ± 0.031
6	1.04	0.125 ± 0.021

Average Half-life : 9.94 ± .45 s

#	Half-life [s]	Relative abundance a(i)
1	55.7 ± 1.300	0.033 ± 0.003
2	22.7 ± 0.710	0.219 ± 0.009
3	6.22 ± 0.230	0.196 ± 0.022
4	2.30 ± 0.090	0.395 ± 0.011
5	0.610 ± 0.083	0.115 ± 0.009
6	0.230 ± 0.025	0.042 ± 0.008

Average Half-life : 9.02 ± .34 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.033 ± 0.004
2	24.5	0.154 ± 0.007
3	16.3	0.091 ± 0.009
4	5.21	0.197 ± 0.023
5	2.37	0.331 ± 0.007
6	1.04	0.090 ± 0.005
7	0.424	0.081 ± 0.002
8	0.195	0.023 ± 0.010

Average Half-life : 9.02 ± .34 s

#	Half-life [s]	Relative abundance a(i)
1	55.5 ± 0.000	0.039 ± 0.004
2	22.0 ± 0.000	0.245 ± 0.025
3	6.06 ± 0.000	0.206 ± 0.021
4	2.25 ± 0.000	0.418 ± 0.042
5	0.462 ± 0.000	0.092 ± 0.009

Average Half-life : 9.79 ± .61 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.038 ± 0.004
2	24.5	0.154 ± 0.020
3	16.3	0.120 ± 0.018
4	5.21	0.189 ± 0.019
5	2.37	0.373 ± 0.041
6	1.04	0.052 ± 0.011
7	0.424	0.074 ± 0.008

Average Half-life : 9.78 ± .62 s

#	Half-life [s]	Relative abundance a(i)
1	55.7 ± 0.000	0.021 ± 0.003
2	22.6 ± 1.400	0.226 ± 0.009
3	5.30 ± 0.050	0.274 ± 0.030
4	1.91 ± 0.020	0.372 ± 0.014
5	0.372 ± 0.026	0.107 ± 0.015

Average Half-life : 8.48 ± .44 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.022 ± 0.007
2	24.5	0.147 ± 0.009
3	16.3	0.104 ± 0.002
4	5.21	0.190 ± 0.026
5	2.37	0.368 ± 0.021
6	1.04	0.062 ± 0.001
7	0.424	0.096 ± 0.001
8	0.195	0.012 ± 0.013

Average Half-life : 8.48 ± .45 s

5-Groups
Original Model - R. J. ONEGA, G. E. RAMBO, M. HUIZINGA, and A. ROBESON, Delayed-Neutron Half-Lives for 233U, 235U, and 239Pu, Trans. Am. Nucl. Soc., 12, 1, 289 (June 5-19, 1969).

#	Half-life [s]	Relative abundance a(i)
1	55.7 ± 0.000	0.020 ± 0.009
2	22.6 ± 1.400	0.213 ± 0.008
3	5.30 ± 0.050	0.295 ± 0.034
4	1.90 ± 0.020	0.357 ± 0.016
5	0.375 ± 0.026	0.114 ± 0.015

Average Half-life : 8.22 ± .64 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.021 ± 0.011
2	24.5	0.138 ± 0.007
3	16.3	0.100 ± 0.002
4	5.21	0.213 ± 0.032
5	2.37	0.352 ± 0.019
6	1.04	0.061 ± 0.001
7	0.424	0.104 ± 0.015
8	0.195	0.012 ± 0.000

Average Half-life : 8.23 ± .66 s

3-Groups
Original Model - N. G. CHRYSOCHOIDES, D. C. PERRICOS, C. C. ZIKIDES, Relative Delayed Neutron Group Yields from 231Pa Fission with Fission Neutrons, J. Nucl. Energy, 24, 157 (1970).

#	Half-life [s]	Relative abundance a(i)
1	55.6 ± 0.000	0.108 ± 0.001
2	24.4 ± 0.000	0.529 ± 0.010
3	15.8 ± 0.000	0.363 ± 0.017

Average Half-life : 24.65 ± .37 s

4-Groups
Expanded Model using a fixed set of Half-lives
G. D. Spriggs, J. M. Campbell and V. M. Piksaikin, An 8-Group Neutron Model Based on a Consistent Set of Half-Lives, Los Alamos National Laboratory report LA-UR-98-1619, Rev. 3, (October 6, 1999).

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.205 ± 0.001
2	24.5	0.020 ± 0.009
3	16.3	0.774 ± 0.017
4	5.21	0.001 ± 0.002

Average Half-life : 24.49 ± .36 s

6-Groups
Original Model - Von H.-D. SCHUSSLER and G. HERMANN, Main Components of the Delayed-Neutron Precursors in the Fission of 235U by Thermal Neutrons, Radiochimica Acta, 18, No. 3, 123 (1972).

#	Half-life [s]	Relative abundance a(i)
1	55.7 ± 1.900	0.037 ± 0.001
2	22.7 ± 1.000	0.220 ± 0.022
3	6.22 ± 0.340	0.200 ± 0.011
4	2.30 ± 0.130	0.377 ± 0.009
5	0.610 ± 0.120	0.117 ± 0.009
6	0.230 ± 0.037	0.049 ± 0.004

Average Half-life : 9.28 ± .56 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.037 ± 0.004
2	24.5	0.154 ± 0.020
3	16.3	0.093 ± 0.012
4	5.21	0.201 ± 0.014
5	2.37	0.314 ± 0.006
6	1.04	0.089 ± 0.002
7	0.424	0.086 ± 0.002
8	0.195	0.027 ± 0.004

Average Half-life : 9.28 ± .58 s

5-Groups
Original Model - R. W. WALDO, and R. A. KARAM, Measured Delayed Neutron Yields, Trans. Amer. Nucl. Soc., 39, 879 (1981). R. W. WALDO, R. A. KARAM, R. A. MEYER, Delayed Neutron Yields: Time Dependent Measurements and a Predictive Model, Physical Review C, 23, No. 3, 1113 (March 1981).

#	Half-life [s]	Relative abundance a(i)
1	55.2 ± 0.130	0.033 ± 0.001
2	22.4 ± 0.073	0.205 ± 0.004
3	6.08 ± 0.005	0.200 ± 0.006
4	2.11 ± 0.045	0.388 ± 0.010
5	0.336 ± 0.051	0.175 ± 0.026

Average Half-life : 8.49 ± .11 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.033 ± 0.001
2	24.5	0.125 ± 0.003
3	16.3	0.116 ± 0.004
4	5.21	0.145 ± 0.007
5	2.37	0.381 ± 0.008
6	1.04	0.003 ± 0.012
7	0.424	0.166 ± 0.020
8	0.195	0.031 ± 0.012

Average Half-life : 8.49 ± .11 s

5-Groups
Original Model - S. SYNETOS, and J. G. WILLIAMS, Delayed Neutron Yield and Decay Constants for Thermal Neutron-Induced Fission of 235U, Nucl. Energy, 22, No. 4, 267 (Aug. 1983).

#	Half-life [s]	Relative abundance a(i)
1	56.5 ± 0.550	0.035 ± 0.002
2	22.4 ± 0.290	0.227 ± 0.009
3	7.00 ± 0.780	0.148 ± 0.023
4	2.73 ± 0.210	0.403 ± 0.017
5	0.770 ± 0.094	0.187 ± 0.017

Average Half-life : 9.34 ± .33 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.030 ± 0.002
2	24.5	0.196 ± 0.004
3	16.3	0.038 ± 0.015
4	5.21	0.282 ± 0.027
5	2.37	0.218 ± 0.004
6	1.04	0.205 ± 0.004
7	0.424	0.031 ± 0.013

Average Half-life : 9.32 ± .32 s

5-Groups
Original Model - A. N. GUDKOV, S. V. KRIVASHEEV, A. B. KOLDOBSKII, E. Y. BOBKOV, Y. F. KOLEGANOV, A. V. ZVONAREV, and V. B. PAVLOVICH, Determining Delayed- Neutron Group Yields for Fast Neutron 235U and 241Am, Sov. Atomic Energy, 67, No. 3, 702 (1989).

#	Half-life [s]	Relative abundance a(i)
1	55.7 ± 1.300	0.036 ± 0.003
2	22.7 ± 0.710	0.239 ± 0.013
3	6.22 ± 0.230	0.203 ± 0.010
4	2.30 ± 0.090	0.408 ± 0.023
5	0.610 ± 0.083	0.114 ± 0.018

Average Half-life : 9.70 ± .38 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.034 ± 0.004
2	24.5	0.188 ± 0.013
3	16.3	0.069 ± 0.001
4	5.21	0.236 ± 0.015
5	2.37	0.297 ± 0.019
6	1.04	0.134 ± 0.015
7	0.424	0.042 ± 0.012

Average Half-life : 9.70 ± .39 s

Energy: TRIGA Reactor Spectrum

5-Groups
Original Model - H. H. SALEH, T. A. PARISH, S. RAMAN, and N. SHINOHARA, Measurements of Delayed-Neutron Decay Constants and Fission Yields from 235U, 237Np, 241Am, and 243Am, Nucl. Sci. Eng., 125, 51 (1997).

#	Half-life [s]	Relative abundance a(i)
1	55.5 ± 4.000	0.037 ± 0.006
2	19.3 ± 1.100	0.246 ± 0.040
3	6.24 ± 0.390	0.201 ± 0.034
4	2.31 ± 0.039	0.402 ± 0.067
5	0.630 ± 0.014	0.114 ± 0.019

Average Half-life : 9.06 ± .94 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.033 ± 0.008
2	24.5	0.092 ± 0.023
3	16.3	0.178 ± 0.035
4	5.21	0.230 ± 0.032
5	2.37	0.292 ± 0.064
6	1.04	0.137 ± 0.022
7	0.424	0.038 ± 0.011

Average Half-life : 9.05 ± .93 s

Energy: Fast Spectrum

6-Groups
Original Model - G. R. KEEPIN and T. F. WIMETT, Delayed Neutrons, Proc. 1st International Conf. on the Peaceful Uses of Atomic Energy, United Nations, NY, Vol. IV, P/831, 162 (August 8- 20, 1955).

#	Half-life [s]	Relative abundance a(i)
1	54.3 ± 0.900	0.036 ± 0.006
2	21.7 ± 0.800	0.210 ± 0.019
3	5.87 ± 0.170	0.192 ± 0.027
4	2.18 ± 0.070	0.409 ± 0.022
5	0.460 ± 0.030	0.135 ± 0.008
6	0.126 ± 0.018	0.018 ± 0.004

Average Half-life : 8.59 ± .58 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.032 ± 0.006
2	24.5	0.141 ± 0.017
3	16.3	0.091 ± 0.010
4	5.21	0.187 ± 0.030
5	2.37	0.335 ± 0.014
6	1.04	0.103 ± 0.013
7	0.424	0.076 ± 0.002
8	0.195	0.036 ± 0.005

Average Half-life : 8.60 ± .58 s

Energy: Fast Neutrons

#	Half-life [s]	Relative abundance a(i)
1	55.6 ± 0.000	0.035 ± 0.001
2	22.0 ± 0.000	0.224 ± 0.007
3	4.51 ± 0.000	0.340 ± 0.017
4	1.52 ± 0.000	0.320 ± 0.021
5	0.430 ± 0.000	0.081 ± 0.027

Average Half-life : 8.93 ± .18 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.034 ± 0.001
2	24.5	0.149 ± 0.006
3	16.3	0.086 ± 0.004
4	5.21	0.207 ± 0.013
5	2.37	0.315 ± 0.018
6	1.04	0.139 ± 0.016
7	0.424	0.070 ± 0.026

Average Half-life : 8.93 ± .18 s

Energy: Fission Spectrum

#	Half-life [s]	Relative abundance a(i)
1	54.5 ± 0.940	0.038 ± 0.003
2	21.8 ± 0.540	0.213 ± 0.005
3	6.00 ± 0.170	0.188 ± 0.016
4	2.23 ± 0.060	0.407 ± 0.007
5	0.496 ± 0.029	0.128 ± 0.008
6	0.179 ± 0.017	0.026 ± 0.003

Average Half-life : 8.82 ± .25 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.035 ± 0.003
2	24.5	0.137 ± 0.006
3	16.3	0.101 ± 0.002
4	5.21	0.179 ± 0.016
5	2.37	0.349 ± 0.007
6	1.04	0.083 ± 0.002
7	0.424	0.090 ± 0.006
8	0.195	0.027 ± 0.001

Average Half-life : 8.82 ± .25 s

Energy: Fast Spectrum

6-Groups
Original Model - C. B. BESANT, P. J. CHALLEN, M. H. McTAGGART, P. TAVOULARIDIS, J. G. WILLIAMS, Absolute Yields and Group Constants of Delayed Neutrons in Fast Fission of 235U, 238U, and 239Pu, J. Br. Nucl. Energy Soc., 16, 161 (1977).

#	Half-life [s]	Relative abundance a(i)
1	53.3 ± 0.410	0.035 ± 0.002
2	21.3 ± 0.130	0.234 ± 0.003
3	5.13 ± 0.380	0.216 ± 0.069
4	2.52 ± 0.350	0.290 ± 0.055
5	0.829 ± 0.150	0.178 ± 0.038
6	0.185 ± 0.045	0.047 ± 0.013

Average Half-life : 8.84 ± .42 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.026 ± 0.002
2	24.5	0.181 ± 0.003
3	16.3	0.054 ± 0.001
4	5.21	0.255 ± 0.074
5	2.37	0.235 ± 0.049
6	1.04	0.175 ± 0.031
7	0.424	0.028 ± 0.022
8	0.195	0.047 ± 0.009

Average Half-life : 8.84 ± .42 s

Energy: Fission Spectrum

#	Half-life [s]	Relative abundance a(i)
1	54.5 ± 0.000	0.043 ± 0.007
2	21.8 ± 0.000	0.186 ± 0.025
3	6.00 ± 0.000	0.180 ± 0.027
4	2.23 ± 0.000	0.405 ± 0.060
5	0.496 ± 0.000	0.160 ± 0.056
6	0.179 ± 0.000	0.026 ± 0.004

Average Half-life : 8.46 ± .71 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.039 ± 0.007
2	24.5	0.123 ± 0.020
3	16.3	0.086 ± 0.017
4	5.21	0.177 ± 0.028
5	2.37	0.339 ± 0.053
6	1.04	0.094 ± 0.038
7	0.424	0.116 ± 0.049
8	0.195	0.026 ± 0.001

Average Half-life : 8.47 ± .71 s

6-Groups
Original Model - D. LOAIZA, G. BRUNSON, and R. SANCHEZ, Measurement of Delayed-Neutron Parameters for 235U, Trans. Amer. Nucl. Soc., 76, 361 (1997). D. LOAIZA, Measurement of Delayed-Neutron Parameters for 235U and 237Np, Ph.D. Dissertation, University of New Mexico, Albuquerque, NM (1997).

#	Half-life [s]	Relative abundance a(i)
1	54.6 ± 0.430	0.039 ± 0.001
2	22.0 ± 0.280	0.235 ± 0.012
3	5.92 ± 0.660	0.207 ± 0.018
4	2.23 ± 0.160	0.381 ± 0.021
5	0.506 ± 0.019	0.114 ± 0.005
6	0.181 ± 0.002	0.024 ± 0.001

Average Half-life : 9.44 ± .34 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.036 ± 0.002
2	24.5	0.158 ± 0.005
3	16.3	0.102 ± 0.017
4	5.21	0.198 ± 0.020
5	2.37	0.325 ± 0.007
6	1.04	0.079 ± 0.012
7	0.424	0.079 ± 0.005
8	0.195	0.024 ± 0.0005

Average Half-life : 9.44 ± .34 s

Energy: Fast Spectrum

6-Groups
Original Model - W. S. CHARLTON, Delayed Neutron Emission Measurements from Fast Fission of Actinide Waste Isotopes, Master�s Thesis, Texas A&M University (August, 1998).

#	Half-life [s]	Relative abundance a(i)
1	55.5 ± 0.890	0.033 ± 0.001
2	24.5 ± 0.350	0.137 ± 0.007
3	16.5 ± 0.200	0.112 ± 0.006
4	4.39 ± 0.056	0.268 ± 0.010
5	2.16 ± 0.027	0.265 ± 0.011
6	0.712 ± 0.012	0.186 ± 0.009

Average Half-life : 8.90 ± .22 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.026 ± 0.002
2	24.5	0.198 ± 0.007
3	16.3	0.021 ± 0.005
4	5.21	0.287 ± 0.009
5	2.37	0.203 ± 0.011
6	1.04	0.225 ± 0.009
7	0.424	0.040 ± 0.005

Average Half-life : 8.88 ± .22 s

Energy: 0.624 MeV

8-Groups
Original Model - V.M. Piksaikin, L.E. Kazakov, S.G. Isaev, M.Z. Tarasko, V.A.Roshchenko, G.D. Spriggs, J.M. Campbell, Energy Dependence of Relative Abundances and Periods of Delayed Neutrons from Neutron Induced Fission of U-235, U-238, Pu-239 in 6- and 8-group Model Representation, Progress in Nuclear Energy, 2002, v.41, No.1-4, pp.203-222.

#	Half-life [s]	Relative abundance a(i)
1	55.6 ± 0.000	0.034 ± 0.001
2	24.5 ± 0.000	0.150 ± 0.003
3	16.3 ± 0.000	0.099 ± 0.003
4	5.21 ± 0.000	0.200 ± 0.004
5	2.37 ± 0.000	0.312 ± 0.007
6	1.04 ± 0.000	0.093 ± 0.004
7	0.424 ± 0.000	0.087 ± 0.004
8	0.195 ± 0.000	0.024 ± 0.001

Average Half-life : 9.11 ± .10 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.034 ± 0.001
2	24.5	0.150 ± 0.003
3	16.3	0.099 ± 0.003
4	5.21	0.200 ± 0.004
5	2.37	0.312 ± 0.007
6	1.04	0.093 ± 0.004
7	0.424	0.087 ± 0.004
8	0.195	0.024 ± 0.001

Average Half-life : 9.11 ± .10 s

Energy: 1.3 MeV

5-Groups
Original Model - S. A. COX and E. E. D. WHITING, Energy Dependence of the Delayed Neutron Yield from Neutron Induced Fission of 232Th, 235U, and 238U, Reactor Physics Division Annual Report, ANL-7410, 27-30 (July 1, 1967 to June 30, 1968).

#	Half-life [s]	Relative abundance a(i)
1	54.5 ± 0.000	0.033 ± 0.003
2	22.1 ± 0.000	0.218 ± 0.022
3	6.51 ± 0.000	0.184 ± 0.018
4	2.22 ± 0.000	0.397 ± 0.040
5	0.497 ± 0.000	0.168 ± 0.017

Average Half-life : 8.78 ± .54 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.029 ± 0.003
2	24.5	0.155 ± 0.017
3	16.3	0.090 ± 0.016
4	5.21	0.202 ± 0.016
5	2.37	0.285 ± 0.038
6	1.04	0.127 ± 0.016
7	0.424	0.113 ± 0.014

Average Half-life : 8.78 ± .53 s

Energy: 2.4 MeV

#	Half-life [s]	Relative abundance a(i)
1	56.1 ± 0.000	0.037 ± 0.004
2	22.3 ± 0.000	0.221 ± 0.022
3	5.46 ± 0.000	0.217 ± 0.022
4	2.17 ± 0.000	0.409 ± 0.041
5	0.435 ± 0.000	0.116 ± 0.012

Average Half-life : 9.13 ± .55 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.037 ± 0.004
2	24.5	0.145 ± 0.018
3	16.3	0.095 ± 0.015
4	5.21	0.173 ± 0.018
5	2.37	0.403 ± 0.041
6	1.04	0.039 ± 0.012
7	0.424	0.107 ± 0.011

Average Half-life : 9.12 ± .56 s

Energy: 3.3 MeV

#	Half-life [s]	Relative abundance a(i)
1	55.2 ± 0.000	0.043 ± 0.004
2	21.6 ± 0.000	0.219 ± 0.022
3	6.32 ± 0.000	0.210 ± 0.021
4	2.24 ± 0.000	0.428 ± 0.043
5	0.650 ± 0.000	0.100 ± 0.010

Average Half-life : 9.45 ± .56 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.040 ± 0.004
2	24.5	0.133 ± 0.016
3	16.3	0.116 ± 0.017
4	5.21	0.217 ± 0.019
5	2.37	0.329 ± 0.041
6	1.04	0.136 ± 0.015
7	0.424	0.028 ± 0.003

Average Half-life : 9.45 ± .55 s

Energy: 5 MeV

5-Groups
Original Model - B. P. MAKSYUTENKO, Relative Yields of Delayed Neutrons in the Fission of 235U and 238U, Iadernaia Fizika (English Translation), 19, No. 1, 910 (July 1, 1965). 1958).

#	Half-life [s]	Relative abundance a(i)
1	55 ± 0.000	0.053 ± 0.005
2	24 ± 0.000	0.182 ± 0.011
3	15.5 ± 0.000	0.101 ± 0.014
4	5.2 ± 0.000	0.223 ± 0.023
5	2.2 ± 0.000	0.442 ± 0.045

Average Half-life : 10.95 ± .48 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.054 ± 0.005
2	24.5	0.139 ± 0.010
3	16.3	0.157 ± 0.015
4	5.21	0.167 ± 0.020
5	2.37	0.471 ± 0.045
6	1.04	0.013 ± 0.010

Average Half-life : 10.96 ± .47 s

Energy: 6 MeV

5-Groups
Original Model - B. P. MAKSYUTENKO, Relative Yields of Delayed Neutrons in the Fission of 235U and 238U, Iadernaia Fizika (English Translation), 19, No. 1, 910 (July 1, 1965).

#	Half-life [s]	Relative abundance a(i)
1	55 ± 0.000	0.057 ± 0.006
2	24 ± 0.000	0.160 ± 0.002
3	15.5 ± 0.000	0.132 ± 0.002
4	5.2 ± 0.000	0.071 ± 0.010
5	2.2 ± 0.000	0.580 ± 0.052

Average Half-life : 10.65 ± .34 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.058 ± 0.006
2	24.5	0.116 ± 0.003
3	16.3	0.190 ± 0.002
4	5.21	0.006 ± 0.0001
5	2.37	0.612 ± 0.051
6	1.04	0.019 ± 0.014

Average Half-life : 10.66 ± .34 s

5-Groups
Original Model - B. P. MAKSYUTENKO, Relative Yields of Delayed Neutrons in the Fission of 235U and 238U, Iadernaia Fizika (English Translation), 19, No. 1, 910 (July 1, 1965).

#	Half-life [s]	Relative abundance a(i)
1	55 ± 0.000	0.048 ± 0.005
2	24 ± 0.000	0.137 ± 0.002
3	15.5 ± 0.000	0.112 ± 0.002
4	5.2 ± 0.000	0.206 ± 0.008
5	2.2 ± 0.000	0.496 ± 0.045

Average Half-life : 9.86 ± .29 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.051 ± 0.005
2	24.5	0.092 ± 0.002
3	16.3	0.171 ± 0.003
4	5.21	0.144 ± 0.003
5	2.37	0.527 ± 0.043
6	1.04	0.015 ± 0.015

Average Half-life : 9.87 ± .29 s

Energy: 6.3 MeV

5-Groups
Original Model - B. P. MAKSYUTENKO, Relative Yields of Delayed Neutrons in the Fission of 235U and 238U, Iadernaia Fizika (English Translation), 19, No. 1, 910 (July 1, 1965).

#	Half-life [s]	Relative abundance a(i)
1	55 ± 0.000	0.047 ± 0.005
2	24 ± 0.000	0.163 ± 0.005
3	15.5 ± 0.000	0.101 ± 0.006
4	5.2 ± 0.000	0.247 ± 0.009
5	2.2 ± 0.000	0.442 ± 0.018

Average Half-life : 10.30 ± .30 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.048 ± 0.005
2	24.5	0.121 ± 0.004
3	16.3	0.156 ± 0.006
4	5.21	0.192 ± 0.008
5	2.37	0.470 ± 0.018
6	1.04	0.013 ± 0.004

Average Half-life : 10.31 ± .30 s

Energy: 6.6 MeV

5-Groups
Original Model - B. P. MAKSYUTENKO, Relative Yields of Delayed Neutrons in the Fission of 235U and 238U, Iadernaia Fizika (English Translation), 19, No. 1, 910 (July 1, 1965).

#	Half-life [s]	Relative abundance a(i)
1	55 ± 0.000	0.073 ± 0.007
2	24 ± 0.000	0.280 ± 0.007
3	15.5 ± 0.000	0.076 ± 0.009
4	5.2 ± 0.000	0.337 ± 0.015
5	2.2 ± 0.000	0.234 ± 0.028

Average Half-life : 14.19 ± .46 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.072 ± 0.007
2	24.5	0.249 ± 0.006
3	16.3	0.116 ± 0.009
4	5.21	0.307 ± 0.014
5	2.37	0.249 ± 0.028
6	1.04	0.007 ± 0.007

Average Half-life : 14.20 ± .46 s

Energy: 6.9 MeV

5-Groups
Original Model - B. P. MAKSYUTENKO, Relative Yields of Delayed Neutrons in the Fission of 235U and 238U, Iadernaia Fizika (English Translation), 19, No. 1, 910 (July 1, 1965).

#	Half-life [s]	Relative abundance a(i)
1	55 ± 0.000	0.054 ± 0.005
2	24 ± 0.000	0.177 ± 0.034
3	15.5 ± 0.000	0.109 ± 0.005
4	5.2 ± 0.000	0.260 ± 0.008
5	2.2 ± 0.000	0.400 ± 0.015

Average Half-life : 11.14 ± .87 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.055 ± 0.005
2	24.5	0.136 ± 0.033
3	16.3	0.162 ± 0.011
4	5.21	0.210 ± 0.004
5	2.37	0.426 ± 0.016
6	1.04	0.012 ± 0.002

Average Half-life : 11.15 ± .88 s

Energy: 7.22 MeV

5-Groups
Original Model - B. P. MAKSYUTENKO, Relative Yields of Delayed Neutrons in the Fission of 235U and 238U, Iadernaia Fizika (English Translation), 19, No. 1, 910 (July 1, 1965).

#	Half-life [s]	Relative abundance a(i)
1	55 ± 0.000	0.058 ± 0.006
2	24 ± 0.000	0.215 ± 0.002
3	15.5 ± 0.000	0.113 ± 0.002
4	5.2 ± 0.000	0.221 ± 0.007
5	2.2 ± 0.000	0.393 ± 0.027

Average Half-life : 12.12 ± .33 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.059 ± 0.006
2	24.5	0.172 ± 0.002
3	16.3	0.167 ± 0.003
4	5.21	0.171 ± 0.003
5	2.37	0.418 ± 0.027
6	1.04	0.012 ± 0.006

Average Half-life : 12.13 ± .33 s

Energy: 7.76 MeV

5-Groups
Original Model - B. P. MAKSYUTENKO, Relative Yields of Delayed Neutrons in the Fission of 235U and 238U, Iadernaia Fizika (English Translation), 19, No. 1, 910 (July 1, 1965).

#	Half-life [s]	Relative abundance a(i)
1	55 ± 0.000	0.060 ± 0.006
2	24 ± 0.000	0.205 ± 0.003
3	15.5 ± 0.000	0.106 ± 0.004
4	5.2 ± 0.000	0.241 ± 0.008
5	2.2 ± 0.000	0.388 ± 0.019

Average Half-life : 11.96 ± .35 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.061 ± 0.006
2	24.5	0.164 ± 0.003
3	16.3	0.159 ± 0.005
4	5.21	0.192 ± 0.006
5	2.37	0.413 ± 0.019
6	1.04	0.012 ± 0.004

Average Half-life : 11.97 ± .35 s

Energy: 14.0 MeV

4-Groups
Original Model - O. J. HAHN, Measurement of Delayed Neutrons, Dissertation, Princeton University (1964).

#	Half-life [s]	Relative abundance a(i)
1	64.8 ± 11.000	0.489 ± 0.020
2	22.3 ± 3.200	0.158 ± 0.020
3	6.54 ± 0.670	0.240 ± 0.030
4	2.25 ± 0.340	0.112 ± 0.052

Average Half-life : 37.03 ± 5.58 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.422 ± 0.023*
2	24.5	0.042 ± 0.002*
3	16.3	0.042 ± 0.002*
4	5.21	0.042 ± 0.002*
5	2.37	0.449 ± 0.024*
6	1.04	0.002 ± 0.0001*

Average Half-life : 26.47 ± 1.28 s

Energy: 14.7 MeV

#	Half-life [s]	Relative abundance a(i)
1	54.6 ± 0.500	0.057 ± 0.001
2	20.2 ± 0.200	0.192 ± 0.002
3	5.36 ± 0.300	0.190 ± 0.020
4	2.38 ± 0.100	0.357 ± 0.013
5	0.770 ± 0.070	0.120 ± 0.009
6	0.240 ± 0.010	0.084 ± 0.007

Average Half-life : 8.97 ± .15 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.052 ± 0.001
2	24.5	0.099 ± 0.002
3	16.3	0.107 ± 0.004
4	5.21	0.185 ± 0.022
5	2.37	0.346 ± 0.007
6	1.04	0.079 ± 0.009
7	0.424	0.087 ± 0.002
8	0.195	0.045 ± 0.008

Average Half-life : 8.97 ± .15 s

Energy: 14.9 MeV

6-Groups
Original Model - R. H. AUGUSTON, L. V. EAST, and H. O. MENLOVE, Delayed Neutron Abundances and Half-Lives for 14.9-MeV Fission, excerpt from Los Alamos National Laboratory Program Status Report LA-4315-MS (July-September, 1969), p. 18.

#	Half-life [s]	Relative abundance a(i)
1	50.6 ± 1.900	0.063 ± 0.006
2	19.6 ± 0.660	0.188 ± 0.003
3	4.95 ± 0.350	0.234 ± 0.024
4	1.95 ± 0.120	0.357 ± 0.021
5	0.410 ± 0.090	0.118 ± 0.027
6	0.160 ± 0.070	0.039 ± 0.033

Average Half-life : 8.79 ± .39 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.046 ± 0.006
2	24.5	0.116 ± 0.005
3	16.3	0.092 ± 0.002
4	5.21	0.183 ± 0.027
5	2.37	0.332 ± 0.007
6	1.04	0.961 ± 0.025
7	0.424	0.072 ± 0.001
8	0.195	0.062 ± 0.038

Average Half-life : 8.80 ± .39 s

Energy: 15 MeV

#	Half-life [s]	Relative abundance a(i)
1	55.0 ± 0.000	0.051 ± 0.005
2	24.0 ± 0.000	0.181 ± 0.018
3	15.5 ± 0.000	0.203 ± 0.020
4	5.20 ± 0.000	0.402 ± 0.040
5	2.20 ± 0.000	0.163 ± 0.016

Average Half-life : 12.74 ± .64 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.051 ± 0.005
2	24.5	0.015 ± 0.017
3	16.3	0.240 ± 0.021
4	5.21	0.386 ± 0.040
5	2.37	0.172 ± 0.016
6	1.04	0.005 ± 0.004

Average Half-life : 12.75 ± .64 s

Energy: 18.5 MeV

#	Half-life [s]	Relative abundance a(i)
1	55.0 ± 0.000	0.073 ± 0.007
2	24.0 ± 0.000	0.151 ± 0.004
3	15.5 ± 0.000	0.125 ± 0.005
4	5.20 ± 0.000	0.238 ± 0.008
5	2.20 ± 0.000	0.414 ± 0.016

Average Half-life : 11.70 ± .42 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.074 ± 0.007
2	24.5	0.110 ± 0.004
3	16.3	0.177 ± 0.005
4	5.21	0.187 ± 0.007
5	2.37	0.440 ± 0.016
6	1.04	0.013 ± 0.004

Average Half-life : 11.72 ± .42 s

Energy: 19.5 MeV

#	Half-life [s]	Relative abundance a(i)
1	55.0 ± 0.000	0.052 ± 0.005
2	24.0 ± 0.000	0.104 ± 0.007
3	15.5 ± 0.000	0.116 ± 0.009
4	5.20 ± 0.000	0.107 ± 0.014
5	2.20 ± 0.000	0.621 ± 0.032

Average Half-life : 9.06 ± .37 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.055 ± 0.005
2	24.5	0.054 ± 0.006
3	16.3	0.183 ± 0.010
4	5.21	0.030 ± 0.012
5	2.37	0.660 ± 0.032
6	1.04	0.019 ± 0.007

Average Half-life : 9.08 ± .37 s

Energy: 20.0 MeV

#	Half-life [s]	Relative abundance a(i)
1	55.0 ± 0.000	0.046 ± 0.005
2	24.0 ± 0.000	0.163 ± 0.006
3	15.5 ± 0.000	0.109 ± 0.007
4	5.20 ± 0.000	0.192 ± 0.012
5	2.20 ± 0.000	0.489 ± 0.023

Average Half-life : 10.22 ± .32 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.066 ± 0.005
2	24.5	0.007 ± 0.005
3	16.3	0.297 ± 0.008
4	5.21	0.064 ± 0.011
5	2.37	0.561 ± 0.023
6	1.04	0.005 ± 0.005

Average Half-life : 10.34 ± .32 s

Energy: 21.0 MeV

#	Half-life [s]	Relative abundance a(i)
1	55.0 ± 0.000	0.051 ± 0.005
2	24.0 ± 0.000	0.212 ± 0.004
3	15.5 ± 0.000	0.098 ± 0.005
4	5.20 ± 0.000	0.252 ± 0.009
5	2.20 ± 0.000	0.387 ± 0.017

Average Half-life : 11.58 ± .31 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.052 ± 0.005
2	24.5	0.171 ± 0.004
3	16.3	0.151 ± 0.005
4	5.21	0.203 ± 0.008
5	2.37	0.412 ± 0.017
6	1.04	0.012 ± 0.004

Average Half-life : 11.59 ± .31 s

Energy: Thermal spectrum 6-groups

6-Groups
Original Model - Piksaikin, V.M., Kazakov, L.E., Isaev, S.G., Tarasko, M.Z., Roshchenko, V.A., Tertytchnyi, R.G., Springs, G.D., Campbell, J.M., 2002. Energy dependence of relative abundances and periods of delayed neutrons from neutron-induced fission of 235U, 238U, 239Pu in 6- and 8-group model representation, Prog. Nucl. Energy 41 (1-4), pp.203-222, 2002. V.M. Piksaikin et al., Relative abundances and periods of delayed neutrons from fission of U-233, U235 and Pu-239 by epithermal neutrons, Atomic energy, 2002, N0.2, pp.135-142. (in Russian) V. M. Piksaikin, L. E. Kazakov et al.,RELATIVE YIELD AND PERIOD OF INDIVIDUAL GROUPS OF DELAYED NEUTRONS IN 233U, 235U AND 239Pu FISSION BY EPITHERMAL NEUTRONS, Atomic Energy, Vol. 92, No. 2, 2002.(in English)

#	Half-life [s]	Relative abundance a(i)
1	53.9 ± 0.284	0.038 ± 0.001
2	22.3 ± 0.132	0.211 ± 0.004
3	6.40 ± 0.083	0.197 ± 0.004
4	2.26 ± 0.033	0.396 ± 0.005
5	0.494 ± 0.017	0.132 ± 0.004
6	0.179 ± 0.006	0.026 ± 0.001

Average Half-life : 8.98 ± 0.11 s

Correlation matrix

	a1	T1	a2	T2	a3	T3	a4	T4	a5	T5	a6	T6
a1	1
T1	0	1
a2	0	0.86	1
T2	0	0.43	0.24	1
a3	0	0.37	0.41	0.26	1
T3	0	0.16	-0.14	0.68	-0.38	1
a4	0	0.67	0.55	0.68	-0.07	0.65	1
T4	0	0.13	0.1	0.18	-0.59	0.36	0.24	1
a5	0	0.13	0.13	0.11	-0.02	0.06	-0.02	0.3	1
T5	0	0.09	0.08	0.08	0.01	0.05	-0.1	0.22	-0.01	1
a6	0	0.02	0.01	0.02	0.01	0	0.01	0.01	-0.01	0	1
T6	0	0.01	0.01	0.01	0	0	0	0.03	-0.02	0	0	1

Energy: 8-groups

8-Groups
Original Model - Expansion method: V.M. Piksaikin, L.E. Kazakov, S.G. Isaev, M.Z. Tarasko, V.A.Roshchenko, G.D. Spriggs, J.M. Campbell, Energy Dependence of Relative Abundances and Periods of Delayed Neutrons from Neutron Induced Fission of U-235, U-238, Pu-239 in 6- and 8-group Model Representation, Progress in Nuclear Energy, 2002, v.41, No.1-4, pp.203-222.

#	Half-life [s]	Relative abundance a(i)
1	55.6 ± +/-	0.001 ±
2	24.5 ± +/-	0.006 ±
3	16.3 ± +/-	0.004 ±
4	5.21 ± +/-	0.007 ±
5	2.37 ± +/-	0.009 ±
6	1.04 ± +/-	0.005 ±
7	0.424 ± +/-	0.004 ±
8	0.195 ± +/-	0.002 ±

Average Half-life : 9.00 ± 0.18 s

Energy: 0.34 MeV

6-Groups
Original Model - Piksaikin, V.M., Kazakov, L.E., Isaev, S.G., Tarasko, M.Z., Roshchenko, V.A., Tertytchnyi, R.G., Springs, G.D., Campbell, J.M., 2002. Energy dependence of relative abundances and periods of delayed neutrons from neutron-induced fission of 235U, 238U, 239Pu in 6- and 8-group model representation. Prog. Nucl. Energy 41 (1-4), 203-222. S.G. Isaev,V.M. Piksaikin,L.E. Kazakov, M.Z. Tarasko, Energy Dependence of Average Half-Life of Delayed Neutron Precursors in Fast Neutron Induced Fission of of U-235 and U-236 Proc. of XIV-th International Workshop on Nuclear Fission Physics, Obninsk, RUSSIA, 12-15 October 1998, ?.257-264. V.M. Piksaikin et al., Measurements of Periods, Relative Abundances and Absolute Total Yields of Delayed Neutrons From Fast Neutron Induced Fission of U-235 and Np-237, Proc. of the conf.: Nuclear data for science and technology, Trieste, Italy, 19-24 May, 1997, Conference proceedings, Bologna, Italy 1997, v.59, pp.485-487.

#	Half-life [s]	Relative abundance a(i)
1	54.8 ± 0.186	0.037 ± 0.0004
2	21.8 ± 0.094	0.227 ± 0.003
3	5.89 ± 0.059	0.185 ± 0.003
4	2.29 ± 0.023	0.400 ± 0.004
5	0.490 ± 0.010	0.127 ± 0.002
6	0.180 ± 0.004	0.025 ± 0.001

Average Half-life : 9.02 ± 0.07 s

Correlation matrix

	a1	T1	a2	T2	a3	T3	a4	T4	a5	T5	a6	T6
a1	1
T1	0	1
a2	0	0.82	1
T2	0	0.38	0.15	1
a3	0	0.32	0.26	0.38	1
T3	0	0.15	-0.19	0.65	-0.16	1
a4	0	0.66	0.55	0.61	-0.03	0.57	1
T4	0	0.13	0.17	0.1	-0.47	0.06	0.11	1
a5	0	0.1	0.09	0.08	0	0.03	-0.05	0.21	1
T5	0	0.06	0.06	0.06	0	0.04	-0.08	0.14	-0.01	1
a6	0	0.01	0.01	0.01	0	0	0	0.02	-0.01	0	1
T6	0	0.01	0.01	0.01	0	0	0	0.02	-0.01	0	0	1

#	Half-life [s]	Relative abundance a(i)
1	55.6 ± +/-	0.001 ±
2	24.5 ± +/-	0.006 ±
3	16.3 ± +/-	0.004 ±
4	5.21 ± +/-	0.007 ±
5	2.37 ± +/-	0.011 ±
6	1.04 ± +/-	0.003 ±
7	0.424 ± +/-	0.005 ±
8	0.195 ± +/-	0.001 ±

Average Half-life : 9.04 ± 0.18 s

Energy: 0.59 MeV

6-Groups
Original Model - Piksaikin, V.M., Kazakov, L.E., Isaev, S.G., Tarasko, M.Z., Roshchenko, V.A., Tertytchnyi, R.G., Springs, G.D., Campbell, J.M., 2002. Energy dependence of relative abundances and periods of delayed neutrons from neutron-induced fission of 235U, 238U, 239Pu in 6- and 8-group model representation. Prog. Nucl. Energy 41 (1-4), 203-222. S.G. Isaev,V.M. Piksaikin,L.E. Kazakov, M.Z. Tarasko, Energy Dependence of Average Half-Life of Delayed Neutron Precursors in Fast Neutron Induced Fission of of U-235 and U-236 Proc. of XIV-th International Workshop on Nuclear Fission Physics, Obninsk, RUSSIA, 12-15 October 1998, ?.257-264. V.M. Piksaikin et al., Measurements of Periods, Relative Abundances and Absolute Total Yields of Delayed Neutrons From Fast Neutron Induced Fission of U-235 and Np-237, Proc. of the conf.: Nuclear data for science and technology, Trieste, Italy, 19-24 May, 1997, Conference proceedings, Bologna, Italy 1997, v.59, pp.485-487.

#	Half-life [s]	Relative abundance a(i)
1	54.6 ± 0.216	0.037 ± 0.001
2	21.8 ± 0.110	0.225 ± 0.003
3	5.96 ± 0.068	0.189 ± 0.003
4	2.29 ± 0.028	0.393 ± 0.004
5	0.494 ± 0.010	0.130 ± 0.003
6	0.179 ± 0.004	0.026 ± 0.001

Average Half-life : 9.03 ± 0.08 s

Correlation matrix

	a1	T1	a2	T2	a3	T3	a4	T4	a5	T5	a6	T6
a1	1
T1	0	1
a2	0	0.77	1
T2	0	0.24	0.02	1
a3	0	0.28	0.21	0.39	1
T3	0	0.1	-0.26	0.62	-0.11	1
a4	0	0.6	0.51	0.54	-0.03	0.5	1
T4	0	0.15	0.18	0.16	-0.37	0.02	0.09	1
a5	0	0.08	0.07	0.06	0.01	0.03	-0.05	0.15	1
T5	0	0.06	0.05	0.05	0.01	0.04	-0.07	0.1	-0.01	1
a6	0	0.01	0.01	0	0	0	0	0.01	0	0	1
T6	0	0.01	0.01	0.01	0	0	0	0.02	-0.01	0	0	1

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.034 ± 0.001
2	24.5	0.145 ± 0.006
3	16.3	0.104 ± 0.004
4	5.21	0.184 ± 0.007
5	2.37	0.346 ± 0.011
6	1.04	0.062 ± 0.003
7	0.424	0.099 ± 0.005
8	0.195	0.026 ± 0.001

Average Half-life : 9.03 ± 0.18 s

Energy: 0.81 MeV

6-Groups
Original Model - Piksaikin, V.M., Kazakov, L.E., Isaev, S.G., Tarasko, M.Z., Roshchenko, V.A., Tertytchnyi, R.G., Springs, G.D., Campbell, J.M., 2002. Energy dependence of relative abundances and periods of delayed neutrons from neutron-induced fission of 235U, 238U, 239Pu in 6- and 8-group model representation. Prog. Nucl. Energy 41 (1-4), 203-222. S.G. Isaev,V.M. Piksaikin,L.E. Kazakov, M.Z. Tarasko, Energy Dependence of Average Half-Life of Delayed Neutron Precursors in Fast Neutron Induced Fission of of U-235 and U-236 Proc. of XIV-th International Workshop on Nuclear Fission Physics, Obninsk, RUSSIA, 12-15 October 1998, ?.257-264. V.M. Piksaikin et al., Measurements of Periods, Relative Abundances and Absolute Total Yields of Delayed Neutrons From Fast Neutron Induced Fission of U-235 and Np-237, Proc. of the conf.: Nuclear data for science and technology, Trieste, Italy, 19-24 May, 1997, Conference proceedings, Bologna, Italy 1997, v.59, pp.485-487.

#	Half-life [s]	Relative abundance a(i)
1	54.9 ± 0.155	0.036 ± 0.0004
2	21.9 ± 0.081	0.224 ± 0.002
3	5.88 ± 0.050	0.188 ± 0.003
4	2.23 ± 0.020	0.398 ± 0.003
5	0.488 ± 0.008	0.129 ± 0.002
6	0.180 ± 0.003	0.025 ± 0.0005

Average Half-life : 8.96 ± 0.06 s

Correlation matrix

	a1	T1	a2	T2	a3	T3	a4	T4	a5	T5	a6	T6
a1	1
T1	0	1
a2	0	0.82	1
T2	0	0.42	0.16	1
a3	0	0.33	0.27	0.38	1
T3	0	0.18	-0.17	0.68	-0.17	1
a4	0	0.66	0.54	0.64	-0.03	0.59	1
T4	0	0.13	0.16	0.1	-0.48	0.08	0.12	1
a5	0	0.1	0.1	0.08	0	0.03	-0.05	0.22	1
T5	0	0.06	0.05	0.06	0	0.04	-0.09	0.15	-0.01	1
a6	0	0.01	0.01	0.01	0	0	0	0.02	-0.01	0	1
T6	0	0.01	0.01	0.01	0	0	0	0.02	-0.01	0	0	1

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.033 ± 0.001
2	24.5	0.144 ± 0.006
3	16.3	0.104 ± 0.004
4	5.21	0.173 ± 0.007
5	2.37	0.351 ± 0.011
6	1.04	0.073 ± 0.004
7	0.424	0.095 ± 0.005
8	0.195	0.027 ± 0.001

Average Half-life : 8.91 ± 0.18 s

Energy: 1.01 MeV

6-Groups
Original Model - Piksaikin, V.M., Kazakov, L.E., Isaev, S.G., Tarasko, M.Z., Roshchenko, V.A., Tertytchnyi, R.G., Springs, G.D., Campbell, J.M., 2002. Energy dependence of relative abundances and periods of delayed neutrons from neutron-induced fission of 235U, 238U, 239Pu in 6- and 8-group model representation. Prog. Nucl. Energy 41 (1-4), 203-222. S.G. Isaev,V.M. Piksaikin,L.E. Kazakov, M.Z. Tarasko, Energy Dependence of Average Half-Life of Delayed Neutron Precursors in Fast Neutron Induced Fission of of U-235 and U-236 Proc. of XIV-th International Workshop on Nuclear Fission Physics, Obninsk, RUSSIA, 12-15 October 1998, ?.257-264. V.M. Piksaikin et al., Measurements of Periods, Relative Abundances and Absolute Total Yields of Delayed Neutrons From Fast Neutron Induced Fission of U-235 and Np-237, Proc. of the conf.: Nuclear data for science and technology, Trieste, Italy, 19-24 May, 1997, Conference proceedings, Bologna, Italy 1997, v.59, pp.485-487.

#	Half-life [s]	Relative abundance a(i)
1	54.7 ± 0.282	0.037 ± 0.001
2	21.9 ± 0.132	0.220 ± 0.004
3	5.86 ± 0.076	0.192 ± 0.004
4	2.27 ± 0.029	0.397 ± 0.005
5	0.499 ± 0.014	0.129 ± 0.004
6	0.180 ± 0.005	0.025 ± 0.001

Average Half-life : 8.90 ± 0.10 s

Correlation matrix

	a1	T1	a2	T2	a3	T3	a4	T4	a5	T5	a6	T6
a1	1
T1	0	1
a2	0	0.81	1
T2	0	0.32	0.15	1
a3	0	0.34	0.33	0.35	1
T3	0	0.15	-0.15	0.67	-0.23	1
a4	0	0.65	0.56	0.62	0.02	0.62	1
T4	0	0.11	0.12	0.09	-0.55	0.21	0.15	1
a5	0	0.11	0.11	0.08	-0.01	0.04	-0.03	0.25	1
T5	0	0.07	0.06	0.06	0	0.04	-0.09	0.17	0	1
a6	0	0.01	0.01	0.01	0	0	0.01	0.02	-0.01	0	1
T6	0	0.01	0.01	0.01	0	0	-0.01	0.02	-0.01	0	0	1

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.034 ± 0.001
2	24.5	0.144 ± 0.005
3	16.3	0.099 ± 0.004
4	5.21	0.183 ± 0.007
5	2.37	0.352 ± 0.011
6	1.04	0.067 ± 0.003
7	0.424	0.096 ± 0.005
8	0.195	0.025 ± 0.001

Average Half-life : 8.94 ± 0.16 s

Energy: 3.23 MeV

6-Groups
Original Model - Piksaikin, V.M., Kazakov, L.E., Isaev, S.G., Tarasko, M.Z., Roshchenko, V.A., Tertytchnyi, R.G., Springs, G.D., Campbell, J.M., 2002. Energy dependence of relative abundances and periods of delayed neutrons from neutron-induced fission of 235U, 238U, 239Pu in 6- and 8-group model representation. Prog. Nucl. Energy 41 (1-4), 203-222. S.G. Isaev,V.M. Piksaikin,L.E. Kazakov, M.Z. Tarasko, Energy Dependence of Average Half-Life of Delayed Neutron Precursors in Fast Neutron Induced Fission of of U-235 and U-236 Proc. of XIV-th International Workshop on Nuclear Fission Physics, Obninsk, RUSSIA, 12-15 October 1998, ?.257-264. V.M. Piksaikin et al., Measurements of Periods, Relative Abundances and Absolute Total Yields of Delayed Neutrons From Fast Neutron Induced Fission of U-235 and Np-237, Proc. of the conf.: Nuclear data for science and technology, Trieste, Italy, 19-24 May, 1997, Conference proceedings, Bologna, Italy 1997, v.59, pp.485-487.

#	Half-life [s]	Relative abundance a(i)
1	56.5 ± 0.593	0.038 ± 0.001
2	21.8 ± 0.291	0.211 ± 0.007
3	5.95 ± 0.161	0.194 ± 0.008
4	2.26 ± 0.065	0.411 ± 0.011
5	0.520 ± 0.026	0.122 ± 0.006
6	0.178 ± 0.009	0.025 ± 0.001

Average Half-life : 8.87 ± 0.45 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.039 ± 0.002
2	24.5	0.121 ± 0.005
3	16.3	0.115 ± 0.004
4	5.21	0.175 ± 0.007
5	2.37	0.368 ± 0.011
6	1.04	0.071 ± 0.004
7	0.424	0.087 ± 0.004
8	0.195	0.024 ± 0.001

Average Half-life : 8.91 ± 0.18 s

Energy: 3.75 MeV

6-Groups
Original Model - Piksaikin, V.M., Kazakov, L.E., Isaev, S.G., Tarasko, M.Z., Roshchenko, V.A., Tertytchnyi, R.G., Springs, G.D., Campbell, J.M., 2002. Energy dependence of relative abundances and periods of delayed neutrons from neutron-induced fission of 235U, 238U, 239Pu in 6- and 8-group model representation. Prog. Nucl. Energy 41 (1-4), 203-222. S.G. Isaev,V.M. Piksaikin,L.E. Kazakov, M.Z. Tarasko, Energy Dependence of Average Half-Life of Delayed Neutron Precursors in Fast Neutron Induced Fission of of U-235 and U-236 Proc. of XIV-th International Workshop on Nuclear Fission Physics, Obninsk, RUSSIA, 12-15 October 1998, ?.257-264. V.M. Piksaikin et al., Measurements of Periods, Relative Abundances and Absolute Total Yields of Delayed Neutrons From Fast Neutron Induced Fission of U-235 and Np-237, Proc. of the conf.: Nuclear data for science and technology, Trieste, Italy, 19-24 May, 1997, Conference proceedings, Bologna, Italy 1997, v.59, pp.485-487.

#	Half-life [s]	Relative abundance a(i)
1	55.6 ± 0.175	0.037 ± 0.0005
2	22.0 ± 0.085	0.204 ± 0.002
3	5.85 ± 0.049	0.196 ± 0.003
4	2.26 ± 0.019	0.412 ± 0.003
5	0.518 ± 0.010	0.125 ± 0.002
6	0.179 ± 0.004	0.025 ± 0.001

Average Half-life : 8.72 ± 0.06 s

Correlation matrix

	a1	T1	a2	T2	a3	T3	a4	T4	a5	T5	a6	T6
a1	1
T1	0	1
a2	0	0.76	1
T2	0	0.18	-0.01	1
a3	0	0.25	0.25	0.28	1
T3	0	0.06	-0.26	0.63	-0.33	1
a4	0	0.56	0.47	0.53	-0.15	0.59	1
T4	0	0.09	0.14	0.04	-0.59	0.16	0.15	1
a5	0	0.1	0.11	0.06	-0.02	0.02	-0.06	0.26	1
T5	0	0.05	0.05	0.04	-0.02	0.03	-0.12	0.18	-0.01	1
a6	0	0.01	0.01	0.01	0	0	0	0.02	-0.01	0	1
T6	0	0	0.01	0	0	0	-0.01	0.03	-0.01	0	0	1

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.036 ± 0.001
2	24.5	0.129 ± 0.005
3	16.3	0.096 ± 0.004
4	5.21	0.184 ± 0.007
5	2.37	0.367 ± 0.011
6	1.04	0.074 ± 0.004
7	0.424	0.089 ± 0.004
8	0.195	0.025 ± 0.001

Average Half-life : 8.67 ± 0.16 s

Energy: 4.20 MeV

6-Groups
Original Model - Piksaikin, V.M., Kazakov, L.E., Isaev, S.G., Tarasko, M.Z., Roshchenko, V.A., Tertytchnyi, R.G., Springs, G.D., Campbell, J.M., 2002. Energy dependence of relative abundances and periods of delayed neutrons from neutron-induced fission of 235U, 238U, 239Pu in 6- and 8-group model representation. Prog. Nucl. Energy 41 (1-4), 203-222. S.G. Isaev,V.M. Piksaikin,L.E. Kazakov, M.Z. Tarasko, Energy Dependence of Average Half-Life of Delayed Neutron Precursors in Fast Neutron Induced Fission of of U-235 and U-236 Proc. of XIV-th International Workshop on Nuclear Fission Physics, Obninsk, RUSSIA, 12-15 October 1998, ?.257-264. V.M. Piksaikin et al., Measurements of Periods, Relative Abundances and Absolute Total Yields of Delayed Neutrons From Fast Neutron Induced Fission of U-235 and Np-237, Proc. of the conf.: Nuclear data for science and technology, Trieste, Italy, 19-24 May, 1997, Conference proceedings, Bologna, Italy 1997, v.59, pp.485-487.

#	Half-life [s]	Relative abundance a(i)
1	55.8 ± 0.430	0.039 ± 0.001
2	21.7 ± 0.246	0.205 ± 0.006
3	5.77 ± 0.127	0.190 ± 0.008
4	2.25 ± 0.053	0.407 ± 0.009
5	0.516 ± 0.025	0.133 ± 0.006
6	0.179 ± 0.009	0.027 ± 0.001

Average Half-life : 8.72 ± 0.37 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.038 ± 0.002
2	24.5	0.121 ± 0.005
3	16.3	0.105 ± 0.004
4	5.21	0.171 ± 0.007
5	2.37	0.372 ± 0.011
6	1.04	0.069 ± 0.003
7	0.424	0.099 ± 0.005
8	0.195	0.025 ± 0.001

Average Half-life : 8.68 ± 0.18 s

Energy: 4.72 MeV

6-Groups
Original Model - Piksaikin, V.M., Kazakov, L.E., Isaev, S.G., Tarasko, M.Z., Roshchenko, V.A., Tertytchnyi, R.G., Springs, G.D., Campbell, J.M., 2002. Energy dependence of relative abundances and periods of delayed neutrons from neutron-induced fission of 235U, 238U, 239Pu in 6- and 8-group model representation. Prog. Nucl. Energy 41 (1-4), 203-222. S.G. Isaev,V.M. Piksaikin,L.E. Kazakov, M.Z. Tarasko, Energy Dependence of Average Half-Life of Delayed Neutron Precursors in Fast Neutron Induced Fission of of U-235 and U-236 Proc. of XIV-th International Workshop on Nuclear Fission Physics, Obninsk, RUSSIA, 12-15 October 1998, ?.257-264. V.M. Piksaikin et al., Measurements of Periods, Relative Abundances and Absolute Total Yields of Delayed Neutrons From Fast Neutron Induced Fission of U-235 and Np-237, Proc. of the conf.: Nuclear data for science and technology, Trieste, Italy, 19-24 May, 1997, Conference proceedings, Bologna, Italy 1997, v.59, pp.485-487.

#	Half-life [s]	Relative abundance a(i)
1	55.5 ± 0.240	0.039 ± 0.001
2	21.7 ± 0.110	0.200 ± 0.003
3	5.84 ± 0.056	0.187 ± 0.003
4	2.29 ± 0.021	0.422 ± 0.004
5	0.499 ± 0.010	0.126 ± 0.002
6	0.178 ± 0.004	0.026 ± 0.001

Average Half-life : 8.62 ± 0.07 s

Correlation matrix

	a1	T1	a2	T2	a3	T3	a4	T4	a5	T5	a6	T6
a1	1
T1	0	1
a2	0	0.8	1
T2	0	0.26	0.09	1
a3	0	0.29	0.29	0.33	1
T3	0	0.13	-0.18	0.67	-0.23	1
a4	0	0.63	0.56	0.6	-0.02	0.61	1
T4	0	0.14	0.18	0.09	-0.52	0.14	0.16	1
a5	0	0.09	0.09	0.06	0	0.03	-0.02	0.2	1
T5	0	0.07	0.07	0.06	0	0.03	-0.07	0.18	-0.01	1
a6	0	0	0	0	0	0	0	0.01	0	0	1
T6	0	0.01	0.01	0	0	0	0	0.02	-0.01	0	0	1

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.038 ± 0.001
2	24.5	0.120 ± 0.005
3	16.3	0.101 ± 0.004
4	5.21	0.175 ± 0.007
5	2.37	0.385 ± 0.011
6	1.04	0.059 ± 0.003
7	0.424	0.097 ± 0.005
8	0.195	0.025 ± 0.001

Average Half-life : 8.63 ± 0.16 s

236U

Energy: Fission Spectrum

#	Half-life [s]	Relative abundance a(i)
1	55.5 ± 0.000	0.027 ± 0.005
2	20.5 ± 0.000	0.193 ± 0.028
3	4.99 ± 0.000	0.179 ± 0.036
4	2.09 ± 0.000	0.432 ± 0.077
5	0.654 ± 0.000	0.132 ± 0.025
6	0.278 ± 0.000	0.037 ± 0.015

Average Half-life : 7.34 ± .67 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.025 ± 0.004
2	24.5	0.098 ± 0.018
3	16.3	0.108 ± 0.023
4	5.21	0.127 ± 0.026
5	2.37	0.410 ± 0.075
6	1.04	0.137 ± 0.035
7	0.424	0.088 ± 0.017
8	0.195	0.008 ± 0.010

Average Half-life : 7.33 ± .66 s

Energy: 1.2 MeV 6-groups

#	Half-life [s]	Relative abundance a(i)
1	54.6 ± 0.369	0.025 ± 0.0005
2	21.7 ± 0.129	0.213 ± 0.004
3	4.29 ± 0.049	0.337 ± 0.006
4	1.42 ± 0.033	0.314 ± 0.007
5	0.479 ± 0.014	0.098 ± 0.003
6	0.214 ± 0.006	0.012 ± 0.0004

Average Half-life : 7.93 ± 0.10 s

Correlation matrix

	a1	T1	a2	T2	a3	T3	a4	T4	a5	T5	a6	T6
a1	1
T1	0	1
a2	0	0.77	1
T2	0	0.07	0.11	1
a3	0	0.47	0.59	0.41	1
T3	0	-0.03	-0.2	0.56	-0.27	1
a4	0	0.37	0.41	0.38	-0.03	0.5	1
T4	0	0.09	0.13	0.04	-0.35	0.12	0.09	1
a5	0	0.06	0.06	0.05	0.02	0.06	-0.05	0.08	1
T5	0	0.04	0.05	0.05	0.01	0.07	-0.05	0.03	-0.01	1
a6	0	0	0	0	0	0	0	0.01	0	0	1
T6	0	0	0	0	0	0	0	0.01	0	0	0	1

8-Groups
Expanded Model using a fixed set of Half-lives

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.022 ± 0.001
2	24.5	0.143 ± 0.006
3	16.3	0.079 ± 0.003
4	5.21	0.196 ± 0.007
5	2.37	0.287 ± 0.009
6	1.04	0.200 ± 0.009
7	0.424	0.049 ± 0.002
8	0.195	0.023 ± 0.001

Average Half-life : 7.94 ± .16 s

Energy: 3.5 MeV 6-groups

#	Half-life [s]	Relative abundance a(i)
1	55.4 ± 0.554	0.025 ± 0.001
2	22.3 ± 0.220	0.195 ± 0.005
3	4.29 ± 0.071	0.353 ± 0.008
4	1.48 ± 0.045	0.317 ± 0.009
5	0.477 ± 0.017	0.098 ± 0.003
6	0.214 ± 0.008	0.012 ± 0.0004

Average Half-life : 7.75 ± 0.13 s

Correlation matrix

	a1	T1	a2	T2	a3	T3	a4	T4	a5	T5	a6	T6
a1	1
T1	0	1
a2	0	0.65	1
T2	0	-0.13	-0.08	1
a3	0	0.36	0.5	0.4	1
T3	0	-0.05	-0.25	0.54	-0.18	1
a4	0	0.26	0.33	0.27	-0.05	0.4	1
T4	0	0.09	0.15	0.05	-0.25	0.04	0.04	1
a5	0	0.04	0.05	0.04	0.01	0.05	-0.04	0.05	1
T5	0	0.03	0.04	0.04	0	0.06	-0.03	0.02	0	1
a6	0	0	0	0	0	0	0	0	0	0	1
T6	0	0	0	0	0	0	0	0	0	0	0	1

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.023 ± 0.001
2	24.5	0.144 ± 0.005
3	16.3	0.055 ± 0.003
4	5.21	0.209 ± 0.007
5	2.37	0.309 ± 0.010
6	1.04	0.185 ± 0.008
7	0.424	0.049 ± 0.002
8	0.195	0.024 ± 0.001

Average Half-life : 7.75 ± .15 s

Energy: 4 MeV 6-groups

#	Half-life [s]	Relative abundance a(i)
1	55.8 ± 0.375	0.026 ± 0.001
2	21.9 ± 0.142	0.195 ± 0.004
3	4.50 ± 0.053	0.322 ± 0.006
4	1.50 ± 0.036	0.347 ± 0.008
5	0.484 ± 0.017	0.099 ± 0.003
6	0.214 ± 0.008	0.013 ± 0.0005

Average Half-life : 7.71 ± 0.11 s

Correlation matrix

	a1	T1	a2	T2	a3	T3	a4	T4	a5	T5	a6	T6
a1	1
T1	0	1
a2	0	0.86	1
T2	0	0.3	0.29	1
a3	0	0.56	0.64	0.4	1
T3	0	0.04	-0.12	0.56	-0.36	1
a4	0	0.5	0.49	0.52	0	0.61	1
T4	0	0.05	0.06	0.03	-0.48	0.27	0.18	1
a5	0	0.08	0.08	0.08	0.02	0.06	-0.07	0.15	1
T5	0	0.06	0.06	0.06	0.02	0.07	-0.07	0.04	0	1
a6	0	0.01	0.01	0	0	0	0	0.01	0	0	1
T6	0	0.01	0.01	0	0	0	0	0.01	0	0	0	1

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.024 ± 0.001
2	24.5	0.129 ± 0.005
3	16.3	0.075 ± 0.003
4	5.21	0.201 ± 0.007
5	2.37	0.291 ± 0.009
6	1.04	0.215 ± 0.009
7	0.424	0.042 ± 0.003
8	0.195	0.023 ± 0.001

Average Half-life : 7.72 ± 0.15 s

Energy: 4.5 MeV 6-groups

#	Half-life [s]	Relative abundance a(i)
1	56.7 ± 0.696	0.025 ± 0.001
2	21.7 ± 0.285	0.197 ± 0.007
3	4.22 ± 0.097	0.329 ± 0.010
4	1.35 ± 0.056	0.337 ± 0.013
5	0.484 ± 0.024	0.100 ± 0.005
6	0.214 ± 0.011	0.013 ± 0.001

Average Half-life : 7.58 ± 0.12 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.025 ± 0.001
2	24.5	0.120 ± 0.005
3	16.3	0.083 ± 0.003
4	5.21	0.175 ± 0.007
5	2.37	0.291 ± 0.009
6	1.04	0.223 ± 0.009
7	0.424	0.058 ± 0.004
8	0.195	0.025 ± 0.001

Average Half-life : 7.56 ± .15 s

Energy: 5 MeV 6-groups

#	Half-life [s]	Relative abundance a(i)
1	55.4 ± 0.420	0.026 ± 0.001
2	21.6 ± 0.152	0.191 ± 0.004
3	4.32 ± 0.053	0.332 ± 0.006
4	1.40 ± 0.036	0.332 ± 0.008
5	0.456 ± 0.016	0.106 ± 0.004
6	0.215 ± 0.008	0.013 ± 0.0005

Average Half-life : 7.51 ± 0.11 s

Correlation matrix

	a1	T1	a2	T2	a3	T3	a4	T4	a5	T5	a6	T6
a1	1
T1	0	1
a2	0	0.86	1
T2	0	0.25	0.25	1
a3	0	0.55	0.63	0.38	1
T3	0	0.03	-0.13	0.56	-0.37	1
a4	0	0.5	0.49	0.51	0.01	0.61	1
T4	0	0.06	0.06	0.05	-0.47	0.31	0.18	1
a5	0	0.08	0.09	0.07	0.02	0.05	-0.07	0.13	1
T5	0	0.05	0.05	0.06	0.02	0.06	-0.08	0.04	0	1
a6	0	0.01	0.01	0.01	0	0	0	0.01	0	0	1
T6	0	0.01	0.01	0.01	0	0	0	0.01	0	0	0	1

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.024 ± 0.001
2	24.5	0.122 ± 0.005
3	16.3	0.077 ± 0.003
4	5.21	0.191 ± 0.007
5	2.37	0.295 ± 0.009
6	1.04	0.195 ± 0.009
7	0.424	0.080 ± 0.004
8	0.195	0.017 ± 0.001

Average Half-life : 7.50 ± 0.15 s

237NP

Energy: Fast Spectrum

6-Groups
Original Model - R. W. WALDO, R. A. KARAM, R. A. MEYER, Delayed Neutron Yields: Time Dependent Measurements and a Predictive Model, Physical Review C, 23, No. 3, 1113 (March 1981). R. W. WALDO, and R. A. KARAM, Measured Delayed Neutron Yields, Trans. Amer. Nucl. Soc., 39, 879 (1981).

#	Half-life [s]	Relative abundance a(i)
1	55.1 ± 0.180	0.035 ± 0.003
2	22.7 ± 0.250	0.230 ± 0.023
3	10.6 ± 2.600	0.066 ± 0.031
4	4.99 ± 0.680	0.144 ± 0.061
5	2.11 ± 0.190	0.400 ± 0.050
6	0.428 ± 0.180	0.125 ± 0.028

Average Half-life : 9.46 ± .75 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.035 ± 0.004
2	24.5	0.142 ± 0.015
3	16.3	0.146 ± 0.031
4	5.21	0.112 ± 0.064
5	2.37	0.406 ± 0.047
6	1.04	0.040 ± 0.026
7	0.424	0.118 ± 0.014

Average Half-life : 9.46 ± .75 s

#	Half-life [s]	Relative abundance a(i)
1	54.6 ± 0.860	0.046 ± 0.003
2	21.8 ± 0.410	0.288 ± 0.008
3	5.64 ± 0.092	0.233 ± 0.008
4	2.18 ± 0.027	0.422 ± 0.013
5	0.673 ± 0.110	0.012 ± 0.001

Average Half-life : 11.00 ± .28 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.044 ± 0.003
2	24.5	0.162 ± 0.008
3	16.3	0.164 ± 0.003
4	5.21	0.161 ± 0.008
5	2.37	0.439 ± 0.013
6	1.04	0.025 ± 0.001
7	0.424	0.005 ± 0.002

Average Half-life : 11.01 ± .28 s

Energy: Fission Spectrum

#	Half-life [s]	Relative abundance a(i)
1	55.9 ± 0.000	0.042 ± 0.009
2	22.2 ± 0.000	0.233 ± 0.030
3	5.42 ± 0.000	0.190 ± 0.028
4	2.29 ± 0.000	0.359 ± 0.051
5	0.619 ± 0.000	0.145 ± 0.019
6	0.210 ± 0.000	0.031 ± 0.014

Average Half-life : 9.45 ± .87 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.039 ± 0.009
2	24.5	0.174 ± 0.024
3	16.3	0.068 ± 0.020
4	5.21	0.194 ± 0.025
5	2.37	0.309 ± 0.051
6	1.04	0.112 ± 0.014
7	0.424	0.086 ± 0.017
8	0.195	0.019 ± 0.011

Average Half-life : 9.45 ± .86 s

Energy: TRIGA Reactor Spectrum

#	Half-life [s]	Relative abundance a(i)
1	53.7 ± 2.500	0.041 ± 0.002
2	21.4 ± 0.730	0.238 ± 0.017
3	6.60 ± 0.130	0.194 ± 0.010
4	2.03 ± 0.077	0.329 ± 0.028
5	0.815 ± 0.058	0.197 ± 0.007

Average Half-life : 9.41 ± .44 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.036 ± 0.004
2	24.5	0.137 ± 0.014
3	16.3	0.142 ± 0.010
4	5.21	0.183 ± 0.009
5	2.37	0.200 ± 0.027
6	1.04	0.285 ± 0.009
7	0.424	0.016 ± 0.004

Average Half-life : 9.40 ± .44 s

Energy: fast spectrum

6-Groups
Original Model - D. LOAIZA, Measurement of Delayed-Neutron Parameters for 235U and 237Np, Ph.D. Dissertation, University of New Mexico, Albuquerque, NM (1997).

#	Half-life [s]	Relative abundance a(i)
1	56.4 ± 4.100	0.032 ± 0.003
2	24.4 ± 0.430	0.238 ± 0.006
3	7.15 ± 0.520	0.175 ± 0.008
4	2.34 ± 0.110	0.360 ± 0.017
5	0.762 ± 0.049	0.150 ± 0.014
6	0.217 ± 0.009	0.045 ± 0.006

Average Half-life : 9.83 ± .30 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.036 ± 0.005
2	24.5	0.199 ± 0.004
3	16.3	0.073 ± 0.006
4	5.21	0.187 ± 0.014
5	2.37	0.263 ± 0.005
6	1.04	0.162 ± 0.016
7	0.424	0.050 ± 0.009
8	0.195	0.031 ± 0.001

Average Half-life : 9.84 ± .30 s

Energy: Fast Spectrum

6-Groups
Original Model - W. S. CHARLTON, Delayed Neutron Emission Measurements from Fast Fission of Actinide Waste Isotopes, Master�s Thesis, Texas A&M University (August, 1998).

#	Half-life [s]	Relative abundance a(i)
1	55.9 ± 1.400	0.031 ± 0.002
2	24.5 ± 0.610	0.164 ± 0.011
3	17.0 ± 0.330	0.096 ± 0.005
4	4.20 ± 0.051	0.328 ± 0.019
5	1.65 ± 0.024	0.291 ± 0.014
6	0.830 ± 0.030	0.090 ± 0.014

Average Half-life : 9.34 ± .33 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.030 ± 0.003
2	24.5	0.184 ± 0.011
3	16.3	0.067 ± 0.001
4	5.21	0.214 ± 0.015
5	2.37	0.311 ± 0.017
6	1.04	0.191 ± 0.014
7	0.424	0.003 ± 0.007

Average Half-life : 9.33 ± .32 s

7-Groups
Original Model - W. S. CHARLTON, Delayed Neutron Emission Measurements from Fast Fission of Actinide Waste Isotopes, Master�s Thesis, Texas A&M University (August, 1998).

#	Half-life [s]	Relative abundance a(i)
1	55.9 ± 1.400	0.031 ± 0.002
2	24.5 ± 0.610	0.160 ± 0.010
3	16.9 ± 0.330	0.083 ± 0.004
4	4.47 ± 0.058	0.284 ± 0.016
5	1.75 ± 0.026	0.322 ± 0.013
6	0.820 ± 0.029	0.088 ± 0.010
7	0.272 ± 0.003	0.032 ± 0.008

Average Half-life : 8.95 ± .30 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.031 ± 0.003
2	24.5	0.163 ± 0.010
3	16.3	0.079 ± 0.002
4	5.21	0.185 ± 0.014
5	2.37	0.329 ± 0.015
6	1.04	0.169 ± 0.008
7	0.424	0.030 ± 0.010
8	0.195	0.014 ± 0.004

Average Half-life : 8.95 ± .30 s

Energy: 0.4 MeV

4-Groups
Original Model - B. P. MAKSYUTENKO, Y. F. BALASKSHEV, and G. I. VOLKOVA, Relative Yields of Delayed Neutrons in Fission of 237Np by 0.4�1.2 MeV Neutrons, Sov. J. Nucl Phys., 19, No. 4, 380 (October, 1974).

#	Half-life [s]	Relative abundance a(i)
1	54.3 ± 0.000	0.031 ± 0.003
2	23.0 ± 0.000	0.230 ± 0.007
3	5.60 ± 0.000	0.263 ± 0.012
4	2.13 ± 0.000	0.477 ± 0.034

Average Half-life : 9.44 ± .25 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.033 ± 0.003
2	24.5	0.137 ± 0.005
3	16.3	0.131 ± 0.006
4	5.21	0.170 ± 0.008
5	2.37	0.505 ± 0.034
6	1.04	0.023 ± 0.010

Average Half-life : 9.46 ± .24 s

Energy: 0.5 MeV

#	Half-life [s]	Relative abundance a(i)
1	54.3 ± 0.000	0.029 ± 0.003
2	23.0 ± 0.000	0.234 ± 0.006
3	5.60 ± 0.000	0.246 ± 0.009
4	2.13 ± 0.000	0.491 ± 0.026

Average Half-life : 9.38 ± .22 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.032 ± 0.003
2	24.5	0.141 ± 0.005
3	16.3	0.132 ± 0.005
4	5.21	0.151 ± 0.006
5	2.37	0.521 ± 0.026
6	1.04	0.024 ± 0.008

Average Half-life : 9.39 ± .22 s

Energy: 0.586 MeV

6-Groups
Original Model - V.M. Piksaikin, Yu.F. Balakshev,S.G. Isaev, L.E. Kazakov, G.G. Korolev, V.I. Mil'shin, Measurement of the Energy Dependence of the Parameters of Delayed Neutrons Accompanying Fission of Np-237 by Fast Neutrons, Atomic Energy, 1998, v.85, ?1, pp.479-486.

#	Half-life [s]	Relative abundance a(i)
1	56.4 ± 0.560	0.032 ± 0.001
2	22.0 ± 0.260	0.284 ± 0.008
3	5.09 ± 0.170	0.193 ± 0.009
4	2.26 ± 0.060	0.381 ± 0.015
5	0.433 ± 0.020	0.095 ± 0.004
6	0.197 ± 0.010	0.016 ± 0.001

Average Half-life : 9.93 ± .21 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.030 ± 0.001
2	24.5	0.196 ± 0.007
3	16.3	0.100 ± 0.004
4	5.21	0.155 ± 0.011
5	2.37	0.398 ± 0.012
6	1.04	0.012 ± 0.007
7	0.424	0.093 ± 0.002
8	0.195	0.015 ± 0.002

Average Half-life : 9.92 ± .21 s

8-Groups
Original Model - V.M. Piksaikin, Yu.F. Balakshev,S.G. Isaev, L.E. Kazakov, G.G. Korolev, V.I. Mil'shin, Measurement of the Energy Dependence of the Parameters of Delayed Neutrons Accompanying Fission of Np-237 by Fast Neutrons, Atomic Energy, 1998, v.85, ?1, pp.479-486.

#	Half-life [s]	Relative abundance a(i)
1	55.7 ± 0.000	0.030 ± 0.001
2	24.5 ± 0.000	0.180 ± 0.004
3	16.3 ± 0.000	0.106 ± 0.003
4	5.21 ± 0.000	0.159 ± 0.004
5	2.37 ± 0.000	0.361 ± 0.006
6	1.04 ± 0.000	0.018 ± 0.001
7	0.424 ± 0.000	0.125 ± 0.004
8	0.195 ± 0.000	0.022 ± 0.001

Average Half-life : 9.55 ± .12 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.030 ± 0.001
2	24.5	0.180 ± 0.004
3	16.3	0.106 ± 0.003
4	5.21	0.158 ± 0.004
5	2.37	0.362 ± 0.006
6	1.04	0.018 ± 0.000
7	0.424	0.125 ± 0.004
8	0.195	0.022 ± 0.001

Average Half-life : 9.55 ± .12 s

Energy: 0.6 MeV

#	Half-life [s]	Relative abundance a(i)
1	54.3 ± 0.000	0.032 ± 0.003
2	23.0 ± 0.000	0.242 ± 0.004
3	5.60 ± 0.000	0.264 ± 0.006
4	2.13 ± 0.000	0.463 ± 0.016

Average Half-life : 9.74 ± .19 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.034 ± 0.003
2	24.5	0.149 ± 0.003
3	16.3	0.132 ± 0.003
4	5.21	0.173 ± 0.004
5	2.37	0.490 ± 0.016
6	1.04	0.023 ± 0.005

Average Half-life : 9.76 ± .19 s

Energy: 0.7 MeV

#	Half-life [s]	Relative abundance a(i)
1	54.3 ± 0.000	0.033 ± 0.003
2	23.0 ± 0.000	0.247 ± 0.006
3	5.60 ± 0.000	0.245 ± 0.014
4	2.13 ± 0.000	0.476 ± 0.026

Average Half-life : 9.85 ± .24 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.035 ± 0.003
2	24.5	0.153 ± 0.004
3	16.3	0.132 ± 0.005
4	5.21	0.152 ± 0.012
5	2.37	0.505 ± 0.025
6	1.04	0.023 ± 0.008

Average Half-life : 9.87 ± .24 s

Energy: 0.8 MeV

#	Half-life [s]	Relative abundance a(i)
1	54.3 ± 0.000	0.033 ± 0.003
2	23.0 ± 0.000	0.245 ± 0.003
3	5.60 ± 0.000	0.257 ± 0.005
4	2.13 ± 0.000	0.464 ± 0.013

Average Half-life : 9.88 ± .19 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.035 ± 0.003
2	24.5	0.152 ± 0.003
3	16.3	0.132 ± 0.002
4	5.21	0.166 ± 0.003
5	2.37	0.492 ± 0.013
6	1.04	0.023 ± 0.004

Average Half-life : 9.90 ± .19 s

Energy: 0.9 MeV

#	Half-life [s]	Relative abundance a(i)
1	54.3 ± 0.000	0.034 ± 0.003
2	23.0 ± 0.000	0.254 ± 0.002
3	5.60 ± 0.000	0.294 ± 0.003
4	2.13 ± 0.000	0.419 ± 0.008

Average Half-life : 10.20 ± .19 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.035 ± 0.003
2	24.5	0.161 ± 0.003
3	16.3	0.132 ± 0.003
4	5.21	0.211 ± 0.004
5	2.37	0.441 ± 0.009
6	1.04	0.021 ± 0.0001

Average Half-life : 10.21 ± .17 s

Energy: 1.0 MeV

#	Half-life [s]	Relative abundance a(i)
1	54.3 ± 0.000	0.034 ± 0.003
2	23.0 ± 0.000	0.247 ± 0.003
3	5.60 ± 0.000	0.279 ± 0.005
4	2.13 ± 0.000	0.440 ± 0.020

Average Half-life : 10.04 ± .21 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.036 ± 0.003
2	24.5	0.155 ± 0.003
3	16.3	0.131 ± 0.003
4	5.21	0.192 ± 0.004
5	2.37	0.464 ± 0.019
6	1.04	0.022 ± 0.008

Average Half-life : 10.06 ± .21 s

Energy: 1.008 MeV

#	Half-life [s]	Relative abundance a(i)
1	55.3 ± 0.940	0.031 ± 0.001
2	22.7 ± 0.240	0.246 ± 0.007
3	6.53 ± 0.200	0.167 ± 0.007
4	2.37 ± 0.060	0.397 ± 0.009
5	0.483 ± 0.027	0.144 ± 0.007
6	0.202 ± 0.010	0.016 ± 0.001

Average Half-life : 9.40 ± .19 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.030 ± 0.002
2	24.5	0.178 ± 0.006
3	16.3	0.097 ± 0.006
4	5.21	0.175 ± 0.008
5	2.37	0.337 ± 0.007
6	1.04	0.051 ± 0.004
7	0.424	0.124 ± 0.006
8	0.195	0.010 ± 0.000

Average Half-life : 9.39 ± .19 s

#	Half-life [s]	Relative abundance a(i)
1	55.7 ± 0.000	0.030 ± 0.001
2	24.5 ± 0.000	0.174 ± 0.003
3	16.3 ± 0.000	0.100 ± 0.002
4	5.21 ± 0.000	0.164 ± 0.003
5	2.37 ± 0.000	0.362 ± 0.005
6	1.04 ± 0.000	0.018 ± 0.001
7	0.424 ± 0.000	0.129 ± 0.004
8	0.195 ± 0.000	0.022 ± 0.001

Average Half-life : 9.37 ± .09 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.031 ± 0.001
2	24.5	0.173 ± 0.003
3	16.3	0.100 ± 0.002
4	5.21	0.163 ± 0.003
5	2.37	0.363 ± 0.005
6	1.04	0.018 ± 0.000
7	0.424	0.129 ± 0.004
8	0.195	0.022 ± 0.001

Average Half-life : 9.37 ± .09 s

Energy: 1.1 MeV

#	Half-life [s]	Relative abundance a(i)
1	54.3 ± 0.000	0.030 ± 0.003
2	23.0 ± 0.000	0.224 ± 0.003
3	5.60 ± 0.000	0.247 ± 0.005
4	2.13 ± 0.000	0.499 ± 0.015

Average Half-life : 9.23 ± .18 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.033 ± 0.003
2	24.5	0.132 ± 0.003
3	16.3	0.131 ± 0.002
4	5.21	0.150 ± 0.003
5	2.37	0.530 ± 0.015
6	1.04	0.024 ± 0.004

Average Half-life : 9.25 ± .18 s

Energy: 1.2 MeV

#	Half-life [s]	Relative abundance a(i)
1	54.3 ± 0.000	0.030 ± 0.003
2	23.0 ± 0.000	0.220 ± 0.005
3	5.60 ± 0.000	0.265 ± 0.009
4	2.13 ± 0.000	0.485 ± 0.042

Average Half-life : 9.21 ± .23 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.033 ± 0.003
2	24.5	0.129 ± 0.005
3	16.3	0.130 ± 0.003
4	5.21	0.171 ± 0.003
5	2.37	0.514 ± 0.041
6	1.04	0.024 ± 0.014

Average Half-life : 9.22 ± .23 s

#	Half-life [s]	Relative abundance a(i)
1	55.3 ± 0.940	0.031 ± 0.001
2	22.7 ± 0.240	0.246 ± 0.007
3	6.53 ± 0.200	0.167 ± 0.007
4	2.37 ± 0.060	0.397 ± 0.009
5	0.483 ± 0.027	0.144 ± 0.007
6	0.202 ± 0.010	0.016 ± 0.001

Average Half-life : 9.40 ± .19 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.030 ± 0.002
2	24.5	0.178 ± 0.006
3	16.3	0.097 ± 0.006
4	5.21	0.175 ± 0.008
5	2.37	0.337 ± 0.007
6	1.04	0.051 ± 0.004
7	0.424	0.124 ± 0.006
8	0.195	0.010 ± 0.000

Average Half-life : 9.39 ± .19 s

#	Half-life [s]	Relative abundance a(i)
1	55.7 ± 0.000	0.030 ± 0.001
2	24.5 ± 0.000	0.172 ± 0.004
3	16.3 ± 0.000	0.103 ± 0.003
4	5.21 ± 0.000	0.163 ± 0.004
5	2.37 ± 0.000	0.364 ± 0.006
6	1.04 ± 0.000	0.018 ± 0.001
7	0.424 ± 0.000	0.128 ± 0.006
8	0.195 ± 0.000	0.022 ± 0.001

Average Half-life : 9.35 ± .13 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.030 ± 0.001
2	24.5	0.172 ± 0.004
3	16.3	0.103 ± 0.003
4	5.21	0.163 ± 0.004
5	2.37	0.364 ± 0.006
6	1.04	0.018 ± 0.001
7	0.424	0.128 ± 0.006
8	0.195	0.022 ± 0.001

Average Half-life : 9.35 ± .13 s

Energy: 3.23 MeV

#	Half-life [s]	Relative abundance a(i)
1	55.2 ± 0.550	0.040 ± 0.001
2	21.9 ± 0.260	0.247 ± 0.007
3	4.71 ± 0.160	0.184 ± 0.008
4	2.79 ± 0.070	0.356 ± 0.014
5	0.579 ± 0.027	0.142 ± 0.007
6	0.211 ± 0.011	0.031 ± 0.002

Average Half-life : 9.57 ± .19 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.032 ± 0.001
2	24.5	0.215 ± 0.006
3	16.3	0.019 ± 0.003
4	5.21	0.256 ± 0.012
5	2.37	0.317 ± 0.011
6	1.04	0.032 ± 0.007
7	0.424	0.114 ± 0.003
8	0.195	0.014 ± 0.003

Average Half-life : 9.55 ± .19 s

Energy: 3.745 MeV

#	Half-life [s]	Relative abundance a(i)
1	54.7 ± 0.550	0.040 ± 0.001
2	21.8 ± 0.260	0.228 ± 0.006
3	5.74 ± 0.190	0.191 ± 0.009
4	2.26 ± 0.056	0.395 ± 0.016
5	0.719 ± 0.034	0.116 ± 0.005
6	0.199 ± 0.010	0.030 ± 0.002

Average Half-life : 9.24 ± .17 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.036 ± 0.001
2	24.5	0.155 ± 0.005
3	16.3	0.092 ± 0.004
4	5.21	0.189 ± 0.011
5	2.37	0.337 ± 0.013
6	1.04	0.129 ± 0.008
7	0.424	0.038 ± 0.001
8	0.195	0.024 ± 0.002

Average Half-life : 9.23 ± .17 s

#	Half-life [s]	Relative abundance a(i)
1	55.7 ± 0.000	0.035 ± 0.001
2	24.5 ± 0.000	0.149 ± 0.003
3	16.3 ± 0.000	0.089 ± 0.002
4	5.21 ± 0.000	0.167 ± 0.003
5	2.37 ± 0.000	0.373 ± 0.004
6	1.04 ± 0.000	0.021 ± 0.001
7	0.424 ± 0.000	0.141 ± 0.004
8	0.195 ± 0.000	0.025 ± 0.001

Average Half-life : 8.87 ± .09 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.035 ± 0.001
2	24.5	0.149 ± 0.003
3	16.3	0.089 ± 0.002
4	5.21	0.167 ± 0.003
5	2.37	0.373 ± 0.004
6	1.04	0.021 ± 0.001
7	0.424	0.141 ± 0.004
8	0.195	0.026 ± 0.001

Average Half-life : 8.87 ± .09 s

Energy: 4.196 MeV

#	Half-life [s]	Relative abundance a(i)
1	54.7 ± 0.550	0.045 ± 0.001
2	21.0 ± 0.250	0.234 ± 0.007
3	4.96 ± 0.170	0.222 ± 0.010
4	2.24 ± 0.056	0.336 ± 0.013
5	0.845 ± 0.040	0.131 ± 0.006
6	0.203 ± 0.010	0.032 ± 0.002

Average Half-life : 9.35 ± .18 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.039 ± 0.001
2	24.5	0.151 ± 0.005
3	16.3	0.092 ± 0.006
4	5.21	0.197 ± 0.011
5	2.37	0.329 ± 0.011
6	1.04	0.140 ± 0.007
7	0.424	0.026 ± 0.001
8	0.195	0.026 ± 0.002

Average Half-life : 9.34 ± .18 s

#	Half-life [s]	Relative abundance a(i)
1	55.7 ± 0.000	0.035 ± 0.001
2	24.5 ± 0.000	0.147 ± 0.004
3	16.3 ± 0.000	0.090 ± 0.003
4	5.21 ± 0.000	0.170 ± 0.003
5	2.37 ± 0.000	0.374 ± 0.005
6	1.04 ± 0.000	0.021 ± 0.001
7	0.424 ± 0.000	0.139 ± 0.004
8	0.195 ± 0.000	0.026 ± 0.001

Average Half-life : 8.87 ± .11 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.035 ± 0.001
2	24.5	0.147 ± 0.004
3	16.3	0.090 ± 0.003
4	5.21	0.170 ± 0.003
5	2.37	0.374 ± 0.005
6	1.04	0.021 ± 0.001
7	0.424	0.139 ± 0.004
8	0.195	0.026 ± 0.001

Average Half-life : 8.87 ± .11 s

Energy: 4.719 MeV

#	Half-life [s]	Relative abundance a(i)
1	53.2 ± 0.530	0.046 ± 0.001
2	21.0 ± 0.250	0.220 ± 0.006
3	5.18 ± 0.180	0.199 ± 0.009
4	2.38 ± 0.060	0.357 ± 0.014
5	0.707 ± 0.033	0.145 ± 0.007
6	0.206 ± 0.010	0.033 ± 0.002

Average Half-life : 9.06 ± .17 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.036 ± 0.001
2	24.5	0.159 ± 0.005
3	16.3	0.068 ± 0.005
4	5.21	0.217 ± 0.011
5	2.37	0.312 ± 0.011
6	1.04	0.124 ± 0.008
7	0.424	0.062 ± 0.001
8	0.195	0.022 ± 0.003

Average Half-life : 9.05 ± .17 s

#	Half-life [s]	Relative abundance a(i)
1	55.7 ± 0.000	0.035 ± 0.001
2	24.5 ± 0.000	0.144 ± 0.004
3	16.3 ± 0.000	0.084 ± 0.002
4	5.21 ± 0.000	0.176 ± 0.003
5	2.37 ± 0.000	0.374 ± 0.005
6	1.04 ± 0.000	0.021 ± 0.001
7	0.424 ± 0.000	0.141 ± 0.004
8	0.195 ± 0.000	0.026 ± 0.001

Average Half-life : 8.72 ± .11 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.035 ± 0.001
2	24.5	0.144 ± 0.004
3	16.3	0.084 ± 0.002
4	5.21	0.176 ± 0.003
5	2.37	0.374 ± 0.005
6	1.04	0.021 ± 0.001
7	0.424	0.141 ± 0.004
8	0.195	0.026 ± 0.001

Average Half-life : 8.72 ± .11 s

Energy: 14.23 MeV

6-Groups
Original Model - Gremyachkin D.E., Piksaikin V.M., Egorov A.S., Mitrofanov K.V. Measurements of Temporal Characteristics of Delayed Neutrons from Neutron Induced Fission of the Np-237 in Energy Range from 14.2 to 18 MeV. Proceedings of the seminar ISINN-24, 2016, Dubna, Russian Federation

#	Half-life [s]	Relative abundance a(i)
1	58.20 ± 0.50	0.045 ± 0.001
2	20.20 ± 0.20	0.181 ± 0.003
3	4.58 ± 0.11	0.211 ± 0.006
4	2.12 ± 0.04	0.451 ± 0.010
5	0.460 ± 0.500	0.100 ± 0.003
6	0.196 ± 0.500	0.013 ± 0.004

Average Half-life : 8.24 ± 0.23 s

Correlation matrix

	a1	T1	a2	T2	a3	T3	a4	T4	a5	T5	a6	T6
a1	1
T1	0	1
a2	0	0.67	1
T2	0	0.16	-0.03	1
a3	0	0.23	0.14	0.34	1
T3	0	0.08	-0.27	0.45	-0.05	1
a4	0	0.47	0.45	0.46	-0.1	0.33	1
T4	0	0.15	0.15	0.24	-0.23	-0.17	0.02	1
a5	0	0.04	0.03	0.04	0	0.02	-0.03	0.07	1
T5	0	0.03	0.03	0.03	0	0.03	-0.04	0.04	0	1
a6	0	0	0	0	0	0	0	0	0	0	1
T6	0	0	0	0	0	0	0	0	0	0	0	1

Energy: 15.83 MeV

#	Half-life [s]	Relative abundance a(i)
1	55.50 ± 0.30	0.050 ± 0.001
2	20.70 ± 0.10	0.170 ± 0.002
3	5.08 ± 0.10	0.219 ± 0.006
4	2.13 ± 0.03	0.439 ± 0.007
5	0.610 ± 0.020	0.107 ± 0.003
6	0.193 ± 0.006	0.014 ± 0.004

Average Half-life : 8.76 ± 0.17 s

Correlation matrix

	a1	T1	a2	T2	a3	T3	a4	T4	a5	T5	a6	T6
a1	1
T1	0	1
a2	0	0.8	1
T2	0	0.52	0.19	1
a3	0	0.31	0.22	0.36	1
T3	0	0.21	-0.21	0.64	-0.17	1
a4	0	0.7	0.53	0.67	-0.09	0.59	1
T4	0	0.14	0.19	0.08	-0.48	-0.04	0.14	1
a5	0	0.06	0.05	0.05	-0.01	0.02	-0.05	0.15	1
T5	0	0.03	0.02	0.03	0	0.03	-0.05	0.05	0	1
a6	0	0	0	0	0	0	0	0.01	0	0	1
T6	0	0	0	0	0	0	0	0.01	0	0	0	1

Energy: 16.76 MeV

#	Half-life [s]	Relative abundance a(i)
1	58.20 ± 0.50	0.047 ± 0.001
2	21.50 ± 0.20	0.186 ± 0.003
3	4.93 ± 0.12	0.220 ± 0.006
4	2.10 ± 0.04	0.428 ± 0.009
5	0.460 ± 0.010	0.105 ± 0.003
6	0.196 ± 0.006	0.013 ± 0.004

Average Half-life : 8.78 ± 0.24 s

Correlation matrix

	a1	T1	a2	T2	a3	T3	a4	T4	a5	T5	a6	T6
a1	1
T1	0	1
a2	0	0.69	1
T2	0	0.16	-0.02	1
a3	0	0.25	0.18	0.37	1
T3	0	0.07	-0.27	0.5	-0.07	1
a4	0	0.47	0.46	0.45	-0.08	0.37	1
T4	0	0.15	0.17	0.2	-0.26	-0.12	0.03	1
a5	0	0.04	0.04	0.04	0	0.02	-0.04	0.07	1
T5	0	0.03	0.03	0.03	0	0.03	-0.04	0.05	0	1
a6	0	0	0	0	0	0	0	0	0	0	1
T6	0	0	0	0	0	0	0	0.01	0	0	0	1

Energy: 17.98 MeV

#	Half-life [s]	Relative abundance a(i)
1	55.20 ± 0.40	0.041 ± 0.001
2	21.40 ± 0.20	0.205 ± 0.003
3	5.04 ± 0.12	0.202 ± 0.003
4	1.97 ± 0.04	0.447 ± 0.009
5	0.460 ± 0.010	0.094 ± 0.003
6	0.196 ± 0.006	0.012 ± 0.003

Average Half-life : 8.58 ± 0.20 s

Correlation matrix

	a1	T1	a2	T2	a3	T3	a4	T4	a5	T5	a6	T6
a1	1
T1	0	1
a2	0	0.76	1
T2	0	0.15	0.04	1
a3	0	0.25	0.22	0.37	1
T3	0	0.06	-0.23	0.56	-0.11	1
a4	0	0.54	0.54	0.49	-0.05	0.43	1
T4	0	0.15	0.2	0.16	-0.33	-0.06	0.07	1
a5	0	0.05	0.05	0.05	0.01	0.02	-0.04	0.1	1
T5	0	0.04	0.04	0.04	0	0.03	-0.05	0.06	0	1
a6	0	0	0	0	0	0	0	0.01	0	0	1
T6	0	0	0	0	0	0	0	0.01	0	0	0	1

238PU

Energy: Thermal Spectrum

#	Half-life [s]	Relative abundance a(i)
1	54.9 ± 0.570	0.043 ± 0.007
2	22.9 ± 0.260	0.307 ± 0.048
3	8.15 ± 1.100	0.114 ± 0.067
4	3.52 ± 0.410	0.176 ± 0.028
5	1.95 ± 0.280	0.327 ± 0.052
6	0.513 ± 0.150	0.033 ± 0.190

Average Half-life : 11.58 ± 1.31 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.042 ± 0.009
2	24.5	0.219 ± 0.027
3	16.3	0.137 ± 0.058
4	5.21	0.134 ± 0.065
5	2.37	0.386 ± 0.008
6	1.04	0.066 ± 0.100
7	0.424	0.017 ± 0.170

Average Half-life : 11.59 ± 1.31 s

Energy: Fast Spectrum

#	Half-life [s]	Relative abundance a(i)
1	49.5 ± 1.800	0.068 ± 0.007
2	21.9 ± 1.100	0.280 ± 0.018
3	4.95 ± 0.210	0.300 ± 0.020
4	1.87 ± 0.110	0.285 ± 0.030
5	0.578 ± 0.290	0.069 ± 0.023

Average Half-life : 11.52 ± .64 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.045 ± 0.008
2	24.5	0.250 ± 0.018
3	16.3	0.052 ± 0.001
4	5.21	0.256 ± 0.014
5	2.37	0.251 ± 0.035
6	1.04	0.120 ± 0.012
7	0.424	0.027 ± 0.016

Average Half-life : 11.52 ± .64 s

238U

#	Half-life [s]	Relative abundance a(i)
1	53.0 ± 1.700	0.008 ± 0.003
2	22.0 ± 0.600	0.101 ± 0.040
3	5.30 ± 0.330	0.158 ± 0.050
4	2.00 ± 0.110	0.408 ± 0.033
5	0.510 ± 0.060	0.238 ± 0.025
6	0.180 ± 0.020	0.087 ± 0.010

Average Half-life : 4.44 ± .94 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.005 ± 0.000
2	24.5	0.079 ± 0.032
3	16.3	0.027 ± 0.026
4	5.21	0.146 ± 0.049
5	2.37	0.305 ± 0.030
6	1.04	0.201 ± 0.023
7	0.424	0.141 ± 0.012
8	0.195	0.097 ± 0.014

Average Half-life : 4.43 ± .93 s

#	Half-life [s]	Relative abundance a(i)
1	55.6 ± 0.000	0.013 ± 0.001
2	22.0 ± 0.000	0.160 ± 0.005
3	4.51 ± 0.000	0.235 ± 0.018
4	1.52 ± 0.000	0.418 ± 0.033
5	0.430 ± 0.000	0.174 ± 0.034

Average Half-life : 6.00 ± .16 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.014 ± 0.001
2	24.5	0.087 ± 0.004
3	16.3	0.092 ± 0.004
4	5.21	0.093 ± 0.013
5	2.37	0.363 ± 0.026
6	1.04	0.195 ± 0.026
7	0.424	0.157 ± 0.032

Average Half-life : 6.00 ± .16 s

#	Half-life [s]	Relative abundance a(i)
1	52.4 ± 1.300	0.013 ± 0.001
2	21.6 ± 0.390	0.137 ± 0.002
3	5.00 ± 0.190	0.162 ± 0.020
4	1.93 ± 0.070	0.388 ± 0.012
5	0.490 ± 0.023	0.225 ± 0.013
6	0.172 ± 0.009	0.075 ± 0.005

Average Half-life : 5.32 ± .14 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.008 ± 0.001
2	24.5	0.104 ± 0.002
3	16.3	0.038 ± 0.001
4	5.21	0.137 ± 0.020
5	2.37	0.294 ± 0.012
6	1.04	0.198 ± 0.002
7	0.424	0.128 ± 0.013
8	0.195	0.093 ± 0.003

Average Half-life : 5.32 ± .14 s

#	Half-life [s]	Relative abundance a(i)
1	52.5 ± 0.000	0.013 ± 0.001
2	21.9 ± 0.140	0.144 ± 0.003
3	4.68 ± 0.250	0.182 ± 0.031
4	2.71 ± 0.130	0.372 ± 0.024
5	0.379 ± 0.025	0.257 ± 0.026
6	0.0619 ± 0.036	0.032 ± 0.030

Average Half-life : 5.80 ± .20 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0 ± 0.0001*
2	24.5	0.0971 ± 0.005*
3	16.3	0.0061 ± 0.0003*
4	5.21	0.5056 ± 0.027*
5	2.37	0 ± 0.0001*
6	1.04	0.2463 ± 0.013*
7	0.424	0 ± 0.0001*
8	0.195	0.1449 ± 0.008*

Average Half-life : 5.40 ± .19 s

#	Half-life [s]	Relative abundance a(i)
1	55.3 ± 0.130	0.011 ± 0.001
2	22.9 ± 0.075	0.120 ± 0.009
3	7.98 ± 0.280	0.077 ± 0.008
4	2.83 ± 0.040	0.356 ± 0.030
5	0.983 ± 0.071	0.261 ± 0.027
6	0.277 ± 0.120	0.176 ± 0.110

Average Half-life : 5.25 ± .24 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.012 ± 0.001
2	24.5	0.073 ± 0.008
3	16.3	0.073 ± 0.005
4	5.21	0.104 ± 0.014
5	2.37	0.360 ± 0.031
6	1.04	0.132 ± 0.021
7	0.424	0.187 ± 0.083
8	0.195	0.059 ± 0.073

Average Half-life : 5.25 ± .24 s

Energy: 1.5 MeV

5-Groups
Original Model - B. P. MAKSYUTENKO, Relative Yields of Delayed Neutrons in the Fission of 235U and 238U, Iadernaia Fizika (English Translation), 19, No. 1, 910 (July 1, 1965).

#	Half-life [s]	Relative abundance a(i)
1	55.0 ± 0.000	0.023 ± 0.002
2	24.0 ± 0.000	0.204 ± 0.003
3	15.2 ± 0.000	0.061 ± 0.000
4	5.20 ± 0.000	0.189 ± 0.004
5	2.20 ± 0.000	0.524 ± 0.022

Average Half-life : 9.19 ± .15 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.025 ± 0.002
2	24.5	0.155 ± 0.002
3	16.3	0.125 ± 0.003
4	5.21	0.122 ± 0.002
5	2.37	0.558 ± 0.021
6	1.04	0.016 ± 0.008

Average Half-life : 9.20 ± .15 s

Energy: 1.75 MeV

5-Groups
Original Model - B. P. MAKSYUTENKO, Relative Yields of Delayed Neutrons in the Fission of 235U and 238U, Iadernaia Fizika (English Translation), 19, No. 1, 910 (July 1, 1965).

#	Half-life [s]	Relative abundance a(i)
1	55.0 ± 0.000	0.023 ± 0.002
2	24.0 ± 0.000	0.205 ± 0.003
3	15.2 ± 0.000	0.061 ± 0.0003
4	5.20 ± 0.000	0.184 ± 0.004
5	2.20 ± 0.000	0.527 ± 0.023

Average Half-life : 9.23 ± .15 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.025 ± 0.002
2	24.5	0.158 ± 0.002
3	16.3	0.124 ± 0.003
4	5.21	0.115 ± 0.002
5	2.37	0.562 ± 0.022
6	1.04	0.016 ± 0.008

Average Half-life : 9.24 ± .15 s

Energy: 2.3 MeV

6-Groups
Original Model - B. P. MAKSYUTENKO, Relative Yields of Delayed Neutrons in the Fission of 235U and 238U, Iadernaia Fizika (English Translation), 19, No. 1, 910 (July 1, 1965).

#	Half-life [s]	Relative abundance a(i)
1	55.0 ± 0.000	0.013 ± 0.001
2	24.0 ± 0.000	0.108 ± 0.006
3	15.2 ± 0.000	0.065 ± 0.003
4	5.20 ± 0.000	0.118 ± 0.007
5	2.20 ± 0.000	0.481 ± 0.025
6	0.500 ± 0.000	0.214 ± 0.034

Average Half-life : 6.06 ± .17 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.009 ± 0.001
2	24.5	0.123 ± 0.006
3	16.3	0.038 ± 0.002
4	5.21	0.155 ± 0.009
5	2.37	0.374 ± 0.021
6	1.04	0.159 ± 0.022
7	0.424	0.143 ± 0.030

Average Half-life : 6.05 ± .17 s

Energy: 2.4 MeV

#	Half-life [s]	Relative abundance a(i)
1	54.9 ± 0.000	0.012 ± 0.001
2	21.4 ± 0.000	0.152 ± 0.015
3	5.47 ± 0.000	0.176 ± 0.018
4	1.95 ± 0.000	0.440 ± 0.044
5	0.568 ± 0.000	0.220 ± 0.022

Average Half-life : 5.86 ± .35 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.008 ± 0.001
2	24.5	0.116 ± 0.011
3	16.3	0.040 ± 0.012
4	5.21	0.185 ± 0.013
5	2.37	0.276 ± 0.040
6	1.04	0.279 ± 0.028
7	0.424	0.098 ± 0.014

Average Half-life : 5.85 ± .36 s

Energy: 3.3 MeV

#	Half-life [s]	Relative abundance a(i)
1	53.5 ± 0.000	0.014 ± 0.001
2	20.3 ± 0.000	0.153 ± 0.015
3	5.66 ± 0.000	0.169 ± 0.017
4	2.10 ± 0.000	0.423 ± 0.042
5	0.590 ± 0.000	0.241 ± 0.024

Average Half-life : 5.84 ± .34 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.007 ± 0.001
2	24.5	0.114 ± 0.009
3	16.3	0.037 ± 0.013
4	5.21	0.223 ± 0.014
5	2.37	0.238 ± 0.038
6	1.04	0.284 ± 0.026
7	0.424	0.098 ± 0.016

Average Half-life : 5.83 ± .34 s

Energy: 3.8 MeV

6-Groups
Original Model - B. P. MAKSYUTENKO, Relative Yields of Delayed Neutrons in the Fission of 235U and 238U, Iadernaia Fizika (English Translation), 19, No. 1, 910 (July 1, 1965).

#	Half-life [s]	Relative abundance a(i)
1	55.0 ± 0.000	0.014 ± 0.001
2	24.0 ± 0.000	0.107 ± 0.006
3	15.2 ± 0.000	0.058 ± 0.003
4	5.20 ± 0.000	0.143 ± 0.009
5	2.20 ± 0.000	0.455 ± 0.025
6	0.500 ± 0.000	0.223 ± 0.036

Average Half-life : 6.06 ± .18 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.010 ± 0.001
2	24.5	0.126 ± 0.006
3	16.3	0.025 ± 0.001
4	5.21	0.185 ± 0.011
5	2.37	0.342 ± 0.020
6	1.04	0.163 ± 0.023
7	0.424	0.149 ± 0.031

Average Half-life : 6.06 ± .18 s

Energy: 3.9 MeV

4-Groups
Original Model - B. P. MAKSYUTENKO, Y. F. BALASKSHEV, and G. I. VOLKOVA, Relative Yields of Delayed Neutrons from 238U Fission by 3.9-5.1 MeV Neutrons, (translated from Russian) Report INDC (CCP)-42/U, 7 (1974).

#	Half-life [s]	Relative abundance a(i)
1	52.4 ± 0.000	0.015 ± 0.002
2	21.6 ± 0.000	0.137 ± 0.002
3	5.00 ± 0.000	0.213 ± 0.011
4	1.93 ± 0.000	0.636 ± 0.006

Average Half-life : 6.02 ± .11 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.021 ± 0.001
2	24.5	0.007 ± 0.000
3	16.3	0.180 ± 0.004
4	5.21	0.001 ± 0.009
5	2.37	0.726 ± 0.008
6	1.04	0.066 ± 0.001

Average Half-life : 6.04 ± .11 s

Energy: 4.2 MeV

#	Half-life [s]	Relative abundance a(i)
1	52.4 ± 0.000	0.017 ± 0.002
2	21.6 ± 0.000	0.144 ± 0.001
3	5 ± 0.000	0.202 ± 0.004
4	1.93 ± 0.000	0.638 ± 0.079

Average Half-life : 6.22 ± .18 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.020 ± 0.001
2	24.5	0.026 ± 0.001
3	16.3	0.166 ± 0.003
4	5.21	0.002 ± 0.000
5	2.37	0.719 ± 0.062
6	1.04	0.068 ± 0.052

Average Half-life : 6.23 ± .17 s

Energy: 4.5 MeV

#	Half-life [s]	Relative abundance a(i)
1	52.4 ± 0.000	0.018 ± 0.002
2	21.6 ± 0.000	0.171 ± 0.006
3	5.00 ± 0.000	0.230 ± 0.009
4	1.93 ± 0.000	0.581 ± 0.085

Average Half-life : 6.92 ± .23 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.023 ± 0.002
2	24.5	0.038 ± 0.001
3	16.3	0.181 ± 0.005
4	5.21	0.034 ± 0.001
5	2.37	0.665 ± 0.071
6	1.04	0.060 ± 0.049

Average Half-life : 6.95 ± .24 s

Energy: 4.8 MeV

#	Half-life [s]	Relative abundance a(i)
1	52.4 ± 0.000	0.014 ± 0.001
2	21.6 ± 0.000	0.149 ± 0.001
3	5.00 ± 0.000	0.206 ± 0.001
4	1.93 ± 0.000	0.632 ± 0.001

Average Half-life : 6.20 ± .08 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.019 ± 0.0004
2	24.5	0.023 ± 0.0005
3	16.3	0.174 ± 0.004
4	5.21	0.002 ± 0.0001
5	2.37	0.716 ± 0.0001
6	1.04	0.066 ± 0.020

Average Half-life : 6.23 ± .07 s

Energy: 5 MeV

#	Half-life [s]	Relative abundance a(i)
1	55.0 ± 0.000	0.020 ± 0.002
2	24.0 ± 0.000	0.151 ± 0.003
3	15.5 ± 0.000	0.071 ± 0.003
4	5.20 ± 0.000	0.214 ± 0.006
5	2.20 ± 0.000	0.545 ± 0.014

Average Half-life : 8.13 ± .15 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.023 ± 0.002
2	24.5	0.105 ± 0.003
3	16.3	0.132 ± 0.004
4	5.21	0.144 ± 0.005
5	2.37	0.580 ± 0.014
6	1.04	0.016 ± 0.003

Average Half-life : 8.14 ± .15 s

Energy: 5.1 MeV

#	Half-life [s]	Relative abundance a(i)
1	52.4 ± 0.000	0.017 ± 0.002
2	21.6 ± 0.000	0.138 ± 0.004
3	5.00 ± 0.000	0.197 ± 0.016
4	1.93 ± 0.000	0.647 ± 0.083

Average Half-life : 6.13 ± .21 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.020 ± 0.002
2	24.5	0.030 ± 0.001
3	16.3	0.154 ± 0.004
4	5.21	0.002 ± 0.000
5	2.37	0.724 ± 0.073
6	1.04	0.070 ± 0.045

Average Half-life : 6.15 ± .22 s

Energy: 5.75 MeV

5-Groups
Original Model - B. P. MAKSYUTENKO, Relative Yields of Delayed Neutrons in the Fission of 235U and 238U, Iadernaia Fizika (English Translation), 19, No. 1, 910 (July 1, 1965).

#	Half-life [s]	Relative abundance a(i)
1	55.0 ± 0.000	0.019 ± 0.002
2	24.0 ± 0.000	0.134 ± 0.006
3	15.2 ± 0.000	0.074 ± 0.003
4	5.20 ± 0.000	0.178 ± 0.013
5	2.20 ± 0.000	0.595 ± 0.015

Average Half-life : 7.65 ± .20 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.023 ± 0.002
2	24.5	0.084 ± 0.006
3	16.3	0.140 ± 0.004
4	5.21	0.103 ± 0.012
5	2.37	0.632 ± 0.015
6	1.04	0.018 ± 0.003

Average Half-life : 7.66 ± .20 s

Energy: 6 MeV

#	Half-life [s]	Relative abundance a(i)
1	55.0 ± 0.000	0.019 ± 0.002
2	24.0 ± 0.000	0.134 ± 0.006
3	15.5 ± 0.000	0.074 ± 0.003
4	5.20 ± 0.000	0.178 ± 0.013
5	2.20 ± 0.000	0.595 ± 0.015

Average Half-life : 7.67 ± .20 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.023 ± 0.002
2	24.5	0.086 ± 0.006
3	16.3	0.138 ± 0.004
4	5.21	0.102 ± 0.012
5	2.37	0.633 ± 0.015
6	1.04	0.018 ± 0.003

Average Half-life : 7.68 ± .20 s

Energy: 6.4 MeV

#	Half-life [s]	Relative abundance a(i)
1	55.0 ± 0.000	0.024 ± 0.002
2	24.0 ± 0.000	0.194 ± 0.004
3	15.5 ± 0.000	0.064 ± 0.004
4	5.20 ± 0.000	0.249 ± 0.007
5	2.20 ± 0.000	0.469 ± 0.015

Average Half-life : 9.31 ± .19 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.027 ± 0.002
2	24.5	0.151 ± 0.004
3	16.3	0.121 ± 0.005
4	5.21	0.188 ± 0.006
5	2.37	0.500 ± 0.015
6	1.04	0.014 ± 0.003

Average Half-life : 9.32 ± .19 s

Energy: 6.6 MeV

5-Groups
Original Model - B. P. MAKSYUTENKO, Relative Yields of Delayed Neutrons in the Fission of 235U and 238U, Iadernaia Fizika (English Translation), 19, No. 1, 910 (July 1, 1965).

#	Half-life [s]	Relative abundance a(i)
1	55 ± 0.000	0.021 ± 0.002
2	24 ± 0.000	0.149 ± 0.007
3	15.5 ± 0.000	0.078 ± 0.007
4	5.2 ± 0.000	0.238 ± 0.011
5	2.2 ± 0.000	0.515 ± 0.027

Average Half-life : 8.26 ± .24 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.024 ± 0.002
2	24.5	0.101 ± 0.006
3	16.3	0.139 ± 0.008
4	5.21	0.173 ± 0.009
5	2.37	0.548 ± 0.027
6	1.04	0.015 ± 0.006

Average Half-life : 8.27 ± .23 s

Energy: 6.8 MeV

#	Half-life [s]	Relative abundance a(i)
1	55.0 ± 0.000	0.014 ± 0.001
2	24.0 ± 0.000	0.169 ± 0.005
3	15.5 ± 0.000	0.008 ± 0.003
4	5.20 ± 0.000	0.182 ± 0.008
5	2.20 ± 0.000	0.627 ± 0.047

Average Half-life : 7.26 ± .19 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.017 ± 0.001
2	24.5	0.124 ± 0.005
3	16.3	0.072 ± 0.003
4	5.21	0.101 ± 0.002
5	2.37	0.668 ± 0.046
6	1.04	0.018 ± 0.013

Average Half-life : 7.27 ± .19 s

Energy: 6.9 MeV

#	Half-life [s]	Relative abundance a(i)
1	55.0 ± 0.000	0.021 ± 0.002
2	24.0 ± 0.000	0.173 ± 0.005
3	15.5 ± 0.000	0.065 ± 0.004
4	5.20 ± 0.000	0.239 ± 0.008
5	2.20 ± 0.000	0.502 ± 0.017

Average Half-life : 8.65 ± .19 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.023 ± 0.002
2	24.5	0.129 ± 0.005
3	16.3	0.124 ± 0.005
4	5.21	0.175 ± 0.007
5	2.37	0.535 ± 0.017
6	1.04	0.015 ± 0.004

Average Half-life : 8.66 ± .19 s

Energy: 7.1 MeV

#	Half-life [s]	Relative abundance a(i)
1	55.0 ± 0.000	0.021 ± 0.002
2	24.0 ± 0.000	0.172 ± 0.004
3	15.5 ± 0.000	0.073 ± 0.004
4	5.20 ± 0.000	0.215 ± 0.007
5	2.20 ± 0.000	0.520 ± 0.014

Average Half-life : 8.65 ± .17 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.023 ± 0.002
2	24.5	0.125 ± 0.004
3	16.3	0.134 ± 0.004
4	5.21	0.148 ± 0.006
5	2.37	0.554 ± 0.014
6	1.04	0.015 ± 0.003

Average Half-life : 8.66 ± .17 s

Energy: 7.25 MeV

#	Half-life [s]	Relative abundance a(i)
1	55.0 ± 0.000	0.018 ± 0.002
2	24.0 ± 0.000	0.143 ± 0.003
3	15.5 ± 0.000	0.431 ± 0.025
4	5.20 ± 0.000	0.156 ± 0.005
5	2.20 ± 0.000	0.252 ± 0.009

Average Half-life : 12.47 ± .41 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.021 ± 0.001
2	24.5	0.077 ± 0.002
3	16.3	0.496 ± 0.024
4	5.21	0.133 ± 0.010
5	2.37	0.264 ± 0.005
6	1.04	0.008 ± 0.004

Average Half-life : 12.48 ± .40 s

Energy: 7.5 MeV

#	Half-life [s]	Relative abundance a(i)
1	55.0 ± 0.000	0.019 ± 0.002
2	24.0 ± 0.000	0.157 ± 0.003
3	15.5 ± 0.000	0.399 ± 0.023
4	5.20 ± 0.000	0.167 ± 0.004
5	2.20 ± 0.000	0.258 ± 0.008

Average Half-life : 12.45 ± .38 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.023 ± 0.001
2	24.5	0.093 ± 0.002
3	16.3	0.463 ± 0.022
4	5.21	0.143 ± 0.009
5	2.37	0.271 ± 0.005
6	1.04	0.008 ± 0.003

Average Half-life : 12.46 ± .37 s

Energy: 7.76 MeV

#	Half-life [s]	Relative abundance a(i)
1	55.0 ± 0.000	0.021 ± 0.002
2	24.0 ± 0.000	0.155 ± 0.009
3	15.5 ± 0.000	0.079 ± 0.009
4	5.20 ± 0.000	0.150 ± 0.015
5	2.20 ± 0.000	0.595 ± 0.042

Average Half-life : 8.21 ± .30 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.024 ± 0.002
2	24.5	0.105 ± 0.008
3	16.3	0.146 ± 0.011
4	5.21	0.074 ± 0.011
5	2.37	0.633 ± 0.042
6	1.04	0.018 ± 0.010

Average Half-life : 8.22 ± .31 s

Energy: 14 MeV

#	Half-life [s]	Relative abundance a(i)
1	55.200 ± 0.000	0.034 ± 0.003
2	22.600 ± 0.000	0.282 ± 0.028
3	5.800 ± 0.000	0.188 ± 0.019
4	1.700 ± 0.000	0.376 ± 0.038
5	0.400 ± 0.000	0.120 ± 0.012

Average Half-life : 10.02 ± .67 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.035 ± 0.003
2	24.5	0.179 ± 0.023
3	16.3	0.141 ± 0.018
4	5.21	0.098 ± 0.011
5	2.37	0.299 ± 0.032
6	1.04	0.143 ± 0.025
7	0.424	0.095 ± 0.002
8	0.195	0.010 ± 0.006

Average Half-life : 10.03 ± .66 s

#	Half-life [s]	Relative abundance a(i)
1	55.0 ± 0.000	0.035 ± 0.003
2	22.0 ± 0.000	0.257 ± 0.028
3	6.00 ± 0.000	0.292 ± 0.049
4	2.00 ± 0.000	0.417 ± 0.042

Average Half-life : 10.14 ± .70 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.041 ± 0.003
2	24.5	0.087 ± 0.020
3	16.3	0.235 ± 0.025
4	5.21	0.158 ± 0.048
5	2.37	0.441 ± 0.036
6	1.04	0.038 ± 0.018

Average Half-life : 10.17 ± .71 s

#	Half-life [s]	Relative abundance a(i)
1	55.0 ± 0.000	0.027 ± 0.005
2	22.0 ± 0.000	0.165 ± 0.027
3	6.00 ± 0.000	0.214 ± 0.054
4	2.00 ± 0.000	0.339 ± 0.034
5	0.500 ± 0.000	0.174 ± 0.017
6	0.200 ± 0.000	0.080 ± 0.008

Average Half-life : 7.18 ± .74 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.027 ± 0.005
2	24.5	0.093 ± 0.020
3	16.3	0.102 ± 0.023
4	5.21	0.183 ± 0.056
5	2.37	0.263 ± 0.014
6	1.04	0.127 ± 0.027
7	0.424	0.135 ± 0.003
8	0.195	0.071 ± 0.010

Average Half-life : 7.18 ± .74 s

#	Half-life [s]	Relative abundance a(i)
1	55.0 ± 0.000	0.022 ± 0.003
2	24.0 ± 0.000	0.168 ± 0.022
3	15.5 ± 0.000	0.202 ± 0.018
4	5.20 ± 0.000	0.415 ± 0.037
5	2.20 ± 0.000	0.192 ± 0.087

Average Half-life : 10.98 ± .68 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.024 ± 0.003
2	24.5	0.129 ± 0.020
3	16.3	0.243 ± 0.022
4	5.21	0.394 ± 0.030
5	2.37	0.204 ± 0.087
6	1.04	0.006 ± 0.021

Average Half-life : 10.99 ± .69 s

Energy: 14.7 MeV

5-Groups
Original Model - M. BUCKO, Investigation of Delayed Neutrons Arising from the Fission of 238U Nuclei by 14.7-MeV Neutrons, Soviet At. Energy, 20, 187 (1966); translated from Atom. Energy, 20, 153 (February 1, 1966).

#	Half-life [s]	Relative abundance a(i)
1	56.0 ± 0.000	0.024 ± 0.003
2	20.0 ± 0.000	0.164 ± 0.016
3	4.60 ± 0.000	0.178 ± 0.018
4	1.80 ± 0.000	0.396 ± 0.039
5	0.600 ± 0.000	0.238 ± 0.025

Average Half-life : 6.29 ± .37 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.018 ± 0.002
2	24.5	0.110 ± 0.010
3	16.3	0.046 ± 0.014
4	5.21	0.168 ± 0.010
5	2.37	0.234 ± 0.034
6	1.04	0.336 ± 0.031
7	0.424	0.088 ± 0.016

Average Half-life : 6.27 ± .37 s

#	Half-life [s]	Relative abundance a(i)
1	56.3 ± 0.700	0.017 ± 0.001
2	22 ± 0.200	0.130 ± 0.001
3	6 ± 0.200	0.127 ± 0.006
4	2.28 ± 0.040	0.406 ± 0.004
5	0.61 ± 0.020	0.196 ± 0.004
6	0.202 ± 0.005	0.124 ± 0.006

Average Half-life : 5.65 ± .08 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.016 ± 0.001
2	24.5	0.089 ± 0.002
3	16.3	0.051 ± 0.003
4	5.21	0.142 ± 0.004
5	2.37	0.325 ± 0.007
6	1.04	0.151 ± 0.003
7	0.424	0.121 ± 0.002
8	0.195	0.105 ± 0.004

Average Half-life : 5.64 ± .08 s

Energy: 14.8 MeV

#	Half-life [s]	Relative abundance a(i)
1	56.1 ± 0.000	0.042 ± 0.004
2	21.9 ± 0.000	0.275 ± 0.028
3	5.2 ± 0.000	0.341 ± 0.034
4	2.27 ± 0.000	0.341 ± 0.034

Average Half-life : 10.95 ± .68 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.041 ± 0.004
2	24.5	0.182 ± 0.022
3	16.3	0.108 ± 0.019
4	5.21	0.304 ± 0.032
5	2.37	0.360 ± 0.035
6	1.04	0.005 ± 0.002

Average Half-life : 10.95 ± .68 s

6-Groups
Original Model - G. BENEDICT, G. LUTHARDT, and G. HERMANN, Delayed-Neutron Yields from Fis- sion of 238U and 232Th by 14.8-MeV Neutrons, Radiochimica Acta, 17, No. 1, 61 (1972).

#	Half-life [s]	Relative abundance a(i)
1	56.0 ± 0.000	0.030 ± 0.003
2	18.8 ± 0.000	0.160 ± 0.016
3	5.10 ± 0.000	0.219 ± 0.022
4	2.14 ± 0.000	0.337 ± 0.034
5	0.600 ± 0.000	0.175 ± 0.018
6	0.150 ± 0.000	0.079 ± 0.008

Average Half-life : 6.63 ± .37 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.026 ± 0.003
2	24.5	0.071 ± 0.008
3	16.3	0.085 ± 0.015
4	5.21	0.241 ± 0.019
5	2.37	0.221 ± 0.033
6	1.04	0.233 ± 0.018
7	0.424	0.003 ± 0.012
8	0.195	0.121 ± 0.008

Average Half-life : 6.62 ± .37 s

Energy: 14.9 MeV

#	Half-life [s]	Relative abundance a(i)
1	53.6 ± 0.000	0.023 ± 0.005
2	21.0 ± 0.000	0.148 ± 0.003
3	5.10 ± 0.000	0.162 ± 0.030
4	2.21 ± 0.000	0.369 ± 0.022
5	0.610 ± 0.000	0.183 ± 0.012
6	0.210 ± 0.000	0.115 ± 0.018

Average Half-life : 6.12 ± .32 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.018 ± 0.005
2	24.5	0.098 ± 0.003
3	16.3	0.056 ± 0.001
4	5.21	0.150 ± 0.029
5	2.37	0.331 ± 0.024
6	1.04	0.129 ± 0.002
7	0.424	0.130 ± 0.014
8	0.195	0.087 ± 0.016

Average Half-life : 6.12 ± .32 s

Energy: 15 MeV

#	Half-life [s]	Relative abundance a(i)
1	56.1 ± 0.000	0.022 ± 0.002
2	21.9 ± 0.000	0.167 ± 0.017
3	5.20 ± 0.000	0.171 ± 0.017
4	2.27 ± 0.000	0.412 ± 0.041
5	0.600 ± 0.000	0.228 ± 0.023

Average Half-life : 6.85 ± .41 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.017 ± 0.002
2	24.5	0.152 ± 0.014
3	16.3	0.002 ± 0.011
4	5.21	0.237 ± 0.016
5	2.37	0.261 ± 0.039
6	1.04	0.240 ± 0.021
7	0.424	0.092 ± 0.016

Average Half-life : 6.84 ± .42 s

6-Groups
Original Model - B. P. MAKSYUTENKO, Relative Yields of Delayed Neutrons in the Fission of 235U and 238U, Iadernaia Fizika (English Translation), 19, No. 1, 910 (July 1, 1965).

#	Half-life [s]	Relative abundance a(i)
1	55.0 ± 0.000	0.019 ± 0.002
2	24.0 ± 0.000	0.092 ± 0.003
3	15.2 ± 0.000	0.063 ± 0.003
4	5.20 ± 0.000	0.130 ± 0.006
5	2.20 ± 0.000	0.413 ± 0.024
6	0.500 ± 0.000	0.283 ± 0.028

Average Half-life : 5.91 ± .14 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.013 ± 0.002
2	24.5	0.124 ± 0.003
3	16.3	0.010 ± 0.001
4	5.21	0.198 ± 0.007
5	2.37	0.267 ± 0.021
6	1.04	0.198 ± 0.018
7	0.424	0.189 ± 0.024

Average Half-life : 5.90 ± .14 s

Energy: 18.0 MeV

#	Half-life [s]	Relative abundance a(i)
1	55.0 ± 0.000	0.032 ± 0.003
2	24.0 ± 0.000	0.163 ± 0.0004
3	15.5 ± 0.000	0.083 ± 0.0004
4	5.20 ± 0.000	0.217 ± 0.007
5	2.20 ± 0.000	0.505 ± 0.015

Average Half-life : 9.22 ± .18 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.035 ± 0.003
2	24.5	0.118 ± 0.0004
3	16.3	0.142 ± 0.001
4	5.21	0.153 ± 0.006
5	2.37	0.537 ± 0.015
6	1.04	0.015 ± 0.004

Average Half-life : 9.23 ± .19 s

Energy: 18.2 MeV

5-Groups
Original Model - B. P. MAKSYUTENKO, Fractional Yields of Delayed Neutron Groups Following Fission of 238U by 18-21 MeV Neutrons, Soviet J. Nucl. Physics (English Translation), 7, No. 2, 189 (August, 1968).

#	Half-life [s]	Relative abundance a(i)
1	55.0 ± 0.000	0.031 ± 0.003
2	24.0 ± 0.000	0.149 ± 0.005
3	15.5 ± 0.000	0.087 ± 0.006
4	5.20 ± 0.000	0.217 ± 0.021
5	2.20 ± 0.000	0.517 ± 0.021

Average Half-life : 8.89 ± .26 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.034 ± 0.003
2	24.5	0.104 ± 0.005
3	16.3	0.146 ± 0.007
4	5.21	0.151 ± 0.020
5	2.37	0.550 ± 0.021
6	1.04	0.015 ± 0.005

Average Half-life : 8.90 ± .26 s

Energy: 18.5 MeV

#	Half-life [s]	Relative abundance a(i)
1	55.0 ± 0.000	0.029 ± 0.003
2	24.0 ± 0.000	0.166 ± 0.006
3	15.5 ± 0.000	0.061 ± 0.006
4	5.20 ± 0.000	0.234 ± 0.010
5	2.20 ± 0.000	0.509 ± 0.021

Average Half-life : 8.87 ± .25 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.031 ± 0.003
2	24.5	0.123 ± 0.006
3	16.3	0.120 ± 0.007
4	5.21	0.169 ± 0.009
5	2.37	0.542 ± 0.021
6	1.04	0.015 ± 0.005

Average Half-life : 8.88 ± .25 s

Energy: 18.8 MeV

#	Half-life [s]	Relative abundance a(i)
1	55.0 ± 0.000	0.030 ± 0.003
2	24.0 ± 0.000	0.150 ± 0.005
3	15.5 ± 0.000	0.076 ± 0.006
4	5.20 ± 0.000	0.218 ± 0.010
5	2.20 ± 0.000	0.527 ± 0.020

Average Half-life : 8.70 ± .23 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.032 ± 0.003
2	24.5	0.105 ± 0.005
3	16.3	0.136 ± 0.006
4	5.21	0.150 ± 0.008
5	2.37	0.561 ± 0.020
6	1.04	0.016 ± 0.005

Average Half-life : 8.71 ± .23 s

Energy: 19.0 MeV

5-Groups
Original Model - B. P. MAKSYUTENKO et al., Delayed Neutrons from Nuclear Fission by Neutrons with Energies of 15 to 21 MeV, Proc. of a Panel on Delayed Fission Neutrons, Int. Atomic Energy Agency, Vienna, 203 (April 24-27, 1967).

#	Half-life [s]	Relative abundance a(i)
1	55.0 ± 0.000	0.032 ± 0.003
2	24.0 ± 0.000	0.152 ± 0.004
3	15.5 ± 0.000	0.081 ± 0.005
4	5.20 ± 0.000	0.212 ± 0.008
5	2.20 ± 0.000	0.523 ± 0.032

Average Half-life : 8.93 ± .23 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.035 ± 0.003
2	24.5	0.107 ± 0.003
3	16.3	0.141 ± 0.006
4	5.21	0.145 ± 0.001
5	2.37	0.556 ± 0.032
6	1.04	0.016 ± 0.008

Average Half-life : 8.94 ± .23 s

Energy: 19.3 MeV

#	Half-life [s]	Relative abundance a(i)
1	55.0 ± 0.000	0.029 ± 0.003
2	24.0 ± 0.000	0.149 ± 0.006
3	15.5 ± 0.000	0.082 ± 0.006
4	5.20 ± 0.000	0.208 ± 0.011
5	2.20 ± 0.000	0.531 ± 0.023

Average Half-life : 8.71 ± .25 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.032 ± 0.003
2	24.5	0.103 ± 0.005
3	16.3	0.143 ± 0.007
4	5.21	0.141 ± 0.010
5	2.37	0.565 ± 0.023
6	1.04	0.016 ± 0.005

Average Half-life : 8.73 ± .25 s

Energy: 19.5 MeV

#	Half-life [s]	Relative abundance a(i)
1	55.0 ± 0.000	0.025 ± 0.003
2	24.0 ± 0.000	0.115 ± 0.007
3	15.5 ± 0.000	0.080 ± 0.008
4	5.20 ± 0.000	0.136 ± 0.013
5	2.20 ± 0.000	0.644 ± 0.033

Average Half-life : 7.50 ± .27 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.029 ± 0.003
2	24.5	0.065 ± 0.006
3	16.3	0.147 ± 0.009
4	5.21	0.055 ± 0.010
5	2.37	0.685 ± 0.033
6	1.04	0.019 ± 0.008

Average Half-life : 7.51 ± .26 s

Energy: 19.7 MeV

#	Half-life [s]	Relative abundance a(i)
1	55.0 ± 0.000	0.032 ± 0.003
2	24.0 ± 0.000	0.154 ± 0.004
3	15.5 ± 0.000	0.087 ± 0.005
4	5.20 ± 0.000	0.223 ± 0.008
5	2.20 ± 0.000	0.504 ± 0.017

Average Half-life : 9.06 ± .22 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.034 ± 0.003
2	24.5	0.109 ± 0.004
3	16.3	0.146 ± 0.006
4	5.21	0.159 ± 0.007
5	2.37	0.536 ± 0.017
6	1.04	0.015 ± 0.004

Average Half-life : 9.07 ± .23 s

Energy: 20.0 MeV

#	Half-life [s]	Relative abundance a(i)
1	55.0 ± 0.000	0.023 ± 0.002
2	24.0 ± 0.000	0.136 ± 0.005
3	15.5 ± 0.000	0.084 ± 0.006
4	5.20 ± 0.000	0.190 ± 0.009
5	2.20 ± 0.000	0.567 ± 0.022

Average Half-life : 8.07 ± .21 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.026 ± 0.002
2	24.5	0.088 ± 0.004
3	16.3	0.147 ± 0.006
4	5.21	0.118 ± 0.007
5	2.37	0.603 ± 0.022
6	1.04	0.017 ± 0.005

Average Half-life : 8.08 ± .21 s

Energy: 20.5 MeV

#	Half-life [s]	Relative abundance a(i)
1	55.0 ± 0.000	0.029 ± 0.003
2	24.0 ± 0.000	0.168 ± 0.004
3	15.5 ± 0.000	0.071 ± 0.004
4	5.20 ± 0.000	0.215 ± 0.007
5	2.20 ± 0.000	0.518 ± 0.018

Average Half-life : 8.95 ± .20 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.031 ± 0.003
2	24.5	0.123 ± 0.004
3	16.3	0.131 ± 0.005
4	5.21	0.149 ± 0.005
5	2.37	0.551 ± 0.018
6	1.04	0.015 ± 0.004

Average Half-life : 8.96 ± .21 s

Energy: 21.0 MeV

#	Half-life [s]	Relative abundance a(i)
1	55.0 ± 0.000	0.028 ± 0.003
2	24.0 ± 0.000	0.173 ± 0.005
3	15.5 ± 0.000	0.082 ± 0.006
4	5.20 ± 0.000	0.227 ± 0.010
5	2.20 ± 0.000	0.490 ± 0.020

Average Half-life : 9.24 ± .23 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.031 ± 0.003
2	24.5	0.128 ± 0.005
3	16.3	0.141 ± 0.006
4	5.21	0.164 ± 0.009
5	2.37	0.522 ± 0.020
6	1.04	0.015 ± 0.005

Average Half-life : 9.25 ± .23 s

Energy: 29 MeV

2-Groups
Original Model - K. H. SUN, R. A. CHARPIE, F. A. PECJAK, B. JENNINGS, J. F. NECHAJ, and A. J. ALLEN, Delayed Neutrons from 238U and 232Th Fission, Physical Review, 79, No. 1, 3 (July 1, 1950); originally reported in Westinghouse Research Laboratories report NP- 1464

#	Half-life [s]	Relative abundance a(i)
1	54.0 ± 0	0.143 ± 0.014
2	22.0 ± 0	0.857 ± 0.086

Average Half-life : 26.57 ± 2.04 s

3-Groups
Expanded Model using a fixed set of Half-lives
G. D. Spriggs, J. M. Campbell and V. M. Piksaikin, An 8-Group Neutron Model Based on a Consistent Set of Half-Lives, Los Alamos National Laboratory report LA-UR-98-1619, Rev. 3, (October 6, 1999).

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.107 ± 0.010
2	24.5	0.728 ± 0.075
3	16.3	0.165 ± 0.044

Average Half-life : 26.46 ± 2.04 s

Energy: 1.01 MeV

#	Half-life [s]	Relative abundance a(i)
1	52.4 ± 0.749	0.013 ± 0.0004
2	22.5 ± 0.213	0.150 ± 0.004
3	5.18 ± 0.117	0.168 ± 0.005
4	2.07 ± 0.050	0.363 ± 0.008
5	0.467 ± 0.016	0.229 ± 0.008
6	0.172 ± 0.006	0.077 ± 0.003

Average Half-life : 5.81 ± 0.11 s

Correlation matrix

	a1	T1	a2	T2	a3	T3	a4	T4	a5	T5	a6	T6
a1	1
T1	0	1
a2	0	0.48	1
T2	0	-0.36	-0.24	1
a3	0	0.07	0.19	0.26	1
T3	0	-0.07	-0.26	0.55	-0.15	1
a4	0	0.23	0.51	0.29	-0.03	0.37	1
T4	0	0.05	0.18	0.11	-0.31	-0.05	-0.04	1
a5	0	0.05	0.12	0.07	0.03	0.06	-0.05	0.17	1
T5	0	0.04	0.1	0.06	0.02	0.07	-0.09	0.12	-0.02	1
a6	0	0.01	0.02	0.01	0	0	0	0.02	-0.02	0	1
T6	0	0	0.02	0.01	0.01	0.01	0	0.03	-0.01	0	0	1

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.010 ± 0.0004
2	24.5	0.116 ± 0.005
3	16.3	0.044 ± 0.002
4	5.21	0.136 ± 0.006
5	2.37	0.327 ± 0.009
6	1.04	0.106 ± 0.005
7	0.424	0.175 ± 0.008
8	0.195	0.086 ± 0.004

Average Half-life : 5.80 ± 0.13 s

Energy: 3.23 MeV

#	Half-life [s]	Relative abundance a(i)
1	51.7 ± 0.348	0.013 ± 0.0002
2	21.7 ± 0.117	0.135 ± 0.002
3	5.02 ± 0.061	0.163 ± 0.003
4	1.97 ± 0.025	0.389 ± 0.005
5	0.490 ± 0.010	0.225 ± 0.004
6	0.172 ± 0.004	0.075 ± 0.002

Average Half-life : 5.32 ± 0.05 s

Correlation matrix

	a1	T1	a2	T2	a3	T3	a4	T4	a5	T5	a6	T6
a1	1
T1	0	1
a2	0	0.56	1
T2	0	-0.28	-0.21	1
a3	0	0.11	0.19	0.27	1
T3	0	-0.04	-0.24	0.56	-0.16	1
a4	0	0.31	0.52	0.32	-0.02	0.39	1
T4	0	0.08	0.19	0.1	-0.35	-0.06	-0.04	1
a5	0	0.09	0.15	0.09	0.03	0.06	-0.05	0.21	1
T5	0	0.06	0.1	0.07	0.01	0.07	-0.1	0.12	-0.02	1
a6	0	0.01	0.02	0.01	0	0	0	0.02	-0.01	0	1
T6	0	0.01	0.02	0.01	0	0.01	0	0.03	-0.02	0	0	1

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.009 ± 0.0004
2	24.5	0.095 ± 0.004
3	16.3	0.051 ± 0.002
4	5.21	0.118 ± 0.005
5	2.37	0.336 ± 0.010
6	1.04	0.153 ± 0.007
7	0.424	0.153 ± 0.007
8	0.195	0.085 ± 0.004

Average Half-life : 5.31 ± 0.11 s

Energy: 3.75 MeV

#	Half-life [s]	Relative abundance a(i)
1	52.9 ± 0.169	0.013 ± 0.0001
2	21.8 ± 0.055	0.133 ± 0.001
3	5.12 ± 0.032	0.164 ± 0.002
4	1.97 ± 0.013	0.389 ± 0.003
5	0.496 ± 0.007	0.228 ± 0.003
6	0.173 ± 0.003	0.074 ± 0.001

Average Half-life : 5.31 ± 0.03 s

Correlation matrix

	a1	T1	a2	T2	a3	T3	a4	T4	a5	T5	a6	T6
a1	1
T1	0	1
a2	0	0.77	1
T2	0	0.02	0.09	1
a3	0	0.26	0.36	0.19	1
T3	0	0.06	-0.06	0.65	-0.4	1
a4	0	0.53	0.63	0.5	0	0.57	1
T4	0	0.09	0.13	0.02	-0.58	0.17	0	1
a5	0	0.24	0.3	0.15	0.02	0.09	0.02	0.42	1
T5	0	0.09	0.12	0.08	-0.01	0.06	-0.17	0.28	0.03	1
a6	0	0.03	0.04	0.02	0	0.01	0.02	0.04	-0.04	0.03	1
T6	0	0.04	0.05	0.03	0	0.01	0.02	0.06	-0.05	0.02	-0.01	1

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.010 ± 0.0004
2	24.5	0.091 ± 0.004
3	16.3	0.053 ± 0.002
4	5.21	0.122 ± 0.005
5	2.37	0.331 ± 0.009
6	1.04	0.158 ± 0.007
7	0.424	0.154 ± 0.007
8	0.195	0.081 ± 0.004

Average Half-life : 5.31 ± 0.11 s

Energy: 4.20 MeV

#	Half-life [s]	Relative abundance a(i)
1	53.2 ± 0.261	0.013 ± 0.0002
2	22.0 ± 0.087	0.130 ± 0.002
3	5.25 ± 0.052	0.164 ± 0.003
4	1.93 ± 0.022	0.385 ± 0.004
5	0.495 ± 0.011	0.234 ± 0.005
6	0.175 ± 0.004	0.074 ± 0.002

Average Half-life : 5.27 ± 0.05 s

Correlation matrix

	a1	T1	a2	T2	a3	T3	a4	T4	a5	T5	a6	T6
a1	1
T1	0	1
a2	0	0.83	1
T2	0	0.14	0.16	1
a3	0	0.3	0.38	0.2	1
T3	0	0.1	-0.03	0.66	-0.43	1
a4	0	0.59	0.62	0.56	0.01	0.59	1
T4	0	0.1	0.12	0.04	-0.6	0.24	0	1
a5	0	0.29	0.34	0.18	0.02	0.11	0.04	0.44	1
T5	0	0.1	0.11	0.08	-0.01	0.07	-0.19	0.3	0.05	1
a6	0	0.03	0.04	0.02	0.01	0.01	0.02	0.04	-0.05	0.03	1
T6	0	0.04	0.05	0.03	0	0.01	0.02	0.06	-0.06	0.02	-0.01	1

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.010 ± 0.001
2	24.5	0.091 ± 0.004
3	16.3	0.051 ± 0.002
4	5.21	0.127 ± 0.005
5	2.37	0.303 ± 0.009
6	1.04	0.184 ± 0.008
7	0.424	0.148 ± 0.007
8	0.195	0.086 ± 0.004

Average Half-life : 5.27 ± 0.12 s

Energy: 4.72 MeV

#	Half-life [s]	Relative abundance a(i)
1	53.3 ± 0.598	0.013 ± 0.0004
2	21.9 ± 0.222	0.131 ± 0.004
3	5.17 ± 0.123	0.166 ± 0.007
4	1.94 ± 0.050	0.393 ± 0.010
5	0.486 ± 0.023	0.224 ± 0.010
6	0.173 ± 0.009	0.074 ± 0.004

Average Half-life : 5.29 ± 0.03 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.011 ± 0.001
2	24.5	0.088 ± 0.004
3	16.3	0.051 ± 0.002
4	5.21	0.123 ± 0.005
5	2.37	0.316 ± 0.009
6	1.04	0.161 ± 0.007
7	0.424	0.162 ± 0.008
8	0.195	0.088 ± 0.004

Average Half-life : 5.24 ± 0.11 s

Energy: 14.23 MeV

6-Groups
Original Model - Relative abundance of delayed neutrons and half-lives of their precursors for neutron induced fission of the 238U in energy range 14.2 - 17.9 MeV. V.M. Piksaikin, V.A. Roschenko, G.G. Korolev. Atomic energy. - 2007. - V. 102, N 2. - pp 124-132.

#	Half-life [s]	Relative abundance a(i)
1	53.4 ± 0.400	0.022 ± 0.001
2	20.9 ± 0.200	0.144 ± 0.003
3	4.64 ± 0.080	0.188 ± 0.005
4	1.92 ± 0.040	0.412 ± 0.008
5	0.500 ± 0.010	0.180 ± 0.005
6	0.176 ± 0.005	0.054 ± 0.002

Average Half-life : 5.90 ± 0.20 s

Correlation matrix

	a1	T1	a2	T2	a3	T3	a4	T4	a5	T5	a6	T6
a1	1
T1	0	1
a2	0	0.66	1
T2	0	0.01	-0.09	1
a3	0	0.21	0.2	0.31	1
T3	0	0.04	-0.25	0.55	-0.15	1
a4	0	0.46	0.51	0.42	-0.04	0.4	1
T4	0	0.11	0.18	0.11	-0.35	-0.12	-0.01	1
a5	0	0.1	0.11	0.09	0.02	0.05	-0.05	0.18	1
T5	0	0.07	0.07	0.06	0.01	0.06	-0.08	0.09	-0.01	1
a6	0	0.01	0.01	0.01	0	0	0	0.02	-0.01	0	1
T6	0	0.01	0.02	0.01	0	0.01	0	0.03	-0.01	0	0	1

Energy: 15.83 MeV

#	Half-life [s]	Relative abundance a(i)
1	53.7 ± 0.3	0.0215 ± 0.0004
2	21.0 ± 0.2	0.147 ± 0.003
3	4.64 ± 0.07	0.189 ± 0.005
4	1.99 ± 0.03	0.396 ± 0.007
5	0.500 ± 0.01	0.192 ± 0.005
6	0.178 ± 0.005	0.054 ± 0.002

Average Half-life : 6.00 ± 0.20 s

Correlation matrix

	a1	T1	a2	T2	a3	T3	a4	T4	a5	T5	a6	T6
a1	1
T1	0	1
a2	0	0.75	1
T2	0	0.16	0.04	1
a3	0	0.26	0.26	0.31	1
T3	0	0.08	-0.19	0.6	-0.2	1
a4	0	0.55	0.56	0.49	-0.06	0.48	1
T4	0	0.1	0.18	0.03	-0.44	-0.11	-0.01	1
a5	0	0.14	0.15	0.12	0.02	0.05	-0.05	0.26	1
T5	0	0.08	0.08	0.08	0	0.07	-0.1	0.14	0	1
a6	0	0.02	0.02	0.01	0	0	0	0.03	-0.02	0.01	1
T6	0	0.02	0.02	0.02	0	0	0	0.04	-0.02	0	0	1

Energy: 16.76 MeV

#	Half-life [s]	Relative abundance a(i)
1	54.2 ± 0.400	0.022 ± 0.001
2	21.1 ± 0.200	0.150 ± 0.003
3	4.78 ± 0.090	0.191 ± 0.005
4	1.99 ± 0.040	0.398 ± 0.008
5	0.500 ± 0.010	0.184 ± 0.005
6	0.178 ± 0.005	0.055 ± 0.002

Average Half-life : 6.20 ± 0.20 s

Correlation matrix

	a1	T1	a2	T2	a3	T3	a4	T4	a5	T5	a6	T6
a1	1
T1	0	1
a2	0	0.64	1
T2	0	0.03	-0.12	1
a3	0	0.23	0.2	0.34	1
T3	0	0.05	-0.27	0.56	-0.15	1
a4	0	0.45	0.48	0.42	-0.03	0.42	1
T4	0	0.12	0.18	0.12	-0.35	-0.05	0	1
a5	0	0.1	0.11	0.09	0.02	0.06	-0.06	0.18	1
T5	0	0.07	0.07	0.07	0.01	0.07	-0.08	0.09	-0.01	1
a6	0	0.01	0.01	0.01	0	0	0	0.02	-0.01	0	1
T6	0	0.01	0.01	0.01	0	0.01	-0.01	0.03	-0.01	0	0	1

Energy: 17.98 MeV

#	Half-life [s]	Relative abundance a(i)
1	52.9 ± 0.3	0.0225 ± 0.0005
2	21.4 ± 0.2	0.149 ± 0.003
3	4.94 ± 0.07	0.198 ± 0.005
4	2.00 ± 0.04	0.379 ± 0.007
5	0.490 ± 0.01	0.195 ± 0.005
6	0.178 ± 0.005	0.056 ± 0.002

Average Half-life : 6.20 ± 0.20 s

Correlation matrix

	a1	T1	a2	T2	a3	T3	a4	T4	a5	T5	a6	T6
a1	1
T1	0	1
a2	0	0.75	1
T2	0	0.15	0.03	1
a3	0	0.28	0.29	0.3	1
T3	0	0.08	-0.19	0.62	-0.25	1
a4	0	0.55	0.55	0.51	-0.04	0.52	1
T4	0	0.1	0.16	0.02	-0.48	-0.01	0.01	1
a5	0	0.16	0.17	0.13	0.02	0.06	-0.04	0.29	1
T5	0	0.08	0.08	0.08	0.01	0.07	-0.11	0.15	0.01	1
a6	0	0.02	0.02	0.01	0	0	0	0.03	-0.02	0.01	1
T6	0	0.02	0.02	0.02	0	0.01	0	0.04	-0.02	0	0	1

239PU

Energy: Thermal Spectrum

#	Half-life [s]	Relative abundance a(i)
1	55.0 ± 0.400	0.030 ± 0.000
2	22.5 ± 0.500	0.295 ± 0.003
3	4.50 ± 0.200	0.322 ± 0.012
4	1.10 ± 0.060	0.354 ± 0.029

Average Half-life : 10.10 ± .19 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.026 ± 0.003
2	24.5	0.235 ± 0.004
3	16.3	0.063 ± 0.001
4	5.21	0.241 ± 0.011
5	2.37	0.131 ± 0.012
6	1.04	0.304 ± 0.026

Average Half-life : 10.10 ± .19 s

4-Groups
Original Model - B. T. FELD and F. de HOFFMANN, Delayed Neutrons from 49 (239Pu), Los Alamos Scientific Laboratory report LA-231 (U), Los Alamos, NM (February 27, 1945).

#	Half-life [s]	Relative abundance a(i)
1	55.2 ± 0.000	0.040 ± 0.004
2	22.5 ± 0.000	0.288 ± 0.029
3	5.20 ± 0.000	0.371 ± 0.037
4	1.11 ± 0.000	0.301 ± 0.030

Average Half-life : 10.95 ± .72 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.040 ± 0.003
2	24.5	0.192 ± 0.025
3	16.3	0.120 ± 0.017
4	5.21	0.308 ± 0.035
5	2.37	0.083 ± 0.015
6	1.04	0.257 ± 0.028

Average Half-life : 10.96 ± .72 s

#	Half-life [s]	Relative abundance a(i)
1	54.3 ± 2.300	0.035 ± 0.009
2	23.0 ± 1.700	0.298 ± 0.035
3	5.60 ± 0.400	0.211 ± 0.048
4	2.13 ± 0.240	0.326 ± 0.033
5	0.618 ± 0.210	0.086 ± 0.029
6	0.257 ± 0.045	0.044 ± 0.016

Average Half-life : 10.69 ± 1.11 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.032 ± 0.012
2	24.5	0.237 ± 0.034
3	16.3	0.083 ± 0.002
4	5.21	0.182 ± 0.052
5	2.37	0.294 ± 0.029
6	1.04	0.082 ± 0.002
7	0.424	0.072 ± 0.031
8	0.195	0.019 ± 0.0004

Average Half-life : 10.70 ± 1.10 s

5-Groups
Original Model - M. HUIZINGA, Short-Lived Delayed Neutron and Photoneutron Groups from Fission Fragments of 239Pu in Light and Heavy Water, Dissertation, Virginia Polytechnic Institute, Blacksburg, VPI (November 1968).

#	Half-life [s]	Relative abundance a(i)
1	54.5 ± 43.000	0.074 ± 0.160
2	21.1 ± 2.700	0.257 ± 0.037
3	5.67 ± 0.610	0.218 ± 0.043
4	2.12 ± 0.210	0.343 ± 0.042
5	0.43 ± 0.038	0.108 ± 0.008

Average Half-life : 11.47 ± 9.35 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.069 ± 0.160
2	24.5	0.139 ± 0.003
3	16.3	0.151 ± 0.003
4	5.21	0.168 ± 0.003
5	2.37	0.334 ± 0.060
6	1.04	0.037 ± 0.001
7	0.424	0.102 ± 0.002

Average Half-life : 11.47 ± 8.90 s

5-Groups
Original Model - R. J. ONEGA, G. E. RAMBO, M. HUIZINGA, and A. ROBESON, Delayed-Neutron Half-Lives for 233U, 235U, and 239Pu, Trans. Am. Nucl. Soc., 12, 1, 289 (June 5-19, 1969).

#	Half-life [s]	Relative abundance a(i)
1	54.5 ± 43.000	0.074 ± 0.160
2	21.1 ± 2.700	0.257 ± 0.037
3	5.67 ± 0.610	0.218 ± 0.043
4	2.12 ± 0.210	0.343 ± 0.042
5	0.4 ± 0.040	0.108 ± 0.008

Average Half-life : 11.46 ± 9.35 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.069 ± 0.160
2	24.5	0.141 ± 0.003
3	16.3	0.148 ± 0.003
4	5.21	0.170 ± 0.003
5	2.37	0.333 ± 0.060
6	1.04	0.031 ± 0.001
7	0.424	0.101 ± 0.002
8	0.195	0.006 ± 0.000

Average Half-life : 11.47 ± 8.90 s

#	Half-life [s]	Relative abundance a(i)
1	55.6 ± 0.045	0.027 ± 0.001
2	23.6 ± 0.640	0.259 ± 0.013
3	9.71 ± 0.490	0.111 ± 0.012
4	3.27 ± 0.280	0.225 ± 0.044
5	2.14 ± 0.320	0.209 ± 0.044
6	0.542 ± 0.110	0.169 ± 0.021

Average Half-life : 9.97 ± .43 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.022 ± 0.003
2	24.5	0.249 ± 0.014
3	16.3	0.044 ± 0.001
4	5.21	0.225 ± 0.033
5	2.37	0.225 ± 0.056
6	1.04	0.142 ± 0.003
7	0.424	0.093 ± 0.016

Average Half-life : 9.95 ± .44 s

Energy: Fast Spectrum

5-Groups
Original Model - R. PERRY, C. L. BAILEY, S. L. FRIEDMAN, D. H. FRISCH, and H. T. RICHARDS, Absolute Yield of Delayed Neutrons from Plutonium Fission, with Fast-Neutron Excitation, Los Alamos Scientific Laboratory report LA-539 (U), Los Alamos, NM (March 12, 1946).

#	Half-life [s]	Relative abundance a(i)
1	55.4 ± 0.000	0.001 ± 0.000
2	22.5 ± 0.000	0.026 ± 0.003
3	5.50 ± 0.000	0.087 ± 0.009
4	1.73 ± 0.000	0.280 ± 0.028
5	0.312 ± 0.000	0.605 ± 0.061

Average Half-life : 1.80 ± .09 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.004 ± 0.000
2	24.5	0.000 ± 0.000
3	16.3	0.031 ± 0.004
4	5.21	0.055 ± 0.001
5	2.37	0.226 ± 0.024
6	1.04	0.000 ± 0.000
7	0.424	0.524 ± 0.052
8	0.195	0.159 ± 0.036

Average Half-life : 1.82 ± .09 s

#	Half-life [s]	Relative abundance a(i)
1	53.7 ± 3.600	0.037 ± 0.016
2	22.9 ± 1.100	0.265 ± 0.037
3	6.11 ± 0.240	0.193 ± 0.019
4	2.14 ± 0.060	0.378 ± 0.013
5	0.400 ± 0.030	0.120 ± 0.007
6	0.150 ± 0.050	0.007 ± 0.004

Average Half-life : 10.09 ± 1.26 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.034 ± 0.016
2	24.5	0.194 ± 0.035
3	16.3	0.105 ± 0.012
4	5.21	0.154 ± 0.021
5	2.37	0.347 ± 0.007
6	1.04	0.044 ± 0.008
7	0.424	0.104 ± 0.002
8	0.195	0.018 ± 0.006

Average Half-life : 10.10 ± 1.26 s

#	Half-life [s]	Relative abundance a(i)
1	55.6 ± 0.000	0.031 ± 0.002
2	22.0 ± 0.000	0.304 ± 0.013
3	4.51 ± 0.000	0.317 ± 0.014
4	1.52 ± 0.000	0.293 ± 0.024
5	0.430 ± 0.000	0.055 ± 0.018

Average Half-life : 10.31 ± .32 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.029 ± 0.002
2	24.5	0.208 ± 0.010
3	16.3	0.110 ± 0.009
4	5.21	0.190 ± 0.008
5	2.37	0.293 ± 0.020
6	1.04	0.125 ± 0.018
7	0.424	0.046 ± 0.017

Average Half-life : 10.31 ± .31 s

Energy: Fission Spectrum

#	Half-life [s]	Relative abundance a(i)
1	53.8 ± 0.950	0.038 ± 0.003
2	22.3 ± 0.360	0.280 ± 0.004
3	5.19 ± 0.120	0.216 ± 0.018
4	2.09 ± 0.080	0.328 ± 0.010
5	0.549 ± 0.049	0.103 ± 0.009
6	0.216 ± 0.017	0.035 ± 0.005

Average Half-life : 10.16 ± .24 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.032 ± 0.003
2	24.5	0.214 ± 0.004
3	16.3	0.082 ± 0.002
4	5.21	0.178 ± 0.019
5	2.37	0.308 ± 0.010
6	1.04	0.084 ± 0.002
7	0.424	0.078 ± 0.008
8	0.195	0.023 ± 0.004

Average Half-life : 10.16 ± .24 s

Energy: Fast Spectrum

#	Half-life [s]	Relative abundance a(i)
1	55.0 ± 0.870	0.030 ± 0.002
2	23.0 ± 0.230	0.294 ± 0.006
3	5.87 ± 0.500	0.181 ± 0.039
4	2.19 ± 0.120	0.373 ± 0.025
5	0.425 ± 0.140	0.108 ± 0.091
6	0.189 ± 0.190	0.014 ± 0.042

Average Half-life : 10.34 ± .32 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.029 ± 0.002
2	24.5	0.225 ± 0.005
3	16.3	0.095 ± 0.010
4	5.21	0.149 ± 0.043
5	2.37	0.351 ± 0.007
6	1.04	0.037 ± 0.019
7	0.424	0.097 ± 0.091
8	0.195	0.017 ± 0.039

Average Half-life : 10.34 ± .32 s

Energy: 3.8 MeV

5-Groups
Original Model - B. P. MAKSYUTENKO, Delayed Neutrons from 239Pu, Iadernaia Fizika (English Translation), 15, No. 2, 848 (August 1, 1963).

#	Half-life [s]	Relative abundance a(i)
1	55 ± 0.000	0.051 ± 0.001
2	24 ± 0.000	0.206 ± 0.002
3	15.5 ± 0.000	0.102 ± 0.001
4	5.2 ± 0.000	0.227 ± 0.032
5	2.2 ± 0.000	0.415 ± 0.053

Average Half-life : 11.39 ± .22 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.052 ± 0.001
2	24.5	0.162 ± 0.003
3	16.3	0.158 ± 0.003
4	5.21	0.175 ± 0.026
5	2.37	0.441 ± 0.056
6	1.04	0.012 ± 0.0003

Average Half-life : 11.40 ± .22 s

Energy: 5.5 MeV

#	Half-life [s]	Relative abundance a(i)
1	55.0 ± 0.000	0.056 ± 0.006
2	24.0 ± 0.000	0.197 ± 0.007
3	15.5 ± 0.000	0.103 ± 0.008
4	5.20 ± 0.000	0.208 ± 0.011
5	2.20 ± 0.000	0.435 ± 0.020

Average Half-life : 11.47 ± .38 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.058 ± 0.006
2	24.5	0.154 ± 0.006
3	16.3	0.160 ± 0.008
4	5.21	0.153 ± 0.010
5	2.37	0.463 ± 0.020
6	1.04	0.013 ± 0.005

Average Half-life : 11.48 ± .38 s

Energy: 6.5 MeV

#	Half-life [s]	Relative abundance a(i)
1	55.0 ± 0.000	0.052 ± 0.005
2	24.0 ± 0.000	0.189 ± 0.005
3	15.5 ± 0.000	0.101 ± 0.007
4	5.20 ± 0.000	0.172 ± 0.012
5	2.20 ± 0.000	0.486 ± 0.030

Average Half-life : 10.92 ± .34 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.054 ± 0.005
2	24.5	0.143 ± 0.004
3	16.3	0.161 ± 0.008
4	5.21	0.110 ± 0.010
5	2.37	0.517 ± 0.030
6	1.04	0.015 ± 0.007

Average Half-life : 10.94 ± .34 s

Energy: 7.0 MeV

#	Half-life [s]	Relative abundance a(i)
1	55.0 ± 0.000	0.061 ± 0.006
2	24.0 ± 0.000	0.194 ± 0.007
3	15.5 ± 0.000	0.108 ± 0.010
4	5.20 ± 0.000	0.262 ± 0.016
5	2.20 ± 0.000	0.376 ± 0.024

Average Half-life : 11.86 ± .41 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.062 ± 0.006
2	24.5	0.154 ± 0.006
3	16.3	0.159 ± 0.010
4	5.21	0.215 ± 0.015
5	2.37	0.400 ± 0.024
6	1.04	0.011 ± 0.006

Average Half-life : 11.87 ± .41 s

Energy: 7.5 MeV

#	Half-life [s]	Relative abundance a(i)
1	55.0 ± 0.000	0.051 ± 0.005
2	24.0 ± 0.000	0.161 ± 0.006
3	15.5 ± 0.000	0.108 ± 0.008
4	5.20 ± 0.000	0.113 ± 0.012
5	2.20 ± 0.000	0.566 ± 0.025

Average Half-life : 10.20 ± .35 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.054 ± 0.005
2	24.5	0.111 ± 0.006
3	16.3	0.175 ± 0.009
4	5.21	0.042 ± 0.010
5	2.37	0.602 ± 0.025
6	1.04	0.017 ± 0.006

Average Half-life : 10.22 ± .35 s

Energy: 7.8 MeV

#	Half-life [s]	Relative abundance a(i)
1	55.0 ± 0.000	0.060 ± 0.006
2	24.0 ± 0.000	0.229 ± 0.007
3	15.5 ± 0.000	0.108 ± 0.009
4	5.20 ± 0.000	0.227 ± 0.016
5	2.20 ± 0.000	0.377 ± 0.040

Average Half-life : 12.47 ± .41 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.061 ± 0.006
2	24.5	0.186 ± 0.006
3	16.3	0.162 ± 0.010
4	5.21	0.179 ± 0.013
5	2.37	0.401 ± 0.040
6	1.04	0.011 ± 0.010

Average Half-life : 12.48 ± .41 s

Energy: 15 MeV

6-Groups
Original Model - B. P. MAKSYUTENKO, Delayed Neutrons from 239Pu, Iadernaia Fizika (English Translation), 15, No. 2, 848 (August 1, 1963).

#	Half-life [s]	Relative abundance a(i)
1	55.0 ± 0.000	0.054 ± 0.001
2	24.0 ± 0.000	0.133 ± 0.002
3	15.5 ± 0.000	0.074 ± 0.005
4	5.20 ± 0.000	0.186 ± 0.002
5	2.20 ± 0.000	0.392 ± 0.022
6	0.500 ± 0.000	0.162 ± 0.110

Average Half-life : 9.18 ± .13 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.049 ± 0.001
2	24.5	0.145 ± 0.003
3	16.3	0.053 ± 0.004
4	5.21	0.212 ± 0.007
5	2.37	0.312 ± 0.006
6	1.04	0.121 ± 0.048
7	0.424	0.108 ± 0.100

Average Half-life : 9.18 ± .13 s

Energy: 18 MeV

#	Half-life [s]	Relative abundance a(i)
1	55.7 ± 0.000	0.038 ± 0.004
2	24.4 ± 0.000	0.111 ± 0.004
3	15.9 ± 0.000	0.072 ± 0.006
4	11.3 ± 0.000	0.071 ± 0.007
5	6.05 ± 0.000	0.036 ± 0.018
6	4.45 ± 0.000	0.139 ± 0.011
7	2.67 ± 0.000	0.160 ± 0.007
8	2.02 ± 0.000	0.116 ± 0.029
9	1.7 ± 0.000	0.093 ± 0.039
10	1.6 ± 0.000	0.087 ± 0.047
11	1.3 ± 0.000	0.077 ± 0.008

Average Half-life : 8.67 ± .31 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.048 ± 0.004
2	24.5	0.013 ± 0.000
3	16.3	0.245 ± 0.011
4	5.21	0.074 ± 0.010
5	2.37	0.531 ± 0.058
6	1.04	0.090 ± 0.042

Average Half-life : 8.70 ± .31 s

Energy: 18.2 MeV

#	Half-life [s]	Relative abundance a(i)
1	55.7 ± 0.000	0.035 ± 0.004
2	24.4 ± 0.000	0.179 ± 0.002
3	15.9 ± 0.000	0.148 ± 0.003
4	11.3 ± 0.000	0.063 ± 0.004
5	6.05 ± 0.000	0.113 ± 0.006
6	4.45 ± 0.000	0.021 ± 0.002
7	2.67 ± 0.000	0.007 ± 0.001
8	2.02 ± 0.000	0.021 ± 0.002
9	1.7 ± 0.000	0.083 ± 0.024
10	1.6 ± 0.000	0.152 ± 0.021
11	1.3 ± 0.000	0.177 ± 0.009

Average Half-life : 10.85 ± .22 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.059 ± 0.004
2	24.5	0.006 ± 0.0001
3	16.3	0.401 ± 0.005
4	5.21	0.006 ± 0.000
5	2.37	0.350 ± 0.025
6	1.04	0.178 ± 0.023

Average Half-life : 11.00 ± .22 s

Energy: 18.5 MeV

#	Half-life [s]	Relative abundance a(i)
1	55.7 ± 0.000	0.062 ± 0.006
2	24.4 ± 0.000	0.104 ± 0.005
3	15.9 ± 0.000	0.212 ± 0.004
4	11.3 ± 0.000	0.003 ± 0.000
5	6.05 ± 0.000	0.006 ± 0.001
6	4.45 ± 0.000	0.135 ± 0.012
7	2.67 ± 0.000	0.451 ± 0.012
8	2.02 ± 0.000	0.025 ± 0.003
9	1.7 ± 0.000	0.002 ± 0.000
10	1.6 ± 0.000	0.001 ± 0.000
11	1.3 ± 0.000	0.000 ± -0.10E-04*

Average Half-life : 11.28 ± .38 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.048 ± 0.006
2	24.5	0.210 ± 0.005
3	16.3	0.059 ± 0.001
4	5.21	0.289 ± 0.012
5	2.37	0.389 ± 0.012
6	1.04	0.005 ± 0.000

Average Half-life : 11.21 ± .38 s

Energy: 18.8 MeV

#	Half-life [s]	Relative abundance a(i)
1	55.7 ± 0.000	0.036 ± 0.004
2	24.4 ± 0.000	0.116 ± 0.001
3	15.9 ± 0.000	0.050 ± 0.002
4	11.3 ± 0.000	0.037 ± 0.002
5	6.05 ± 0.000	0.042 ± 0.004
6	4.45 ± 0.000	0.055 ± 0.004
7	2.67 ± 0.000	0.178 ± 0.004
8	2.02 ± 0.000	0.201 ± 0.005
9	1.7 ± 0.000	0.135 ± 0.008
10	1.6 ± 0.000	0.108 ± 0.010
11	1.3 ± 0.000	0.042 ± 0.023

Average Half-life : 7.88 ± .21 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.039 ± 0.004
2	24.5	0.068 ± 0.001
3	16.3	0.148 ± 0.002
4	5.21	0.004 ± 0.0001
5	2.37	0.642 ± 0.018
6	1.04	0.100 ± 0.022

Average Half-life : 7.87 ± .21 s

Energy: 19.0 MeV

#	Half-life [s]	Relative abundance a(i)
1	55.7 ± 0.000	0.027 ± 0.003
2	24.4 ± 0.000	0.159 ± 0.001
3	15.9 ± 0.000	0.014 ± 0.000
4	11.3 ± 0.000	0.032 ± 0.003
5	6.05 ± 0.000	0.071 ± 0.004
6	4.45 ± 0.000	0.052 ± 0.006
7	2.67 ± 0.000	0.116 ± 0.007
8	2.02 ± 0.000	0.177 ± 0.008
9	1.70 ± 0.000	0.153 ± 0.010
10	1.60 ± 0.000	0.134 ± 0.012
11	1.30 ± 0.000	0.065 ± 0.026

Average Half-life : 7.86 ± .17 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.030 ± 0.003
2	24.5	0.109 ± 0.002
3	16.3	0.118 ± 0.002
4	5.21	0.003 ± 0.001
5	2.37	0.613 ± 0.022
6	1.04	0.127 ± 0.025

Average Half-life : 7.85 ± .17 s

Energy: 19.5 MeV

#	Half-life [s]	Relative abundance a(i)
1	55.7 ± 0.000	0.037 ± 0.004
2	24.4 ± 0.000	0.192 ± 0.001
3	15.9 ± 0.000	0.050 ± 0.002
4	11.3 ± 0.000	0.027 ± 0.004
5	6.05 ± 0.000	0.052 ± 0.005
6	4.45 ± 0.000	0.080 ± 0.006
7	2.67 ± 0.000	0.170 ± 0.006
8	2.02 ± 0.000	0.162 ± 0.009
9	1.7 ± 0.000	0.109 ± 0.012
10	1.6 ± 0.000	0.088 ± 0.017
11	1.3 ± 0.000	0.034 ± 0.003

Average Half-life : 9.69 ± .22 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.046 ± 0.004
2	24.5	0.107 ± 0.002
3	16.3	0.184 ± 0.003
4	5.21	0.019 ± 0.006
5	2.37	0.571 ± 0.020
6	1.04	0.073 ± 0.014

Average Half-life : 9.72 ± .22 s

Energy: 20.0 MeV

#	Half-life [s]	Relative abundance a(i)
1	55.7 ± 0.000	0.035 ± 0.004
2	24.4 ± 0.000	0.223 ± 0.001
3	15.9 ± 0.000	0.018 ± 0.001
4	11.3 ± 0.000	0.019 ± 0.001
5	6.05 ± 0.000	0.110 ± 0.004
6	4.45 ± 0.000	0.130 ± 0.005
7	2.67 ± 0.000	0.074 ± 0.009
8	2.02 ± 0.000	0.074 ± 0.013
9	1.7 ± 0.000	0.089 ± 0.014
10	1.6 ± 0.000	0.097 ± 0.016
11	1.3 ± 0.000	0.131 ± 0.020

Average Half-life : 9.93 ± .21 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.046 ± 0.003
2	24.5	0.117 ± 0.002
3	16.3	0.178 ± 0.004
4	5.21	0.083 ± 0.002
5	2.37	0.453 ± 0.022
6	1.04	0.122 ± 0.026

Average Half-life : 9.97 ± .20 s

Energy: 20.5 MeV

#	Half-life [s]	Relative abundance a(i)
1	55.7 ± 0.000	0.030 ± 0.003
2	24.4 ± 0.000	0.142 ± 0.001
3	15.9 ± 0.000	0.050 ± 0.003
4	11.3 ± 0.000	0.027 ± 0.004
5	6.05 ± 0.000	0.029 ± 0.007
6	4.45 ± 0.000	0.036 ± 0.008
7	2.67 ± 0.000	0.087 ± 0.009
8	2.02 ± 0.000	0.171 ± 0.009
9	1.7 ± 0.000	0.184 ± 0.010
10	1.6 ± 0.000	0.169 ± 0.012
11	1.3 ± 0.000	0.076 ± 0.025

Average Half-life : 7.81 ± .20 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.018 ± 0.003
2	24.5	0.195 ± 0.004
3	16.3	0.023 ± 0.0005
4	5.21	0.002 ± 0.008
5	2.37	0.596 ± 0.023
6	1.04	0.167 ± 0.023

Average Half-life : 7.74 ± .19 s

Energy: 21.0 MeV

#	Half-life [s]	Relative abundance a(i)
1	55.7 ± 0.000	0.042 ± 0.004
2	24.4 ± 0.000	0.245 ± 0.001
3	15.9 ± 0.000	0.046 ± 0.004
4	11.3 ± 0.000	0.029 ± 0.006
5	6.05 ± 0.000	0.044 ± 0.008
6	4.45 ± 0.000	0.093 ± 0.007
7	2.67 ± 0.000	0.279 ± 0.007
8	2.02 ± 0.000	0.151 ± 0.014
9	1.7 ± 0.000	0.044 ± 0.030
10	1.6 ± 0.000	0.025 ± 0.003
11	1.3 ± 0.000	0.002 ± 0.0002

Average Half-life : 11.24 ± .27 s

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.045 ± 0.004
2	24.5	0.216 ± 0.004
3	16.3	0.100 ± 0.002
4	5.21	0.127 ± 0.010
5	2.37	0.493 ± 0.028
6	1.04	0.020 ± 0.020

Average Half-life : 11.25 ± .26 s

Energy: Thermal spectrum

6-Groups
Original Model - V.M. Piksaikin, A.S. Egorov, K.V. Mitrofanov. THE ABSOLUTE TOTAL DELAYED NEUTRON YIELDS, RELATIVE ABUNDANCES AND HALF-LIVES OF DELAYED NEUTRON GROUPS FROM NEUTRON INDUCED FISSION OF 232Th, 233U, 236U, 239Pu AND 241Am. INDC(NDS) - 0646, 2013; V.M. Piksaikin, L.E. Kazakov, S.G. Isaev, M.Z. Tarasko, V.A.Roshchenko, G.D. Spriggs, J.M. Campbell, Energy Dependence of Relative Abundances and Periods of Delayed Neutrons from Neutron Induced Fission of U-235, U-238, Pu-239 in 6- and 8-group Model Representation, Progress in Nuclear Energy, 2002, v.41, No.1-4, pp.203-222; V.M. Piksaikin et al., Relative abundances and periods of delayed neutrons from fission of U-233, U235 and Pu-239 by epithermal neutrons, Atomic energy, 2002, N0.2, pp.135-142. (in Russian) V. M. Piksaikin, L. E. Kazakov et al.,RELATIVE YIELD AND PERIOD OF INDIVIDUAL GROUPS OF DELAYED NEUTRONS IN 233U, 235U AND 239Pu FISSION BY EPITHERMAL NEUTRONS, Atomic Energy, Vol. 92, No. 2, 2002.(in English)

#	Half-life [s]	Relative abundance a(i)
1	53.2 ± 0.464	0.035 ± 0.001
2	22.6 ± 0.107	0.302 ± 0.007
3	5.59 ± 0.084	0.204 ± 0.005
4	2.17 ± 0.040	0.332 ± 0.006
5	0.621 ± 0.022	0.084 ± 0.003
6	0.256 ± 0.009	0.043 ± 0.002

Average Half-life : 10.59 ± 0.17 s

Correlation matrix

	a1	T1	a2	T2	a3	T3	a4	T4	a5	T5	a6	T6
a1	1
T1	0	1
a2	0	0.82	1
T2	0	-0.05	0.19	1
a3	0	0.32	0.46	0.34	1
T3	0	-0.09	-0.11	0.65	-0.27	1
a4	0	0.5	0.64	0.5	-0.03	0.54	1
T4	0	0.06	0.11	0	-0.53	0.09	0.17	1
a5	0	0.09	0.12	0.06	0.01	0.03	-0.04	0.21	1
T5	0	0.04	0.05	0.05	0.01	0.05	-0.07	0.08	0.01	1
a6	0	0.02	0.03	0.01	0	0	0	0.05	-0.02	0.01	1
T6	0	0.03	0.03	0.02	0	0.01	-0.01	0.06	-0.02	0	0	1

8-Groups
Expanded Model using a fixed set of Half-lives

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.029 ± 0.001
2	24.5	0.240 ± 0.008
3	16.3	0.083 ± 0.004
4	5.21	0.188 ± 0.007
5	2.37	0.289 ± 0.010
6	1.04	0.089 ± 0.004
7	0.424	0.059 ± 0.003
8	0.195	0.023 ± 0.001

Average Half-life : 10.63 ± 0.22

Energy: 0.37MeV

6-Groups
Original Model - V.M. Piksaikin, A.S. Egorov, K.V. Mitrofanov. THE ABSOLUTE TOTAL DELAYED NEUTRON YIELDS, RELATIVE ABUNDANCES AND HALF-LIVES OF DELAYED NEUTRON GROUPS FROM NEUTRON INDUCED FISSION OF 232Th, 233U, 236U, 239Pu AND 241Am. INDC(NDS) - 0646, 2013 V.M. Piksaikin et al., Energy dependence of relative abundances and periods of delayed neutrons from fission of Pu-239 in the energy range of primary neutrons from o.37 to 4.97 MeV, Atomic Energy, 2002, No.3, pp.233-239; V.M. Piksaikin, L.E. Kazakov, S.G. Isaev, M.Z. Tarasko, V.A.Roshchenko, G.D. Spriggs, J.M. Campbell, Energy Dependence of Relative Abundances and Periods of Delayed Neutrons from Neutron Induced Fission of U-235, U-238, Pu-239 in 6- and 8-group Model Representation, Progress in Nuclear Energy, 2002, v.41, No.1-4, pp.203-222.

#	Half-life [s]	Relative abundance a(i)
1	52.1 ± 0.407	0.037 ± 0.001
2	22.3 ± 0.106	0.295 ± 0.006
3	5.26 ± 0.071	0.212 ± 0.005
4	2.06 ± 0.036	0.319 ± 0.005
5	0.543 ± 0.015	0.103 ± 0.003
6	0.218 ± 0.006	0.034 ± 0.001

Average Half-life : 10.36 ± 0.15 s

Correlation matrix

	a1	T1	a2	T2	a3	T3	a4	T4	a5	T5	a6	T6
a1	1
T1	0	1
a2	0	0.77	1
T2	0	-0.18	0.09	1
a3	0	0.26	0.41	0.33	1
T3	0	-0.13	-0.16	0.65	-0.22	1
a4	0	0.43	0.6	0.45	-0.07	0.51	1
T4	0	0.08	0.14	0.01	-0.46	0	0.12	1
a5	0	0.08	0.11	0.06	0.02	0.03	-0.05	0.19	1
T5	0	0.04	0.06	0.05	0.01	0.05	-0.07	0.09	0	1
a6	0	0.01	0.02	0.01	0	0	0	0.03	-0.01	0	1
T6	0	0.01	0.02	0.01	0	0	0	0.04	-0.01	0	0	1

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.028 ± 0.001
2	24.5	0.236 ± 0.008
3	16.3	0.078 ± 0.003
4	5.21	0.182 ± 0.007
5	2.37	0.284 ± 0.010
6	1.04	0.097 ± 0.005
7	0.424	0.071 ± 0.004
8	0.195	0.024 ± 0.001

Average Half-life :

Energy: 0.62MeV

6-Groups
Original Model - V.M. Piksaikin, A.S. Egorov, K.V. Mitrofanov. THE ABSOLUTE TOTAL DELAYED NEUTRON YIELDS, RELATIVE ABUNDANCES AND HALF-LIVES OF DELAYED NEUTRON GROUPS FROM NEUTRON INDUCED FISSION OF 232Th, 233U, 236U, 239Pu AND 241Am. INDC(NDS) - 0646, 2013 V.M. Piksaikin et al., Energy dependence of relative abundances and periods of delayed neutrons from fission of Pu-239 in the energy range of primary neutrons from o.37 to 4.97 MeV, Atomic Energy, 2002, No.3, pp.233-239; V.M. Piksaikin, L.E. Kazakov, S.G. Isaev, M.Z. Tarasko, V.A.Roshchenko, G.D. Spriggs, J.M. Campbell, Energy Dependence of Relative Abundances and Periods of Delayed Neutrons from Neutron Induced Fission of U-235, U-238, Pu-239 in 6- and 8-group Model Representation, Progress in Nuclear Energy, 2002, v.41, No.1-4, pp.203-222.

#	Half-life [s]	Relative abundance a(i)
1	53.2 ± 0.487	0.037 ± 0.001
2	22.4 ± 0.123	0.295 ± 0.007
3	5.30 ± 0.081	0.217 ± 0.006
4	2.10 ± 0.043	0.321 ± 0.007
5	0.568 ± 0.020	0.096 ± 0.003
6	0.214 ± 0.008	0.034 ± 0.001

Average Half-life : 10.47 ± 0.18 s

Correlation matrix

	a1	T1	a2	T2	a3	T3	a4	T4	a5	T5	a6	T6
a1	1
T1	0	1
a2	0	0.79	1
T2	0	-0.14	0.12	1
a3	0	0.29	0.44	0.35	1
T3	0	-0.13	-0.16	0.64	-0.22	1
a4	0	0.45	0.6	0.45	-0.05	0.5	1
T4	0	0.07	0.13	-0.01	-0.48	-0.01	0.13	1
a5	0	0.09	0.12	0.07	0.02	0.03	-0.05	0.21	1
T5	0	0.05	0.06	0.05	0.01	0.05	-0.07	0.1	0	1
a6	0	0.01	0.02	0.01	0	0	0	0.03	-0.01	0.01	1
T6	0	0.02	0.02	0.01	0	0	0	0.04	-0.01	0	0	1

8-Groups
Expanded Model using a fixed set of Half-lives

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.030 ± 0.001
2	24.5	0.231 ± 0.008
3	16.3	0.083 ± 0.004
4	5.21	0.184 ± 0.007
5	2.37	0.294 ± 0.010
6	1.04	0.088 ± 0.004
7	0.424	0.068 ± 0.003
8	0.195	0.022 ± 0.001

Average Half-life : 10.46 ± 0.22

Energy: 0.86MeV

6-Groups
Original Model - V.M. Piksaikin, A.S. Egorov, K.V. Mitrofanov. THE ABSOLUTE TOTAL DELAYED NEUTRON YIELDS, RELATIVE ABUNDANCES AND HALF-LIVES OF DELAYED NEUTRON GROUPS FROM NEUTRON INDUCED FISSION OF 232Th, 233U, 236U, 239Pu AND 241Am. INDC(NDS) - 0646, 2013 V.M. Piksaikin et al., Energy dependence of relative abundances and periods of delayed neutrons from fission of Pu-239 in the energy range of primary neutrons from o.37 to 4.97 MeV, Atomic Energy, 2002, No.3, pp.233-239; V.M. Piksaikin, L.E. Kazakov, S.G. Isaev, M.Z. Tarasko, V.A.Roshchenko, G.D. Spriggs, J.M. Campbell, Energy Dependence of Relative Abundances and Periods of Delayed Neutrons from Neutron Induced Fission of U-235, U-238, Pu-239 in 6- and 8-group Model Representation, Progress in Nuclear Energy, 2002, v.41, No.1-4, pp.203-222.

#	Half-life [s]	Relative abundance a(i)
1	53.8 ± 0.408	0.037 ± 0.001
2	22.2 ± 0.103	0.288 ± 0.005
3	5.25 ± 0.067	0.216 ± 0.005
4	2.06 ± 0.034	0.321 ± 0.005
5	0.547 ± 0.016	0.102 ± 0.003
6	0.217 ± 0.006	0.034 ± 0.001

Average Half-life : 10.27 ± 0.13 s

Correlation matrix

	a1	T1	a2	T2	a3	T3	a4	T4	a5	T5	a6	T6
a1	1
T1	0	1
a2	0	0.76	1
T2	0	-0.16	0.07	1
a3	0	0.26	0.41	0.34	1
T3	0	-0.13	-0.18	0.64	-0.22	1
a4	0	0.43	0.58	0.44	-0.07	0.51	1
T4	0	0.07	0.14	0	-0.48	0.01	0.12	1
a5	0	0.08	0.11	0.07	0.01	0.03	-0.05	0.2	1
T5	0	0.05	0.06	0.05	0.01	0.05	-0.07	0.1	0	1
a6	0	0.01	0.02	0.01	0	0	0	0.03	-0.01	0	1
T6	0	0.01	0.02	0.01	0	0	0	0.04	-0.01	0	0	1

8-Groups
Expanded Model using a fixed set of Half-lives

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.032 ± 0.001
2	24.5	0.212 ± 0.007
3	16.3	0.097 ± 0.004
4	5.21	0.173 ± 0.007
5	2.37	0.300 ± 0.010
6	1.04	0.088 ± 0.004
7	0.424	0.076 ± 0.004
8	0.195	0.022 ± 0.001

Average Half-life : 10.29±0.20 s

Energy: 1.06MeV

6-Groups
Original Model - V.M. Piksaikin, A.S. Egorov, K.V. Mitrofanov. THE ABSOLUTE TOTAL DELAYED NEUTRON YIELDS, RELATIVE ABUNDANCES AND HALF-LIVES OF DELAYED NEUTRON GROUPS FROM NEUTRON INDUCED FISSION OF 232Th, 233U, 236U, 239Pu AND 241Am. INDC(NDS) - 0646, 2013 V.M. Piksaikin et al., Energy dependence of relative abundances and periods of delayed neutrons from fission of Pu-239 in the energy range of primary neutrons from o.37 to 4.97 MeV, Atomic Energy, 2002, No.3, pp.233-239; V.M. Piksaikin, L.E. Kazakov, S.G. Isaev, M.Z. Tarasko, V.A.Roshchenko, G.D. Spriggs, J.M. Campbell, Energy Dependence of Relative Abundances and Periods of Delayed Neutrons from Neutron Induced Fission of U-235, U-238, Pu-239 in 6- and 8-group Model Representation, Progress in Nuclear Energy, 2002, v.41, No.1-4, pp.203-222.

#	Half-life [s]	Relative abundance a(i)
1	53.5 ± 0.333	0.038 ± 0.001
2	22.2 ± 0.085	0.292 ± 0.004
3	5.11 ± 0.055	0.214 ± 0.004
4	2.15 ± 0.029	0.321 ± 0.004
5	0.555 ± 0.012	0.101 ± 0.002
6	0.215 ± 0.005	0.035 ± 0.001

Average Half-life : 10.37 ± 0.11 s

Correlation matrix

	a1	T1	a2	T2	a3	T3	a4	T4	a5	T5	a6	T6
a1	1
T1	0	1
a2	0	0.75	1
T2	0	-0.18	0.06	1
a3	0	0.25	0.4	0.35	1
T3	0	-0.13	-0.19	0.63	-0.18	1
a4	0	0.42	0.59	0.43	-0.07	0.47	1
T4	0	0.08	0.15	0.01	-0.43	-0.06	0.1	1
a5	0	0.07	0.1	0.06	0.02	0.03	-0.05	0.18	1
T5	0	0.04	0.06	0.05	0	0.05	-0.07	0.09	0	1
a6	0	0.01	0.02	0.01	0	0	0	0.02	-0.01	0	1
T6	0	0.01	0.02	0.01	0	0	0	0.03	-0.01	0	0	1

8-Groups
Expanded Model using a fixed set of Half-lives

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.032 ± 0.001
2	24.5	0.220 ± 0.008
3	16.3	0.089 ± 0.004
4	5.21	0.172 ± 0.007
5	2.37	0.322 ± 0.010
6	1.04	0.061 ± 0.003
7	0.424	0.084 ± 0.004
8	0.195	0.020 ± 0.001

Average Half-life : 10.38 ± 0.22 s

Energy: 3.27MeV

6-Groups
Original Model - V.M. Piksaikin, A.S. Egorov, K.V. Mitrofanov. THE ABSOLUTE TOTAL DELAYED NEUTRON YIELDS, RELATIVE ABUNDANCES AND HALF-LIVES OF DELAYED NEUTRON GROUPS FROM NEUTRON INDUCED FISSION OF 232Th, 233U, 236U, 239Pu AND 241Am. INDC(NDS) - 0646, 2013 V.M. Piksaikin et al., Energy dependence of relative abundances and periods of delayed neutrons from fission of Pu-239 in the energy range of primary neutrons from o.37 to 4.97 MeV, Atomic Energy, 2002, No.3, pp.233-239; V.M. Piksaikin, L.E. Kazakov, S.G. Isaev, M.Z. Tarasko, V.A.Roshchenko, G.D. Spriggs, J.M. Campbell, Energy Dependence of Relative Abundances and Periods of Delayed Neutrons from Neutron Induced Fission of U-235, U-238, Pu-239 in 6- and 8-group Model Representation, Progress in Nuclear Energy, 2002, v.41, No.1-4, pp.203-222.

#	Half-life [s]	Relative abundance a(i)
1	55.3 ± 1.449	0.038 ± 0.001
2	22.2 ± 0.288	0.271 ± 0.007
3	5.11 ± 0.128	0.220 ± 0.006
4	2.16 ± 0.056	0.331 ± 0.008
5	0.547 ± 0.016	0.104 ± 0.003
6	0.216 ± 0.006	0.035 ± 0.001

Average Half-life : 10.06 ± 0.19 s

Correlation matrix

	a1	T1	a2	T2	a3	T3	a4	T4	a5	T5	a6	T6
a1	1
T1	0	1
a2	0	0.12	1
T2	0	-0.26	-0.25	1
a3	0	-0.01	0.14	0.33	1
T3	0	0.01	-0.21	0.29	0	1
a4	0	-0.01	0.28	0.24	-0.07	0.18	1
T4	0	-0.02	0.08	0.22	-0.1	-0.04	-0.01	1
a5	0	0	0.03	0.02	0	0.02	-0.03	0.02	1
T5	0	0	0.03	0.02	0	0.02	-0.02	0.01	0	1
a6	0	0	0	0	0	0	0	0	0	0	1
T6	0	0	0.01	0	0	0	-0.01	0	0	0	0	1

8-Groups
Expanded Model using a fixed set of Half-lives

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.036 ± 0.001
2	24.5	0.190 ± 0.007
3	16.3	0.099 ± 0.004
4	5.21	0.167 ± 0.007
5	2.37	0.346 ± 0.011
6	1.04	0.051 ± 0.003
7	0.424	0.093 ± 0.005
8	0.195	0.018 ± 0.001

Average Half-life : 10.06 ± 0.20 s

Energy: 3.81MeV

6-Groups
Original Model - V.M. Piksaikin, A.S. Egorov, K.V. Mitrofanov. THE ABSOLUTE TOTAL DELAYED NEUTRON YIELDS, RELATIVE ABUNDANCES AND HALF-LIVES OF DELAYED NEUTRON GROUPS FROM NEUTRON INDUCED FISSION OF 232Th, 233U, 236U, 239Pu AND 241Am. INDC(NDS) - 0646, 2013 V.M. Piksaikin et al., Energy dependence of relative abundances and periods of delayed neutrons from fission of Pu-239 in the energy range of primary neutrons from o.37 to 4.97 MeV, Atomic Energy, 2002, No.3, pp.233-239; V.M. Piksaikin, L.E. Kazakov, S.G. Isaev, M.Z. Tarasko, V.A.Roshchenko, G.D. Spriggs, J.M. Campbell, Energy Dependence of Relative Abundances and Periods of Delayed Neutrons from Neutron Induced Fission of U-235, U-238, Pu-239 in 6- and 8-group Model Representation, Progress in Nuclear Energy, 2002, v.41, No.1-4, pp.203-222.

#	Half-life [s]	Relative abundance a(i)
1	56.2 ± 0.526	0.038 ± 0.001
2	22.5 ± 0.137	0.247 ± 0.004
3	5.22 ± 0.065	0.227 ± 0.004
4	2.09 ± 0.032	0.348 ± 0.005
5	0.552 ± 0.012	0.105 ± 0.002
6	0.217 ± 0.005	0.035 ± 0.001

Average Half-life : 9.68 ± 0.11 s

Correlation matrix

	a1	T1	a2	T2	a3	T3	a4	T4	a5	T5	a6	T6
a1	1
T1	0	1
a2	0	0.6	1
T2	0	-0.32	-0.11	1
a3	0	0.13	0.29	0.36	1
T3	0	-0.11	-0.28	0.57	-0.1	1
a4	0	0.27	0.5	0.35	-0.08	0.4	1
T4	0	0.05	0.17	0.1	-0.32	-0.1	0.05	1
a5	0	0.03	0.07	0.04	0.01	0.04	-0.04	0.11	1
T5	0	0.03	0.05	0.04	0	0.05	-0.05	0.06	-0.01	1
a6	0	0.01	0.01	0.01	0	0	0	0.02	-0.01	0	1
T6	0	0.01	0.01	0.01	0	0	-0.01	0.02	-0.01	0	0	1

8-Groups
Expanded Model using a fixed set of Half-lives

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.038 ± 0.001
2	24.5	0.173 ± 0.006
3	16.3	0.090 ± 0.004
4	5.21	0.175 ± 0.007
5	2.37	0.339 ± 0.010
6	1.04	0.082 ± 0.004
7	0.424	0.078 ± 0.004
8	0.195	0.025 ± 0.001

Average Half-life : 9.66 ± 0.18 s

Energy: 4.27MeV

6-Groups
Original Model - V.M. Piksaikin, A.S. Egorov, K.V. Mitrofanov. THE ABSOLUTE TOTAL DELAYED NEUTRON YIELDS, RELATIVE ABUNDANCES AND HALF-LIVES OF DELAYED NEUTRON GROUPS FROM NEUTRON INDUCED FISSION OF 232Th, 233U, 236U, 239Pu AND 241Am. INDC(NDS) - 0646, 2013 V.M. Piksaikin et al., Energy dependence of relative abundances and periods of delayed neutrons from fission of Pu-239 in the energy range of primary neutrons from o.37 to 4.97 MeV, Atomic Energy, 2002, No.3, pp.233-239; V.M. Piksaikin, L.E. Kazakov, S.G. Isaev, M.Z. Tarasko, V.A.Roshchenko, G.D. Spriggs, J.M. Campbell, Energy Dependence of Relative Abundances and Periods of Delayed Neutrons from Neutron Induced Fission of U-235, U-238, Pu-239 in 6- and 8-group Model Representation, Progress in Nuclear Energy, 2002, v.41, No.1-4, pp.203-222.

#	Half-life [s]	Relative abundance a(i)
1	56.7 ± 0.652	0.038 ± 0.001
2	22.5 ± 0.177	0.243 ± 0.005
3	5.31 ± 0.083	0.230 ± 0.005
4	2.10 ± 0.041	0.347 ± 0.006
5	0.554 ± 0.016	0.106 ± 0.003
6	0.217 ± 0.006	0.035 ± 0.001

Average Half-life : 9.65 ± 0.14 s

Correlation matrix

	a1	T1	a2	T2	a3	T3	a4	T4	a5	T5	a6	T6
a1	1
T1	0	1
a2	0	0.62	1
T2	0	-0.28	-0.09	1
a3	0	0.15	0.3	0.37	1
T3	0	-0.11	-0.28	0.59	-0.11	1
a4	0	0.29	0.5	0.38	-0.07	0.43	1
T4	0	0.05	0.17	0.08	-0.35	-0.09	0.07	1
a5	0	0.04	0.07	0.05	0.01	0.04	-0.05	0.12	1
T5	0	0.03	0.05	0.04	0	0.05	-0.05	0.06	0	1
a6	0	0.01	0.01	0.01	0	0	0	0.02	-0.01	0	1
T6	0	0.01	0.01	0.01	0	0	-0.01	0.03	-0.01	0	0	1

8-Groups
Expanded Model using a fixed set of Half-lives

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.039 ± 0.001
2	24.5	0.164 ± 0.006
3	16.3	0.097 ± 0.004
4	5.21	0.179 ± 0.007
5	2.37	0.336 ± 0.010
6	1.04	0.080 ± 0.004
7	0.424	0.082 ± 0.004
8	0.195	0.023 ± 0.001

Average Half-life : 9.62 ± 0.18 s

Energy: 4.81 MeV

6-Groups
Original Model - V.M. Piksaikin, A.S. Egorov, K.V. Mitrofanov. THE ABSOLUTE TOTAL DELAYED NEUTRON YIELDS, RELATIVE ABUNDANCES AND HALF-LIVES OF DELAYED NEUTRON GROUPS FROM NEUTRON INDUCED FISSION OF 232Th, 233U, 236U, 239Pu AND 241Am. INDC(NDS) - 0646, 2013 V.M. Piksaikin et al., Energy dependence of relative abundances and periods of delayed neutrons from fission of Pu-239 in the energy range of primary neutrons from o.37 to 4.97 MeV, Atomic Energy, 2002, No.3, pp.233-239; V.M. Piksaikin, L.E. Kazakov, S.G. Isaev, M.Z. Tarasko, V.A.Roshchenko, G.D. Spriggs, J.M. Campbell, Energy Dependence of Relative Abundances and Periods of Delayed Neutrons from Neutron Induced Fission of U-235, U-238, Pu-239 in 6- and 8-group Model Representation, Progress in Nuclear Energy, 2002, v.41, No.1-4, pp.203-222.

#	Half-life [s]	Relative abundance a(i)
1	57.5 ± 0.487	0.039 ± 0.001
2	22.5 ± 0.139	0.238 ± 0.004
3	5.32 ± 0.066	0.228 ± 0.004
4	2.10 ± 0.033	0.354 ± 0.005
5	0.554 ± 0.014	0.105 ± 0.003
6	0.217 ± 0.005	0.035 ± 0.001

Average Half-life : 9.62 ± 0.11 s

Correlation matrix

	a1	T1	a2	T2	a3	T3	a4	T4	a5	T5	a6	T6
a1	1
T1	0	1
a2	0	0.72	1
T2	0	-0.16	-0.03	1
a3	0	0.23	0.33	0.36	1
T3	0	-0.09	-0.25	0.61	-0.16	1
a4	0	0.4	0.53	0.42	-0.08	0.46	1
T4	0	0.08	0.17	0.04	-0.39	-0.1	0.08	1
a5	0	0.06	0.08	0.06	0.01	0.03	-0.04	0.14	1
T5	0	0.04	0.05	0.05	0	0.05	-0.06	0.07	0	1
a6	0	0.01	0.01	0.01	0	0	0	0.02	-0.01	0	1
T6	0	0.01	0.02	0.01	0	0	-0.01	0.03	-0.01	0	0	1

8-Groups
Expanded Model using a fixed set of Half-lives

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.042 ± 0.002
2	24.5	0.154 ± 0.006
3	16.3	0.102 ± 0.004
4	5.21	0.172 ± 0.007
5	2.37	0.348 ± 0.011
6	1.04	0.078 ± 0.004
7	0.424	0.083 ± 0.004
8	0.195	0.021 ± 0.001

Average Half-life : 9.61 ± 0.20 s

Energy: 4.97 MeV

6-Groups
Original Model - V.M. Piksaikin, A.S. Egorov, K.V. Mitrofanov. THE ABSOLUTE TOTAL DELAYED NEUTRON YIELDS, RELATIVE ABUNDANCES AND HALF-LIVES OF DELAYED NEUTRON GROUPS FROM NEUTRON INDUCED FISSION OF 232Th, 233U, 236U, 239Pu AND 241Am. INDC(NDS) - 0646, 2013 V.M. Piksaikin et al., Energy dependence of relative abundances and periods of delayed neutrons from fission of Pu-239 in the energy range of primary neutrons from o.37 to 4.97 MeV, Atomic Energy, 2002, No.3, pp.233-239; V.M. Piksaikin, L.E. Kazakov, S.G. Isaev, M.Z. Tarasko, V.A.Roshchenko, G.D. Spriggs, J.M. Campbell, Energy Dependence of Relative Abundances and Periods of Delayed Neutrons from Neutron Induced Fission of U-235, U-238, Pu-239 in 6- and 8-group Model Representation, Progress in Nuclear Energy, 2002, v.41, No.1-4, pp.203-222.

#	Half-life [s]	Relative abundance a(i)
1	58.2 ± 0.650	0.039 ± 0.001
2	22.0 ± 0.195	0.243 ± 0.006
3	4.92 ± 0.085	0.232 ± 0.006
4	2.17 ± 0.049	0.341 ± 0.008
5	0.553 ± 0.019	0.109 ± 0.004
6	0.217 ± 0.008	0.036 ± 0.001

Average Half-life : 9.59 ± 0.16 s

Correlation matrix

	a1	T1	a2	T2	a3	T3	a4	T4	a5	T5	a6	T6
a1	1
T1	0	1
a2	0	0.73	1
T2	0	-0.12	-0.01	1
a3	0	0.25	0.34	0.37	1
T3	0	-0.07	-0.24	0.61	-0.14	1
a4	0	0.41	0.53	0.42	-0.09	0.46	1
T4	0	0.07	0.17	0.05	-0.38	-0.11	0.08	1
a5	0	0.06	0.08	0.06	0.01	0.04	-0.04	0.14	1
T5	0	0.04	0.05	0.05	0	0.05	-0.06	0.07	0	1
a6	0	0.01	0.01	0.01	0	0	0	0.02	-0.01	0	1
T6	0	0.01	0.01	0.01	0	0	-0.01	0.02	-0.01	0	0	1

8-Groups
Expanded Model using a fixed set of Half-lives

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.043 ± 0.002
2	24.5	0.138 ± 0.005
3	16.3	0.122 ± 0.004
4	5.21	0.146 ± 0.006
5	2.37	0.399 ± 0.011
6	1.04	0.030 ± 0.002
7	0.424	0.110 ± 0.005
8	0.195	0.012 ± 0.001

Average Half-life : 9.55 ± 0.18 s

Energy: 15.8 MeV

6-Groups
Original Model - Roshchenko V.A., Piksaikin V.M., Kazakov L.E., Korolev G.G. RELATIVE YIELD OF DELAYED NEUTRONS AND HALF-LIFE OF THEIR PRECURSOR NUCLEI WITH FISSIONING OF�239PU BY 14.2-17.9 MEV NEUTRONS. Atomic Energy, 2006. V. 101. ?�6. pp. 897-900.�

#	Half-life [s]	Relative abundance a(i)
1	55.76 ± 0.69	0.054 ± 0.001
2	20.97 ± 0.27	0.186 ± 0.004
3	4.75 ± 0.09	0.241 ± 0.006
4	2.13 ± 0.05	0.362 ± 0.008
5	0.560 ± 0.020	0.118 ± 0.003
6	0.215 ± 0.006	0.039 ± 0.001

Average Half-life : 8.92 ± 0.34 s

Correlation matrix

	a1	T1	a2	T2	a3	T3	a4	T4	a5	T5	a6	T6
a1	1
T1	0	1
a2	0	0.56	1
T2	0	-0.18	-0.16	1
a3	0	0.16	0.2	0.39	1
T3	0	-0.01	-0.33	0.48	-0.06	1
a4	0	0.27	0.39	0.39	-0.1	0.36	1
T4	0	0.04	0.12	0.16	-0.26	-0.16	0.02	1
a5	0	0.04	0.06	0.06	0.01	0.05	-0.05	0.1	1
T5	0	0.03	0.04	0.04	0	0.05	-0.05	0.04	-0.01	1
a6	0	0.01	0.01	0.01	0	0	0	0.01	-0.01	0	1
T6	0	0.01	0.01	0.01	0	0.01	-0.01	0.02	-0.01	0	0	1

Energy: 16.8 MeV

#	Half-life [s]	Relative abundance a(i)
1	55.44 ± 0.73	0.056 ± 0.001
2	20.53 ± 0.26	0.203 ± 0.005
3	4.68 ± 0.09	0.234 ± 0.006
4	2.17 ± 0.05	0.348 ± 0.008
5	0.550 ± 0.020	0.119 ± 0.004
6	0.215 ± 0.006	0.039 ± 0.001

Average Half-life : 9.19 ± 0.35 s

Correlation matrix

	a1	T1	a2	T2	a3	T3	a4	T4	a5	T5	a6	T6
a1	1
T1	0	1
a2	0	0.53	1
T2	0	-0.2	-0.17	1
a3	0	0.14	0.18	0.4	1
T3	0	0	-0.32	0.44	-0.04	1
a4	0	0.23	0.37	0.36	-0.1	0.32	1
T4	0	0.04	0.11	0.2	-0.22	-0.13	0.02	1
a5	0	0.04	0.05	0.05	0.01	0.04	-0.04	0.08	1
T5	0	0.03	0.04	0.04	0	0.05	-0.05	0.04	-0.01	1
a6	0	0	0.01	0.01	0	0	0	0.01	0	0	1
T6	0	0.01	0.01	0.01	0	0.01	-0.01	0.01	0	0	0	1

Energy: 17.9 MeV

#	Half-life [s]	Relative abundance a(i)
1	51.62 ± 0.72	0.056 ± 0.001
2	21.54 ± 0.26	0.229 ± 0.006
3	5.04 ± 0.10	0.233 ± 0.006
4	2.28 ± 0.06	0.318 ± 0.007
5	0.530 ± 0.020	0.124 ± 0.004
6	0.217 ± 0.006	0.040 ± 0.001

Average Half-life : 9.80 ± 0.38 s

Correlation matrix

	a1	T1	a2	T2	a3	T3	a4	T4	a5	T5	a6	T6
a1	1
T1	0	1
a2	0	0.06	1
T2	0	-0.23	-0.1	1
a3	0	0.02	0.05	0.16	1
T3	0	0.03	-0.04	0.11	-0.01	1
a4	0	0.01	0.08	0.12	-0.04	0.03	1
T4	0	0.01	0.03	0.11	-0.03	-0.01	-0.02	1
a5	0	0	0.01	0.01	0	0.01	-0.01	0	1
T5	0	0	0.01	0.01	0	0	-0.01	0	0	1
a6	0	0	0	0	0	0	0	0	0	0	1
T6	0	0	0	0	0	0	0	0	0	0	0	1