Group parameters

232TH

Energy: Fast Spectrum

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).

#	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 ± 0.23 s

Correlation matrix

	a1	T1	a2	T2	a3	T3	a4	T4	a5	T5	a6	T6
a1	1
T1	0	1
a2	0	0.8	1
T2	0	0.62	0.23	1
a3	0	0.32	0.3	0.3	1
T3	0	0.32	-0.14	0.71	-0.31	1
a4	0	0.74	0.49	0.74	-0.02	0.68	1
T4	0	0.07	0.08	0.05	-0.64	0.23	0.05	1
a5	0	0.25	0.23	0.2	-0.04	0.1	-0.01	0.48	1
T5	0	0.04	0.03	0.03	-0.03	0.02	-0.22	0.25	0.1	1
a6	0	0.03	0.03	0.03	0	0.01	0.01	0.04	-0.05	0.04	1
T6	0	0.03	0.03	0.02	0	0.01	0.01	0.05	-0.04	0.01	-0.01	1

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	0.033 ± 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 ± 0.23 s

Correlation matrix

	a1	T1	a2	T2	a3	T3	a4	T4	a5	T5	a6	T6	a7	T7	a8	T8
a1	1
T1	0	1
a2	0	0	1
T2	0	0	0	1
a3	0	0	-0.74	0	1
T3	0	0	0	0	0	1
a4	0	0	0.51	0	-0.7	0	1
T4	0	0	0	0	0	0	0	1
a5	0	0	0.22	0	0.18	0	-0.59	0	1
T5	0	0	0	0	0	0	0	0	0	1
a6	0	0	0.09	0	-0.08	0	0.31	0	-0.57	0	1
T6	0	0	0	0	0	0	0	0	0	0	0	1
a7	0	0	0.07	0	-0.05	0	0.11	0	-0.06	0	-0.28	0	1
T7	0	0	0	0	0	0	0	0	0	0	0	0	0	1
a8	0	0	0.01	0	-0.01	0	0.01	0	0	0	-0.03	0	-0.04	0	1
T8	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	1

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	56.279 ± 0.411	0.039 ± 0.001
2	21.252 ± 0.197	0.149 ± 0.003
3	5.454 ± 0.082	0.161 ± 0.003
4	2.265 ± 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 : 7.41 ± 0.09 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

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.039 ± 0.001
2	24.5	0.078 ± 0.002
3	16.3	0.086 ± 0.001
4	5.21	0.136 ± 0.003
5	2.37	0.461 ± 0.003
6	1.04	0.094 ± 0.003
7	0.424	0.079 ± 0.004
8	0.195	0.028 ± 0.001

Average Half-life : 7.44 ± 0.08 s

Correlation matrix

	a1	T1	a2	T2	a3	T3	a4	T4	a5	T5	a6	T6	a7	T7	a8	T8
a1	1
T1	0	1
a2	0	0	1
T2	0	0	0	1
a3	0	0	-0.78	0	1
T3	0	0	0	0	0	1
a4	0	0	0.48	0	-0.7	0	1
T4	0	0	0	0	0	0	0	1
a5	0	0	0.28	0	0.12	0	-0.57	0	1
T5	0	0	0	0	0	0	0	0	0	1
a6	0	0	0.04	0	-0.06	0	0.25	0	-0.49	0	1
T6	0	0	0	0	0	0	0	0	0	0	0	1
a7	0	0	0.04	0	-0.04	0	0.11	0	-0.12	0	-0.15	0	1
T7	0	0	0	0	0	0	0	0	0	0	0	0	0	1
a8	0	0	0.01	0	-0.01	0	0.01	0	-0.01	0	-0.02	0	-0.03	0	1
T8	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	1

233U

Energy: Thermal Spectrum 6-groups

#	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 : 12.67 ± 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

8-Groups
Expanded Model using a fixed set of Half-lives
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	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 : 12.64 ± 0.24 s

Correlation matrix

	a1	T1	a2	T2	a3	T3	a4	T4	a5	T5	a6	T6	a7	T7	a8	T8
a1	1
T1	0	1
a2	0	0.48	1
T2	0	0.57	0.08	1
a3	0	0.4	-0.23	0.77	1
T3	0	-0.03	-0.63	-0.24	-0.16	1
a4	0	0.38	0.1	0.24	0.09	0.2	1
T4	0	0.14	-0.2	0.11	-0.25	0.54	-0.1	1
a5	0	0.56	0.22	0.46	0.2	0.08	-0.3	0.59	1
T5	0	-0.03	-0.03	-0.1	0	0.06	-0.57	-0.04	0.17	1
a6	0	0.06	0.03	0.05	0.03	0.01	-0.02	0.03	-0.07	0.16	1
T6	0	0.01	0	0.02	0	0.01	-0.01	0.06	-0.05	-0.05	0.01	1
a7	0	0.05	0.02	0.03	0.02	0	-0.01	0	-0.03	0.13	-0.02	0.03	1
T7	0	0.03	0.01	0.02	0.01	0	-0.01	0.01	-0.04	0.09	-0.01	0	0	1
a8	0	0.01	0	0.01	0	0	0	0	0	0.02	0	0.01	-0.01	0	1
T8	0	0.01	0	0.01	0	0	0	0	-0.01	0.03	0	0.01	-0.01	0	0	1

Energy: 0.59MeV

6-Groups
Original Model - Piksaikin V.M., Roshchenko V.A., Isaev S.G., et al., Cumulative Yields and Average Half-Life of Delayed Neutron Precursors From Neutron Induced Fission of U-233 Proc. of XII-th International Seminar on Interaction of Neutrons with Nuclei Neutron Spectroscopy, Nuclear Structure, Related Topics, Dubna, Russia, 24-28 May, 2004, pp.342-353.

#	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 ± 0.19 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 : 12.51 ± 0.24 s

Correlation matrix

	a1	T1	a2	T2	a3	T3	a4	T4	a5	T5	a6	T6	a7	T7	a8	T8
a1	1
T1	0	1
a2	0	0	1
T2	0	0	0	1
a3	0	0	-0.84	0	1
T3	0	0	0	0	0	1
a4	0	0	0.58	0	-0.76	0	1
T4	0	0	0	0	0	0	0	1
a5	0	0	-0.03	0	0.3	0	-0.73	0	1
T5	0	0	0	0	0	0	0	0	0	1
a6	0	0	0.01	0	-0.01	0	0.06	0	-0.18	0	1
T6	0	0	0	0	0	0	0	0	0	0	0	1
a7	0	0	0.03	0	-0.04	0	0.12	0	-0.25	0	-0.04	0	1
T7	0	0	0	0	0	0	0	0	0	0	0	0	0	1
a8	0	0	0	0	0	0	0.01	0	-0.01	0	0	0	-0.01	0	1
T8	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	1

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 ± 0.17 s

Correlation matrix

	a1	T1	a2	T2	a3	T3	a4	T4	a5	T5	a6	T6
a1	1
T1	0	1
a2	0	0.56	1
T2	0	0.73	-0.03	1
a3	0	0.36	0.17	0.36	1
T3	0	0.32	-0.45	0.66	-0.25	1
a4	0	0.48	0.02	0.56	-0.43	0.76	1
T4	0	-0.02	0.11	-0.07	-0.66	0.06	0.24	1
a5	0	0.07	0.05	0.06	-0.05	0.02	-0.11	0.28	1
T5	0	0.03	0	0.04	-0.02	0.05	-0.12	0.11	0.02	1
a6	0	0.02	0.02	0.01	-0.01	0	-0.01	0.06	-0.03	0.02	1
T6	0	0.02	0.01	0.01	-0.01	0	-0.02	0.06	-0.03	0	-0.01	1

#	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 ± 0.17 s

Correlation matrix

	a1	T1	a2	T2	a3	T3	a4	T4	a5	T5	a6	T6	a7	T7	a8	T8
a1	1
T1	0	1
a2	0	0	1
T2	0	0	0	1
a3	0	0	-0.85	0	1
T3	0	0	0	0	0	1
a4	0	0	0.53	0	-0.74	0	1
T4	0	0	0	0	0	0	0	1
a5	0	0	-0.04	0	0.31	0	-0.76	0	1
T5	0	0	0	0	0	0	0	0	0	1
a6	0	0	0.02	0	-0.04	0	0.15	0	-0.38	0	1
T6	0	0	0	0	0	0	0	0	0	0	0	1
a7	0	0	0.03	0	-0.04	0	0.12	0	-0.21	0	-0.09	0	1
T7	0	0	0	0	0	0	0	0	0	0	0	0	0	1
a8	0	0	0.01	0	-0.01	0	0.02	0	-0.03	0	-0.02	0	-0.03	0	1
T8	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	1

235U

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, p. 147, 2002. (in English)
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	53.9 ± 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

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.034 ± 0.001
2	24.5	0.153 ± 0.006
3	16.3	0.086 ± 0.004
4	5.21	0.212 ± 0.007
5	2.37	0.298 ± 0.009
6	1.04	0.105 ± 0.005
7	0.424	0.073 ± 0.004
8	0.195	0.039 ± 0.002

Average Half-life : 9.00 ± 0.18 s

Correlation matrix

	a1	T1	a2	T2	a3	T3	a4	T4	a5	T5	a6	T6	a7	T7	a8	T8
a1	1
T1	0	1
a2	0	0	1
T2	0	0	0	1
a3	0	0	-0.73	0	1
T3	0	0	0	0	0	1
a4	0	0	0.59	0	-0.74	0	1
T4	0	0	0	0	0	0	0	1
a5	0	0	0.18	0	0.21	0	-0.57	0	1
T5	0	0	0	0	0	0	0	0	0	1
a6	0	0	0.08	0	-0.08	0	0.25	0	-0.52	0	1
T6	0	0	0	0	0	0	0	0	0	0	0	1
a7	0	0	0.05	0	-0.05	0	0.1	0	-0.11	0	-0.15	0	1
T7	0	0	0	0	0	0	0	0	0	0	0	0	0	1
a8	0	0	0.01	0	-0.01	0	0.02	0	-0.02	0	-0.04	0	-0.04	0	1
T8	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	1

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.

#	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

Correlation matrix

	a1	T1	a2	T2	a3	T3	a4	T4	a5	T5	a6	T6	a7	T7	a8	T8
a1	1
T1	0	1
a2	0	0	1
T2	0	0	0	1
a3	0	0	-0.71	0	1
T3	0	0	0	0	0	1
a4	0	0	0.57	0	-0.74	0	1
T4	0	0	0	0	0	0	0	1
a5	0	0	0.25	0	0.19	0	-0.54	0	1
T5	0	0	0	0	0	0	0	0	0	1
a6	0	0	0.05	0	-0.05	0	0.18	0	-0.4	0	1
T6	0	0	0	0	0	0	0	0	0	0	0	1
a7	0	0	0.06	0	-0.06	0	0.15	0	-0.19	0	-0.14	0	1
T7	0	0	0	0	0	0	0	0	0	0	0	0	0	1
a8	0	0	0.01	0	-0.01	0	0.02	0	-0.01	0	-0.02	0	-0.04	0	1
T8	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	1

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 ± 0.15 s

Correlation matrix

	a1	T1	a2	T2	a3	T3	a4	T4	a5	T5	a6	T6
a1	1
T1	0	1
a2	0	0.78	1
T2	0	0.69	0.24	1
a3	0	0.34	0.25	0.34	1
T3	0	0.31	-0.2	0.68	-0.24	1
a4	0	0.63	0.36	0.66	-0.23	0.71	1
T4	0	-0.01	0.09	-0.07	-0.63	0	0.08	1
a5	0	0.16	0.14	0.13	-0.04	0.05	-0.11	0.39	1
T5	0	0.02	-0.01	0.04	-0.02	0.07	-0.18	0.1	0.07	1
a6	0	0.06	0.06	0.05	0	0.01	0	0.1	-0.07	0.08	1
T6	0	0.05	0.05	0.04	-0.01	0.01	-0.02	0.12	-0.06	0.04	-0.03	1

#	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 ± 0.15 s

Correlation matrix

	a1	T1	a2	T2	a3	T3	a4	T4	a5	T5	a6	T6	a7	T7	a8	T8
a1	1
T1	0	1
a2	0	0	1
T2	0	0	0	1
a3	0	0	-0.81	0	1
T3	0	0	0	0	0	1
a4	0	0	0.55	0	-0.74	0	1
T4	0	0	0	0	0	0	0	1
a5	0	0	0.1	0	0.23	0	-0.66	0	1
T5	0	0	0	0	0	0	0	0	0	1
a6	0	0	0.04	0	-0.06	0	0.2	0	-0.45	0	1
T6	0	0	0	0	0	0	0	0	0	0	0	1
a7	0	0	0.05	0	-0.05	0	0.14	0	-0.19	0	-0.14	0	1
T7	0	0	0	0	0	0	0	0	0	0	0	0	0	1
a8	0	0	0.01	0	-0.01	0	0.03	0	-0.03	0	-0.03	0	-0.06	0	1
T8	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	1

238U

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	1.00
T1	0.00	1.00
a2	0.00	0.77	1.00
T2	0.00	0.02	0.09	1.00
a3	0.00	0.26	0.36	0.19	1.00
T3	0.00	0.06	-0.06	0.65	-0.40	1.00
a4	0.00	0.53	0.63	0.50	0.00	0.57	1.00
T4	0.00	0.09	0.13	0.02	-0.58	0.17	0.00	1.00
a5	0.00	0.24	0.30	0.15	0.02	0.09	0.02	0.42	1.00
T5	0.00	0.09	0.12	0.08	-0.01	0.06	-0.17	0.28	0.03	1.00
a6	0.00	0.03	0.04	0.02	0.00	0.01	0.02	0.04	-0.04	0.03	1.00
T6	0.00	0.04	0.05	0.03	0.00	0.01	0.02	0.06	-0.05	0.02	-0.01	1.00

#	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

Correlation matrix

	a1	T1	a2	T2	a3	T3	a4	T4	a5	T5	a6	T6	a7	T7	a8	T8
a1	1.00
T1	0.00	1.00
a2	0.00	0.00	1.00
T2	0.00	0.00	0.00	1.00
a3	0.00	0.00	-0.43	0.00	1.00
T3	0.00	0.00	0.00	0.00	0.00	1.00
a4	0.00	0.00	0.56	0.00	-0.61	0.00	1.00
T4	0.00	0.00	0.00	0.00	0.00	0.00	0.00	1.00
a5	0.00	0.00	0.53	0.00	0.18	0.00	-0.27	0.00	1.00
T5	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	1.00
a6	0.00	0.00	0.22	0.00	-0.07	0.00	0.37	0.00	-0.36	0.00	1.00
T6	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	1.00
a7	0.00	0.00	0.20	0.00	-0.05	0.00	0.17	0.00	0.09	0.00	-0.32	0.00	1.00
T7	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	1.00
a8	0.00	0.00	0.05	0.00	-0.01	0.00	0.03	0.00	0.05	0.00	-0.06	0.00	-0.12	0.00	1.00
T8	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	1.00

Energy: 14.23 MeV

6-Groups
Original Model - V.M. Piksaikin, V.A. Roshchenko, G.G. Korolev, Relative yield of delayed neutrons and half-life of their precursor nuclei from 238U fission by 14.2-17.9 MeV neutrons,” At. Energy 102, 124 (2007).

#	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 : 5.95 ± 0.08 s

Correlation matrix

	a1	T1	a2	T2	a3	T3	a4	T4	a5	T5	a6	T6
a1	1.00
T1	0.00	1.00
a2	0.00	0.66	1.00
T2	0.00	0.01	-0.09	1.00
a3	0.00	0.21	0.20	0.31	1.00
T3	0.00	0.04	-0.25	0.55	-0.15	1.00
a4	0.00	0.46	0.51	0.42	-0.04	0.40	1.00
T4	0.00	0.11	0.18	0.11	-0.35	-0.12	-0.01	1.00
a5	0.00	0.10	0.11	0.09	0.02	0.05	-0.05	0.18	1.00
T5	0.00	0.07	0.07	0.06	0.01	0.06	-0.08	0.09	-0.01	1.00
a6	0.00	0.01	0.01	0.01	0.00	0.00	0.00	0.02	-0.01	0.00	1.00
T6	0.00	0.01	0.02	0.01	0.00	0.01	0.00	0.03	-0.01	0.00	0.00	1.00

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.
V.M.Piksaikin et al. Generation of correlation and covariance matrices for the recommended Temporal DN parameters in 6- and 8- group models, EPJ Nuclear Sci. Technol., 6, 54,2020

#	Half-life [s]	Relative abundance a(i)
1	55.6	0.0183 ± 4.70E-04
2	24.5	0.08475 ± 0.00218
3	16.3	0.06922 ± 0.00144
4	5.21	0.11161 ± 0.00292
5	2.37	0.38513 ± 0.00422
6	1.04	0.15423 ± 0.0046
7	0.424	0.11152 ± 0.00655
8	0.195	0.06524 ± 0.00442

Average Half-life : 5.94 ± 0.07 s

Correlation matrix

	a1	T1	a2	T2	a3	T3	a4	T4	a5	T5	a6	T6	a7	T7	a8	T8
a1	1
T1	0	1
a2	0	0	1
T2	0	0	0	1
a3	0	0	-0.61	0	1
T3	0	0	0	0	0	1
a4	0	0	0.49	0	-0.67	0	1
T4	0	0	0	0	0	0	0	1
a5	0	0	0.43	0	0.11	0	-0.44	0	1
T5	0	0	0	0	0	0	0	0	0	1
a6	0	0	0.14	0	-0.09	0	0.35	0	-0.49	0	1
T6	0	0	0	0	0	0	0	0	0	0	0	1
a7	0	0	0.09	0	-0.05	0	0.1	0	0.01	0	-0.29	0	1
T7	0	0	0	0	0	0	0	0	0	0	0	0	0	1
a8	0	0	0.03	0	-0.01	0	0.02	0	0.02	0	-0.07	0	-0.08	0	1
T8	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	1

239PU

Energy: Thermal spectrum

#	Half-life [s]	Relative abundance a(i)
1	53.198 ± 0.464	0.035 ± 0.001
2	22.609 ± 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
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;

#	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

Correlation matrix

	a1	T1	a2	T2	a3	T3	a4	T4	a5	T5	a6	T6	a7	T7	a8	T8
a1	1.00
T1	0.00	1.00
a2	0.00	0.00	1.00
T2	0.00	0.00	0.00	1.00
a3	0.00	0.00	-0.67	0.00	1.00
T3	0.00	0.00	0.00	0.00	0.00	1.00
a4	0.00	0.00	0.54	0.00	-0.72	0.00	1.00
T4	0.00	0.00	0.00	0.00	0.00	0.00	0.00	1.00
a5	0.00	0.00	0.26	0.00	0.17	0.00	-0.55	0.00	1.00
T5	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	1.00
a6	0.00	0.00	0.06	0.00	-0.05	0.00	0.20	0.00	-0.45	0.00	1.00
T6	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	1.00
a7	0.00	0.00	0.05	0.00	-0.04	0.00	0.11	0.00	-0.14	0.00	-0.14	0.00	1.00
T7	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	1.00
a8	0.00	0.00	0.01	0.00	-0.01	0.00	0.01	0.00	-0.01	0.00	-0.02	0.00	-0.02	0.00	1.00
T8	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	1.00

Energy: 0.86MeV

6-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;
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 0.37 to 4.97 MeV, Atomic Energy 92, 2002, No.3, pp.233-239;

#	Half-life [s]	Relative abundance a(i)
1	53.81 ± 0.408	0.037 ± 0.001
2	22.19 ± 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	1.00
T1	0.00	1.00
a2	0.00	0.88	1.00
T2	0.00	0.18	0.32	1.00
a3	0.00	0.17	0.19	0.26	1.00
T3	0.00	0.01	-0.04	0.63	-0.10	1.00
a4	0.00	0.57	0.65	0.43	-0.04	0.32	1.00
T4	0.00	0.08	0.13	0.08	-0.42	-0.22	-0.22	1.00
a5	0.00	0.43	0.50	0.33	0.02	0.07	-0.07	0.59	1.00
T5	0.00	0.01	0.00	0.05	-0.02	0.15	-0.38	0.07	0.21	1.00
a6	0.00	0.08	0.09	0.05	0.01	0.01	0.01	0.07	-0.06	0.14	1.00
T6	0.00	0.04	0.05	0.03	0.00	0.00	0.00	0.08	-0.04	0.00	0.01	1.00

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

Correlation matrix

	a1	T1	a2	T2	a3	T3	a4	T4	a5	T5	a6	T6	a7	T7	a8	T8
a1	1.00
T1	0.00	1.00
a2	0.00	0.00	1.00
T2	0.00	0.00	0.00	1.00
a3	0.00	0.00	-0.67	0.00	1.00
T3	0.00	0.00	0.00	0.00	0.00	1.00
a4	0.00	0.00	0.54	0.00	-0.72	0.00	1.00
T4	0.00	0.00	0.00	0.00	0.00	0.00	0.00	1.00
a5	0.00	0.00	0.26	0.00	0.17	0.00	-0.55	0.00	1.00
T5	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	1.00
a6	0.00	0.00	0.06	0.00	-0.05	0.00	0.20	0.00	-0.45	0.00	1.00
T6	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	1.00
a7	0.00	0.00	0.05	0.00	-0.04	0.00	0.11	0.00	-0.14	0.00	-0.14	0.00	1.00
T7	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	1.00
a8	0.00	0.00	0.01	0.00	-0.01	0.00	0.01	0.00	-0.01	0.00	-0.02	0.00	-0.02	0.00	1.00
T8	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	1.00

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. N. 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 : 8.90 ± 0.12 s

Correlation matrix

	a1	T1	a2	T2	a3	T3	a4	T4	a5	T5	a6	T6
a1	1.00
T1	0.00	1.00
a2	0.00	0.88	1.00
T2	0.00	0.18	0.32	1.00
a3	0.00	0.17	0.19	0.26	1.00
T3	0.00	0.01	-0.04	0.63	-0.10	1.00
a4	0.00	0.57	0.65	0.43	-0.04	0.32	1.00
T4	0.00	0.08	0.13	0.08	-0.42	-0.22	-0.22	1.00
a5	0.00	0.43	0.50	0.33	0.02	0.07	-0.07	0.59	1.00
T5	0.00	0.01	0.00	0.05	-0.02	0.15	-0.38	0.07	0.21	1.00
a6	0.00	0.08	0.09	0.05	0.01	0.01	0.01	0.07	-0.06	0.14	1.00
T6	0.00	0.04	0.05	0.03	0.00	0.00	0.00	0.08	-0.04	0.00	0.01	1.00

8-Groups
Expanded Model using a fixed set of Half-lives
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. Generation of correlation and covariance matrices for the recommended Temporal DN parameters in 6- and 8- group models, EPJ Nuclear Sci. Technol., 6, 54,2020

#	Half-life [s]	Relative abundance a(i)
1	55.6000	0.0530 ± 0.0026
2	24.5000	0.1024 ± 0.0050
3	16.3000	0.0932 ± 0.0043
4	5.2100	0.1769 ± 0.0086
5	2.3700	0.3812 ± 0.0114
6	1.0400	0.0876 ± 0.0059
7	0.4240	0.0829 ± 0.0057
8	0.1950	0.0229 ± 0.0016

Average Half-life : 8.92 ± 0.21

Correlation matrix

	a1	T1	a2	T2	a3	T3	a4	T4	a5	T5	a6	T6	a7	T7	a8	T8
a1	1.00
T1	0.00	1.00
a2	0.00	0.00	1.00
T2	0.00	0.00	0.00	1.00
a3	0.00	0.00	-0.81	0.00	1.00
T3	0.00	0.00	0.00	0.00	0.00	1.00
a4	0.00	0.00	0.52	0.00	-0.73	0.00	1.00
T4	0.00	0.00	0.00	0.00	0.00	0.00	0.00	1.00
a5	0.00	0.00	0.12	0.00	0.21	0.00	-0.66	0.00	1.00
T5	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	1.00
a6	0.00	0.00	0.06	0.00	-0.07	0.00	0.25	0.00	-0.54	0.00	1.00
T6	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	1.00
a7	0.00	0.00	0.05	0.00	-0.05	0.00	0.13	0.00	-0.15	0.00	-0.18	0.00	1.00
T7	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	1.00
a8	0.00	0.00	0.01	0.00	-0.01	0.00	0.01	0.00	-0.01	0.00	-0.02	0.00	-0.03	0.00	1.00
T8	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	1.00

241PU

Energy: Thermal Spectrum

5-Groups
Original Model - S. A. COX, Delayed-Neutron Studies from the Thermal-Neutron-Induced Fission of 241Pu,” Physical Review, 123, No. 5, 1735 (September 1, 1961).

#	Half-life [s]	Relative abundance a(i)
1	54 ± 1.000	0.010 ± 0.003
2	23.2 ± 0.500	0.233 ± 0.006
3	5.6 ± 0.600	0.176 ± 0.026
4	1.97 ± 0.100	0.396 ± 0.051
5	0.43 ± 0.040	0.185 ± 0.019

Average Half-life : 7.77 ± 0.32 s

Correlation matrix

	a1	T1	a2	T2	a3	T3	a4	T4	a5	T5
a1	1
T1	0	1
a2	-0.46	0	1
T2	-0.15	0	0.76	1
a3	0.18	0	-0.09	0.22	1
T3	-0.04	0	0.31	0.46	0.16	1
a4	0.08	0	-0.02	0.07	0.66	-0.46	1
T4	-0.06	0	0.53	0.76	0.5	0.06	0.57	1
a5	-0.01	0	0.07	0.1	0.05	-0.62	0.33	0.11	1
T5	-0.03	0	0.23	0.32	0.12	0.01	0.09	0.09	0.43	1

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	0.011 ± 0.003
2	24.5	0.166 ± 0.003
3	16.3	0.095 ± 0.011
4	5.21	0.100 ± 0.025
5	2.37	0.382 ± 0.043
6	1.04	0.073 ± 0.030
7	0.424	0.174 ± 0.012

Average Half-life : 7.78 ± 0.32 s

Correlation matrix

	a1	T1	a2	T2	a3	T3	a4	T4	a5	T5	a6	T6	a7	T7
a1	1
T1	0	1
a2	0	0	1
T2	0	0	0	1
a3	0	0	-0.18	0	1
T3	0	0	0	0	0	1
a4	0	0	0.53	0	-0.53	0	1
T4	0	0	0	0	0	0	0	1
a5	0	0	0.73	0	0.23	0	-0.1	0	1
T5	0	0	0	0	0	0	0	0	0	1
a6	0	0	0.07	0	-0.01	0	0.15	0	-0.17	0	1
T6	0	0	0	0	0	0	0	0	0	0	0	1
a7	0	0	0.24	0	-0.03	0	0.29	0	-0.03	0	-0.18	0	1
T7	0	0	0	0	0	0	0	0	0	0	0	0	0	1

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	55.9 ± 0.000	0.017 ± 0.003
2	23.0 ± 0.000	0.218 ± 0.022
3	5.64 ± 0.000	0.179 ± 0.019
4	2.10 ± 0.000	0.362 ± 0.040
5	0.578 ± 0.000	0.189 ± 0.042
6	0.201 ± 0.000	0.035 ± 0.014

Average Half-life : 7.85 ± 0.54 s

Correlation matrix

	a1	T1	a2	T2	a3	T3	a4	T4	a5	T5	a6	T6
a1	1
T1	0	1
a2	0	0	1
T2	0	0	0	1
a3	0	0	0.12	0	1
T3	0	0	0	0	0	1
a4	0	0	0.68	0	-0.46	0	1
T4	0	0	0	0	0	0	0	1
a5	0	0	0.08	0	0.36	0	-0.43	0	1
T5	0	0	0	0	0	0	0	0	0	1
a6	0	0	0.01	0	0.01	0	0	0	-0.08	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	0.016 ± 0.002
2	24.5	0.175 ± 0.019
3	16.3	0.055 ± 0.012
4	5.21	0.170 ± 0.018
5	2.37	0.280 ± 0.035
6	1.04	0.166 ± 0.033
7	0.424	0.113 ± 0.035
8	0.195	0.024 ± 0.006

Average Half-life : 7.85 ± 0.53 s

Correlation matrix

	a1	T1	a2	T2	a3	T3	a4	T4	a5	T5	a6	T6	a7	T7	a8	T8
a1	1
T1	0	1
a2	0	0	1
T2	0	0	0	1
a3	0	0	-0.53	0	1
T3	0	0	0	0	0	1
a4	0	0	0.57	0	-0.66	0	1
T4	0	0	0	0	0	0	0	1
a5	0	0	0.38	0	0.14	0	-0.41	0	1
T5	0	0	0	0	0	0	0	0	0	1
a6	0	0	0.21	0	-0.1	0	0.36	0	-0.49	0	1
T6	0	0	0	0	0	0	0	0	0	0	0	1
a7	0	0	0.11	0	-0.06	0	0.12	0	0	0	-0.29	0	1
T7	0	0	0	0	0	0	0	0	0	0	0	0	0	1
a8	0	0	0.01	0	-0.01	0	0.01	0	0.01	0	-0.03	0	-0.03	0	1
T8	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	1