93 - Np - 238 9349 0 0 0 9.323800+4 2.360060+2 1 1 0 19349 1451 1 0.000000+0 1.000000+0 0 0 0 69349 1451 2 1.000000+0 0.000000+0 0 0 10 69349 1451 3 0.000000+0 0.000000+0 0 0 169 639349 1451 4 93-NP-238 MINSK BYEL EVAL-NOV97 9349 1451 5 DIST-NOV97 9349 1451 6 9349 1451 7 V.M. MASLOV, Yu.V. PORODZINSKIJ, 9349 1451 8 E.Sh. SUKHOVITSKIJ 9349 1451 9 9349 1451 10 STATUS 9349 1451 11 EVALUATION WAS MADE UNDER THE PROJECT AGREEMENT CIS-03-95 9349 1451 12 WITH INTERNATIONAL SCIENCE AND TECHNOLOGY CENTER (MOSCOW). 9349 1451 13 FINANCING PARTY OF THE ISTC FOR THE PROJECT IS JAPAN. 9349 1451 14 EVALUATION WAS REQUESTED BY JAPAN NUCLEAR DATA CENTER (JAERI). 9349 1451 15 DOCUMENTED IN INDC(BLR)-011, 1998. 9349 1451 16 9349 1451 17 MF=1 GENERAL INFORMATION 9349 1451 18 9349 1451 19 MT=451 COMMENTS AND DICTIONARY 9349 1451 20 MT=452 TOTAL NUMBER OF NEUTRONS PER FISSION 9349 1451 21 SUM OF MT=455 AND MT=456. 9349 1451 22 MT=455 DELAYED NEUTRON DATA 9349 1451 23 NUMBER OF DELAYED NEUTRONS AND 9349 1451 24 DECAY CONSTANTS FROM TUTTLE/1/ AND BRADY ET AL./2/. 9349 1451 25 MT=456 NUMBER OF PROMPT NEUTRONS PER FISSION 9349 1451 26 ABOVE EMISSIVE FISSION THRESHOLD IS A 9349 1451 27 SUPERPOSITION OF NEUTRON EMISSION 9349 1451 28 IN (N,XNF) REACTIONS AND PROMPT FISSION 9349 1451 29 NEUTRONS. 9349 1451 30 9349 1451 31 MF=2 RESONANCE PARAMETERS 9349 1451 32 9349 1451 33 MT=151 RESONANCE PARAMETERS (MLBW) 9349 1451 34 RESOLVED RESONANCE REGION : 1.0E-5 - 100 EV 9349 1451 35 PARAMETERS OF BREIT-WIGNER FORMULA ARE BASED UPON 9349 1451 36 THE REFERENCES /3-7/; 9349 1451 37 9349 1451 38 CALCULATED 2200 M/S CROSS SECTIONS AND RESONANCE 9349 1451 39 INTEGRALS ARE: 9349 1451 40 2200 M/SEC RES.INTEG. 9349 1451 41 TOTAL 2415.140 b - 9349 1451 42 ELASTIC 95.100 b - 9349 1451 43 FISSION 2062.820 b 925.338 9349 1451 44 CAPTURE 257.214 b 112.288 9349 1451 45 9349 1451 46 UNRESOLVED RESONANCE REGION : 0.1 - 26.5420 9349 1451 47 ENERGY INDEPENDENT PARAMETERS: 9349 1451 48 R=9.226 FM FROM OPTICAL MODEL CALCULATIONS 9349 1451 49 S1=1.88 *10-4 FROM 0PTICAL MODEL CALCULATIONS 9349 1451 50 S2=1.334*10-4 FROM OPTICAL MODEL CALCULATIONS 9349 1451 51 ENERGY DEPENDENT PARAMETERS: 9349 1451 52 S0-DECREASES FROM 1.047-4(100 EV) TO 0.996-4(26.54KEV) 9349 1451 53 D - SPIN DEPENDENT, NORMALIZED TO =0.607 EV 9349 1451 54 OBTAINED USING ACTINIDE LEVEL DENSITY PARAMETER SYS- 9349 1451 55 TEMATICS /8/. 9349 1451 56 WF -SPIN DEPENDENT AS DEFINED BY THE TRANSITION STATE 9349 1451 57 SPECTRA AT INNER AND OUTER BARRIER HUMPS, CALCULATED 9349 1451 58 USING FISSION BARRIER PARAMETERS, FITTED TO SIMULATED 9349 1451 59 FISSION DATA BY BRITT ET AL./9/. 9349 1451 60 WG - FROM CASCADE MODEL WITH ACCOUNT OF FISSION AND 9349 1451 61 NEUTRON EMISSION COMPETITION, SPIN DEPENDENT. NORMA- 9349 1451 62 LIZED TO = 0.050 EV. 9349 1451 63 9349 1451 64 MF=3 NEUTRON CROSS SECTIONS 9349 1451 65 9349 1451 66 MT=1,4,51-66,91,102. TOTAL, ELASTIC AND INELASTIC 9349 1451 67 SCATTERING, CAPTURE CROSS SECTION 9349 1451 68 TOTAL,DIRECT ELASTIC AND DIRECT INELASTIC FOR MT=51, 9349 1451 69 52,54 AND OPTICAL TRANSMISSION COEFFICIENTS FROM 9349 1451 70 COUPLED CHANNEL CALCULATIONS. 9349 1451 71 THE DEFORMED OPTICAL POTENTIAL USED: ENERGY DEPENDENCE 9349 1451 72 OF VR AND WD DEFINED BY SYSTEMATICS. 9349 1451 73 VR=(46.31-0.30*E) MEV RR=1.26 FM AR=0.615 FM 9349 1451 74 WD=(3.66+0.40*E) MEV E < 10 MEV RD=1.24 FM 9349 1451 75 WD= 7.66 MEV E=> 10 MEV AD=0.5 FM 9349 1451 76 VSO=6.2 MEV RSO=1.12 FM ASO=0.47 FM B2=0.200 B4=0.087 9349 1451 77 FOUR LEVELS OF ROTATIONAL GROUND STATE BAND 9349 1451 78 ARE COUPLED. 9349 1451 79 CAPTURE,COMPOUND ELASTIC AND INELASTIC BY STATISTICAL 9349 1451 80 MODEL, SEE MT=18-21 9349 1451 81 ABOVE NEUTRON ENERGY 5 MEV CAPTURE IS ASSUMED TO BE 9349 1451 82 CONSTANT. 9349 1451 83 ADOPTED LEVEL SCHEME OF NP-238 FROM NUCLEAR DATA 9349 1451 84 SHEETS /10/, SUPPLEMENTED BY SOOD ET AL./11/. 9349 1451 85 9349 1451 86 No ENERGY(MEV) SPIN-PARITY K 9349 1451 87 9349 1451 88 g.s. 0.0 2 + 2 9349 1451 89 1 0.02643 3 + 2 9349 1451 90 2 0.06222 4 + 2 9349 1451 91 3 0.08665 3 + 3 9349 1451 92 4 0.10626 5 + 2 9349 1451 93 5 0.12176 4 + 3 9349 1451 94 6 0.13601 3 - 3 9349 1451 95 7* 0.15000 1 + 1 9349 1451 96 8 0.16577 5 + 3 9349 1451 97 9* 0.16760 2 + 1 9349 1451 98 10 0.17915 4 - 3 9349 1451 99 11 0.18286 2 - 2 9349 1451 100 12* 0.19400 3 + 1 9349 1451 101 13 0.21548 3 - 2 9349 1451 102 14 0.22120 6 + 3 9349 1451 103 15 0.22920 4 + 1 9349 1451 104 16 0.23280 5 - 3 9349 1451 105 *) ADDED FROM CALCULATED SCHEME BY SOOD /11/. 9349 1451 106 9349 1451 107 OVERLAPPING LEVELS ARE ASSUMED ABOVE 0.2329 MEV 9349 1451 108 LEVEL DENSITY PARAMETERS: SEE MT 18-21 9349 1451 109 MT=16,17, (N,2N) AND (N,3N) CROSS SECTION 9349 1451 110 FROM STATISTICAL MODEL CALCULATIONS /12/ WITH THE 9349 1451 111 ACCOUNT OF PRE-EQUILIBRIUM NEUTRON EMISSION:SEE MT=18-219349 1451 112 MT=18,19,20,21. FISSION CROSS SECTION IS CALCULATED WITHIN 9349 1451 113 STATISTICAL MODEL /12,13,14,15/. SIMULATED NEUTRON 9349 1451 114 INDUCED FISSION DATA BY BRITT AND WILHELMY /9/ ARE 9349 1451 115 DESCRIBED. 9349 1451 116 THE FIRST CHANCE FISSION MT=19 IS CALCULATED WITH 9349 1451 117 THE CONTRIBUTION OF EMISSIVE FISSION TO TOTAL FISSION 9349 1451 118 CROSS SECTION ACCORDING TO /13/. 9349 1451 119 9349 1451 120 MF=4 ANGULAR DISTRIBUTIONS OF SECONDARY NEUTRONS 9349 1451 121 9349 1451 122 FOR MT=2,51,52,54 FROM COUPLED CHANNELS CALCULATIONS 9349 1451 123 WITH ADDED ISOTROPIC STATISTICAL CONTRIBUTION. 9349 1451 124 9349 1451 125 MT=16,17,18-21,53,55-66,91 - ISOTROPIC 9349 1451 126 9349 1451 127 MF=5 ENERGY DISTRIBUTIONS OF SECONDARY NEUTRONS 9349 1451 128 9349 1451 129 ENERGY DISTRIBUTIONS FOR MT=16,17 WERE 9349 1451 130 CALCULATED BY STATISTICAL MODEL OF CASCADE NEUTRON 9349 1451 131 EMISSION TAKING INTO ACCOUNT THE HISTORY OF THE DECAY 9349 1451 132 WITH THE ALLOWANCE OF PRE-EQUILLIBRIUM EMISSION OF 9349 1451 133 THE FIRST NEUTRON /16/ 9349 1451 134 ENERGY DISTRIBUTIONS FOR MT=18,19,20,21 WERE CALCULATED 9349 1451 135 WITH ACCOUNT OF COMPETITION 9349 1451 136 BETWEEN MULTIPLE-CHANCE FISSION PROCESSES UP THROUGH 9349 1451 137 THIRD-CHANCE FISSION WITH THE ALLOWANCE OF PRE-EQUILIBRIUM9349 1451 138 EMISSION OF THE FIRST NEUTRON /16/. 9349 1451 139 9349 1451 140 REFERENCES 9349 1451 141 1. Tuttle R.J. INDS(NDS)-107/G, p.29. 9349 1451 142 2. Brady M.C., Wright R.Q., England T.R., Report ORNL/CSD/TM- 9349 1451 143 226 (1991), IAEA-NDS-102, 1992 9349 1451 144 3. Spencer J.D.,Bauman N.P. Trans. Am. Nucl. Soc.,12, 284 (1969)9349 1451 145 4. S.Abramovich, M.Andreev, Yu.Bolshakov et al., Proc. of the 9349 1451 146 XIII Meeting on Physics of Nuclear Fission in the Memory of 9349 1451 147 Prof. G.N. Smirenkin, Obninsk, October 3-6, 1995, p.303. 9349 1451 148 5. S.Abramovich, M.Andreev, Yu.Bolshakov et al., Accelerator 9349 1451 149 Driven Transmutation Technologies and Applications, Proc. 9349 1451 150 of the Int. Conf.,Las Vegas, Nevada, USA, July, 1994, p.303. 9349 1451 151 6. Danon Y., Moore M.S., Koehler P.E. et al. Nucl. Sci. Eng. 9349 1451 152 124, 482 (1996). 9349 1451 153 7. Moore M.S., Koehler P.E.,Littleton P.E. et al. Nuclear Data 9349 1451 154 for Sci. and Tech.,Proc. Int. Conf., Gattlinburg, Tennessee, 9349 1451 155 USA, May 9-13, 1994, v.2, p. 1075. 9349 1451 156 8. Maslov V.M. Porodzinskij Yu.V., Sukhovitskij E.Sh.Int.Conf. 9349 1451 157 Nuclear Data for Science And Technology, Trieste, Italy, 9349 1451 158 May 19-24, 1997, to be published. 9349 1451 159 9. Britt H.C., Wilhelmy Nucl. Sci. Eng. 72, 222 (1979). 9349 1451 160 10. ENSDF,1995 9349 1451 161 11. Sood P.C., Singh R.N. Nucl. Phys. A373, 519 (1982). 9349 1451 162 12. Ignatjuk A.V., Maslov V.M., Pashchenko A.B. Sov.J.Nucl.Phys. 9349 1451 163 47, 224 (1988). 9349 1451 164 13. Ignatjuk A.V., Maslov V.M., Proc.Int.Symp.Nuclear Data 9349 1451 165 Evaluation Methodology, Brookhaven, USA, October 12-16, 9349 1451 166 p.440, World Scientific, 1993. 9349 1451 167 14. Maslov V.M., Kikuchi Y. JAERI-Research 96-030, June, 1996. 9349 1451 168 15. Maslov V.M. Int.Conf.Nuclear Data for Science And Technology,9349 1451 169 Trieste, Italy, May 19-24, 1997, to be published. 9349 1451 170 16. Maslov V.M.,Porodzinskij Yu.V.,Sukhovitskij E.Sh., Proc. 9349 1451 171 Int. Conf.on Neutron Physics, Kiev, USSR, v.1,p.413 (1988) 9349 1451 172 9349 1451 173 1 451 236 09349 1451 174 1 452 5 09349 1451 175 1 455 7 09349 1451 176 1 456 5 09349 1451 177 2 151 288 09349 1451 178 3 1 26 09349 1451 179 3 2 26 09349 1451 180 3 4 25 09349 1451 181 3 16 10 09349 1451 182 3 17 6 09349 1451 183 3 18 26 09349 1451 184 3 19 26 09349 1451 185 3 20 11 09349 1451 186 3 21 7 09349 1451 187 3 51 25 09349 1451 188 3 52 23 09349 1451 189 3 53 15 09349 1451 190 3 54 21 09349 1451 191 3 55 14 09349 1451 192 3 56 14 09349 1451 193 3 57 13 09349 1451 194 3 58 13 09349 1451 195 3 59 13 09349 1451 196 3 60 12 09349 1451 197 3 61 12 09349 1451 198 3 62 12 09349 1451 199 3 63 11 09349 1451 200 3 64 11 09349 1451 201 3 65 11 09349 1451 202 3 66 10 09349 1451 203 3 91 17 09349 1451 204 3 102 19 09349 1451 205 4 2 90 09349 1451 206 4 16 2 09349 1451 207 4 17 2 09349 1451 208 4 18 2 09349 1451 209 4 19 2 09349 1451 210 4 20 2 09349 1451 211 4 21 2 09349 1451 212 4 51 90 09349 1451 213 4 52 87 09349 1451 214 4 53 2 09349 1451 215 4 54 84 09349 1451 216 4 55 2 09349 1451 217 4 56 2 09349 1451 218 4 57 2 09349 1451 219 4 58 2 09349 1451 220 4 59 2 09349 1451 221 4 60 2 09349 1451 222 4 61 2 09349 1451 223 4 62 2 09349 1451 224 4 63 2 09349 1451 225 4 64 2 09349 1451 226 4 65 2 09349 1451 227 4 66 2 09349 1451 228 4 91 2 09349 1451 229 5 16 585 09349 1451 230 5 17 309 09349 1451 231 5 18 759 09349 1451 232 5 19 296 09349 1451 233 5 20 234 09349 1451 234 5 21 130 09349 1451 235 5 91 1703 09349 1451 236 9349 1 0 237