95 - Am - 241 9541 0 0 0 9.52410+ 4 2.389860+2 1 1 0 19541 1451 1 0.000000+0 0.000000+0 0 0 0 69541 1451 2 1.000000+0 0.000000+0 0 0 10 69541 1451 3 0.000000+0 0.000000+0 0 0 161 519541 1451 4 95-Am-241 MINSK BYEL EVAL-MAY96 9541 1451 5 DIST-MAY96 9541 1451 6 V.M. MASLOV, E.Sh. SUKHOVITSKIJ, 9541 1451 7 Yu.V. PORODZINSKIJ, A.B. KLEPATSKIJ, 9541 1451 8 G.B. MOROGOVSKIJ 9541 1451 9 STATUS 9541 1451 10 EVALUATION WAS MADE UNDER THE PROJECT AGREEMENT CIS-03-95 9541 1451 11 WITH INTERNATIONAL SCIENCE AND TECHNOLOGY CENTER (MOSCOW). 9541 1451 12 FINANCING PARTY OF THE CENTER FOR THE PROJECT IS JAPAN. 9541 1451 13 EVALUATION WAS REQUESTED BY Y.KIKUCHI (JAERI, TOKAI) 9541 1451 14 9541 1451 15 MF=1 GENERAL INFORMATION 9541 1451 16 9541 1451 17 MT=451 COMMENTS AND DICTIONARY 9541 1451 18 MT=452 TOTAL NUMBER OF NEUTRONS PER FISSION 9541 1451 19 SUM OF MT=455 AND MT=456. 9541 1451 20 MT=455 DELAYED NEUTRON DATA 9541 1451 21 NUMBER OF DELAYED NEUTRONS AND 9541 1451 22 DECAY CONSTANTS FROM BRADY ET AL./1 / 9541 1451 23 MT=456 NUMBER OF PROMPT NEUTRONS PER FISSION 9541 1451 24 MADLAND-NIX MODEL CALCULATIONS /2/ FITTED TO 9541 1451 25 THE EXPERIMENTAL ENERGY DEPENDENCE 3.078+0.146En 9541 1451 26 OF KHOKHLOV ET AL. /3/ BELOW 5.5 MEV. ABOVE 9541 1451 27 EMISSIVE FISSION THRESHOLD A SUPERPOSITION OF 9541 1451 28 NEUTRON EMISSION IN (N,XNF) REACTIONS /4/ AND PROMPT 9541 1451 29 FISSION NEUTRONS IS EMPLOYED. 9541 1451 30 9541 1451 31 MF=2 RESONANCE PARAMETERS 9541 1451 32 MT=151 RESONANCE PARAMETERS (MLBW) 9541 1451 33 RESOLVED RESONANCE REGION : 1.0E-5 - 150 EV 9541 1451 34 PARAMETERS FOR BREIT -WIGNER FORMULA ARE BASED ON 9541 1451 35 THE DATA OF ADAMCHUK ET AL. /5/, DERRIEN AND LUCAS /6/,9541 1451 36 BOWMAN ET AL. /7/, GERASIMOV /8/, DABBS ET AL. /9/, 9541 1451 37 WESTON AND TODD /10/ AND VANPRAET ET AL. /11/. 9541 1451 38 UNRESOLVED RESONANCE REGION : 0.15 - 41.3483 KEV. 9541 1451 39 ENERGY INDEPENDENT PARAMETERS: 9541 1451 40 R=9.157 FM FROM OPTICAL MODEL CALCULATIONS 9541 1451 41 S1=2.204E-4 FROM OPTICAL MODEL CALCULATIONS 9541 1451 42 S2=1.022E-4 FROM OPTICAL MODEL CALCULATIONS 9541 1451 43 ENERGY DEPENDENT PARAMETERS: 9541 1451 44 S0 - DECREASES FROM .864-4 (0.15KEV)TO .807-4 (41.4keV)9541 1451 45 D - SPIN DEPENDENT, NORMALIZED TO =0.505 EV 9541 1451 46 WITH ACCOUNT OF LEVEL MISSING /12/ 9541 1451 47 WF -SPIN DEPENDENT AS DEFINED BY THE TRANSITION STATE 9541 1451 48 SPECTRA AT INNER AND OUTER BARRIER HUMPS,NORMALIZED 9541 1451 49 TO =0.38 mEV TO FIT UNRESOLVED RESONANCE REGION9541 1451 50 EXPERIMENTAL FISSION DATA /9/. 9541 1451 51 WG - FROM CASCADE MODEL WITH ACCOUNT OF FISSION 9541 1451 52 COMPETITION,SPIN DEPENDENT. NORMALIZED TO = 9541 1451 53 0.0484 EV. 9541 1451 54 CALCULATED 2200 M/S CROSS SECTIONS AND RESONANCE 9541 1451 55 INTEGRALS. 9541 1451 56 2200 M/SEC RES.INTEG. 9541 1451 57 TOTAL 599.469 b - 9541 1451 58 ELASTIC 11.531 b - 9541 1451 59 FISSION 3.136 b 14.508 9541 1451 60 CAPTURE 584.802 b 1351.200 9541 1451 61 9541 1451 62 MF=3 NEUTRON CROSS SECTIONS 9541 1451 63 9541 1451 64 MT=1,4,51-60,91,102. TOTAL, ELASTIC AND INELASTIC 9541 1451 65 SCATTERING, CAPTURE CROSS SECTION 9541 1451 66 TOTAL,DIRECT ELASTIC AND DIRECT INELASTIC FOR MT=51, 9541 1451 67 52,53 AND OPTICAL TRANSMISSION COEFFICIENTS FROM 9541 1451 68 COUPLED CHANNELS CALCULATIONS. 9541 1451 69 THE DEFORMED OPTICAL POTENTIAL USED: 9541 1451 70 VR=46.15-0.3*E(MEV) RR=1.26 FM AR=0.615 FM 9541 1451 71 WD= 3.56+0.4*E(MEV) E < 10 MEV RD=1.24 FM 9541 1451 72 WD= 7.77 E => 10 MEV AD=0.5 FM 9541 1451 73 VSO=6.2 RSO=1.12 ASO=0.47 B2=0.181 B4=0.076 9541 1451 74 FOUR LOWER LEVELS OF GROUND STATE ROTATIONAL BAND 9541 1451 75 ARE COUPLED. 9541 1451 76 CAPTURE,COMPOUND ELASTIC AND INELASTIC BY STATISTICAL 9541 1451 77 MODEL, SEE MT=18-21 9541 1451 78 ABOVE NEUTRON ENERGY 5 MEV CAPTURE IS ASUMED TO BE 9541 1451 79 0.001 BARN AS PREDICTED BY DIRECT AND SEMI-DIRECT 9541 1451 80 CAPTURE CALCULATIONS 9541 1451 81 ADOPTED LEVEL SCHEME OF AM-241 FROM NUCLEAR DATA 9541 1451 82 SHEETS /13/ (9 LEVELS) PLUS 1 LEVEL ADDED FOR BAND 9541 1451 83 K,P=5/2+ ACCORDING TO EJ=A(J(J+1)-K(K+1)) 9541 1451 84 No ENERGY(MEV) SPIN-PARITY K 9541 1451 85 g.s. 0.0 5/2 - 5/2 9541 1451 86 1 0.041176 7/2 - 5/2 9541 1451 87 2 0.09365 9/2 - 5/2 9541 1451 88 3 0.158 11/2 - 5/2 9541 1451 89 4 0.20588 5/2 + 5/2 9541 1451 90 5 0.234 13/2 - 5/2 * 9541 1451 91 6 0.235 7/2 + 5/2 9541 1451 92 7 0.239 3/2 - 3/2 9541 1451 93 8 0.272 9/2 + 5/2 9541 1451 94 9 0.273 5/2 - 3/2 9541 1451 95 10 0.312 15/2 - 5/2 9541 1451 96 * - ADDED 9541 1451 97 9541 1451 98 OVERLAPPING LEVELS ARE ASSUMED ABOVE 0.312 MEV 9541 1451 99 LEVEL DENSITY PARAMETERS: SEE MT 18-21 9541 1451 100 MT=16,17. (N,2N) AND (N,3N) CROSS SECTION 9541 1451 101 FROM STATISTICAL MODEL CALCULATIONS /14/ WITH THE 9541 1451 102 ACCOUNT OF PRE-EQUILIBRIUM NEUTRON EMISSION:SEE MT=18-219541 1451 103 MT=18,19,20,21. FISSION CROSS SECTION IS CALCULATED WITHIN 9541 1451 104 STATISTICAL MODEL /15/, THE MEASURED DATA OF: 9541 1451 105 DABBS ET AL./9/, HAGE ET AL./16/, WISSHAK ET AL./17/, 9541 1451 106 KUPRIYANOV ET AL./18/, KNITTER ET AL. /19/, 9541 1451 107 PRINDLE ET AL./20/, FOMUSHKIN ET AL./21/ ARE FITTED. 9541 1451 108 THE FIRST CHANCE FISSION MT=19 IS CALCULATED WITH 9541 1451 109 THE CONTRIBUTION OF EMISSIVE FISSION TO TOTAL FISSION 9541 1451 110 CROSS SECTION IS CALCULATED ACCORDING TO /14,15/. 9541 1451 111 9541 1451 112 MF=4 ANGULAR DISTRIBUTIONS OF SECONDARY NEUTRONS 9541 1451 113 9541 1451 114 FOR MT=2,51,52,53 FROM COUPLED CHANNELS CALCULATIONS 9541 1451 115 WITH ADDED ISOTROPIC STATISTICAL CONTRIBUTION. 9541 1451 116 9541 1451 117 MT=16,17,18,52,54-60,91,16 ISOTROPIC 9541 1451 118 9541 1451 119 MF=5 ENERGY DISTRIBUTIONS OF SECONDARY NEUTRONS 9541 1451 120 9541 1451 121 ENERGY DISTRIBUTIONS FOR MT=16,17 WERE 9541 1451 122 CALCULATED BY STATISTICAL MODEL OF CASCADE NEUTRON 9541 1451 123 EMISSION TAKING INTO ACCOUNT THE HISTORY OF THE DECAY 9541 1451 124 WITH THE ALLOWANCE OF PRE-EQUILLIBRIUM EMISSION OF 9541 1451 125 THE FIRST NEUTRON /4/ 9541 1451 126 ENERGY DISTRIBUTIONS FOR MT=18,19,20,21 WERE 9541 1451 127 CALCULATED BY MADLAND-NIX MODEL /2/ WITH ACCOUNT FOR 9541 1451 128 THE EFFECTS OF AND COMPETITION BETWEEN MULTIPLE-CHANCE 9541 1451 129 FISSION PROCESSES UP THROUGH THIRD-CHANCE FISSION 9541 1451 130 WITH THE ALLOWANCE OF PRE-EQUILLIBRIUM EMISSION OF 9541 1451 131 THE FIRST NEUTRON /4/ 9541 1451 132 9541 1451 133 REFERENCES 9541 1451 134 9541 1451 135 1. 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Phys.5, 689, 1967 9541 1451 164 9541 1451 165 1 451 216 19541 1451 166 1 452 7 19541 1451 167 1 455 7 19541 1451 168 1 456 7 19541 1451 169 2 151 565 19541 1451 170 3 1 22 19541 1451 171 3 2 22 19541 1451 172 3 4 22 19541 1451 173 3 16 9 19541 1451 174 3 17 6 19541 1451 175 3 18 22 19541 1451 176 3 19 22 19541 1451 177 3 20 9 19541 1451 178 3 21 7 19541 1451 179 3 51 22 19541 1451 180 3 52 20 19541 1451 181 3 53 19 19541 1451 182 3 54 13 19541 1451 183 3 55 13 19541 1451 184 3 56 13 19541 1451 185 3 57 12 19541 1451 186 3 58 12 19541 1451 187 3 59 12 19541 1451 188 3 60 11 19541 1451 189 3 91 16 19541 1451 190 3 102 17 19541 1451 191 4 2 85 19541 1451 192 4 16 2 19541 1451 193 4 17 2 19541 1451 194 4 18 2 19541 1451 195 4 19 2 19541 1451 196 4 20 2 19541 1451 197 4 21 2 19541 1451 198 4 51 85 19541 1451 199 4 52 81 19541 1451 200 4 53 76 19541 1451 201 4 54 2 19541 1451 202 4 55 2 19541 1451 203 4 56 2 19541 1451 204 4 57 2 19541 1451 205 4 58 2 19541 1451 206 4 59 2 19541 1451 207 4 60 2 19541 1451 208 4 91 2 19541 1451 209 5 16 227 19541 1451 210 5 17 75 19541 1451 211 5 18 574 19541 1451 212 5 19 522 19541 1451 213 5 20 462 19541 1451 214 5 21 256 19541 1451 215 5 91 242 19541 1451 216 9541 1 0 217