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51 // Copyright (c) 2006 The Regents of the University of California.
52 // All rights reserved.
53 // UCRL-CODE-224807
54 //
55 //
56 //
57
58 #include <cmath>
59 #include "G4fissionEvent.hh"
60
61 G4int G4fissionEvent::G4SmpNuDistDataU233_235_MC(G4double nubar) {
62
63 /*
64 Description
65 Sample Number of Neutrons from fission in U-233 and U-235 using
66 Zucker and Holden's tabulated data for U-235
67 The 11 P(nu) distributions are given as a function of nubar,
68 the average number of neutrons from induced fission for the
69 11 different energies (0 to 10 MeV), based on the U-235 data
70 from Zucker and Holden.
71 */
72
73 /*
74 Input
75 nubar - average number of neutrons per fission
76 Output
77 G4SmpNuDistDataU233_235_MC - sampled multiplicity
78
79 */
80
81 static G4double U235nu [11] [8] = {
82 {.0317223, .1717071, .3361991, .3039695, .1269459, .0266793, .0026322, .0001449},
83 {.0237898, .1555525, .3216515, .3150433, .1444732, .0356013, .0034339, .0004546},
84 {.0183989, .1384891, .3062123, .3217566, .1628673, .0455972, .0055694, .0011093},
85 {.0141460, .1194839, .2883075, .3266568, .1836014, .0569113, .0089426, .0019504},
86 {.0115208, .1032624, .2716849, .3283426, .2021206, .0674456, .0128924, .0027307},
87 {.0078498, .0802010, .2456595, .3308175, .2291646, .0836912, .0187016, .0039148},
88 {.0046272, .0563321, .2132296, .3290407, .2599806, .1045974, .0265604, .0056322},
89 {.0024659, .0360957, .1788634, .3210507, .2892537, .1282576, .0360887, .0079244},
90 {.0012702, .0216090, .1472227, .3083032, .3123950, .1522540, .0462449, .0107009},
91 {.0007288, .0134879, .1231200, .2949390, .3258251, .1731879, .0551737, .0135376},
92 {.0004373, .0080115, .1002329, .2779283, .3342611, .1966100, .0650090, .0175099}
93 };
94 static G4double U235nubar [11] = {
95 2.4140000,
96 2.5236700,
97 2.6368200,
98 2.7623400,
99 2.8738400,
100 3.0386999,
101 3.2316099,
102 3.4272800,
103 3.6041900,
104 3.7395900,
105 3.8749800
106 };
107 G4double fraction, r, cum;
108 G4int engind, nu;
109
110 /*
111 Check if nubar is within the range of experimental values
112 */
113 if(nubar >= U235nubar[0] && nubar <= U235nubar[10]) {
114 /*
115 Use Zucker and Holden Data
116 */
117 engind = 1;
118 while (nubar > U235nubar[engind]){ engind++;}
119 // Loop checking, 11.03.2015, T. Koi
120 fraction = (nubar-U235nubar[engind-1])/(U235nubar[engind]-U235nubar[engind-1]);
121 if(fisslibrng() > fraction) engind--;
122
123 r = fisslibrng();
124 nu = 0;
125 cum = U235nu[engind][0];
126 while (r > cum && nu < 7){
127 // Loop checking, 11.03.2015, T. Koi
128 nu++;
129 cum += U235nu[engind][nu];
130 }
131 return nu;
132 } else {
133 /*
134 Use Terrell's formula
135 */
136 return (G4int) G4SmpTerrell(nubar);
137 }
138 }
139