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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::G4SmpNuDistDataPu239_241_MC(G4double nubar) {
62
63 /*
64 Description
65 Sample Number of Neutrons from fission in Pu-239 and Pu-241 using
66 Zucker and Holden's tabulated data for Pu-239
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 Pu-239 data
70 from Zucker and Holden.
71 */
72
73 /*
74 Input
75 nubar - average number of neutrons per fission
76 Output
77 G4SmpNuDistDataPu239_241_MC - sampled multiplicity
78
79 */
80
81 static G4double Pu239nu [11] [9] = {
82 {.0108826, .0994916, .2748898, .3269196, .2046061, .0726834, .0097282, .0006301, .0001685},
83 {.0084842, .0790030, .2536175, .3289870, .2328111, .0800161, .0155581, .0011760, .0003469},
84 {.0062555, .0611921, .2265608, .3260637, .2588354, .0956070, .0224705, .0025946, .0005205},
85 {.0045860, .0477879, .1983002, .3184667, .2792811, .1158950, .0301128, .0048471, .0007233},
86 {.0032908, .0374390, .1704196, .3071862, .2948565, .1392594, .0386738, .0078701, .0010046},
87 {.0022750, .0291416, .1437645, .2928006, .3063902, .1641647, .0484343, .0116151, .0014149},
88 {.0014893, .0222369, .1190439, .2756297, .3144908, .1892897, .0597353, .0160828, .0029917},
89 {.0009061, .0163528, .0968110, .2558524, .3194566, .2134888, .0729739, .0213339, .0020017},
90 {.0004647, .0113283, .0775201, .2335926, .3213289, .2356614, .0886183, .0274895, .0039531},
91 {.0002800, .0071460, .0615577, .2089810, .3200121, .2545846, .1072344, .0347255, .0054786},
92 {.0002064, .0038856, .0492548, .1822078, .3154159, .2687282, .1295143, .0432654, .0075217}
93 };
94 static G4double Pu239nubar [11] = {
95 2.8760000,
96 3.0088800,
97 3.1628300,
98 3.3167800,
99 3.4707300,
100 3.6246800,
101 3.7786300,
102 3.9325800,
103 4.0865300,
104 4.2404900,
105 4.3944400
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 >= Pu239nubar[0] && nubar <= Pu239nubar[10]) {
114 /*
115 Use Zucker and Holden Data
116 */
117 engind = 1;
118 while (nubar > Pu239nubar[engind]){ engind++;}
119 // Loop checking, 11.03.2015, T. Koi
120 fraction = (nubar-Pu239nubar[engind-1])/(Pu239nubar[engind]-Pu239nubar[engind-1]);
121 if(fisslibrng() > fraction) engind--;
122
123 r = fisslibrng();
124 nu = 0;
125 cum = Pu239nu[engind][0];
126 while (r > cum && nu < 8){
127 // Loop checking, 11.03.2015, T. Koi
128 nu++;
129 cum += Pu239nu[engind][nu];
130 }
131 return nu;
132 } else {
133 /*
134 Use Terrell's formula
135 */
136 return (G4int) G4SmpTerrell(nubar);
137 }
138 }
139