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51 // Copyright (c) 2006 The Regents of the Unive
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53 // UCRL-CODE-224807
54 //
55 //
56 //
57
58 #include <cmath>
59 #include "G4fissionEvent.hh"
60
61 G4int G4fissionEvent::G4SmpNuDistDataPu239_241
62
63 /*
64 Description
65 Sample Number of Neutrons from fission in
66 Zucker and Holden's tabulated data for Pu-
67 The 11 P(nu) distributions are given as a
68 the average number of neutrons from induce
69 11 different energies (0 to 10 MeV), based
70 from Zucker and Holden.
71 */
72
73 /*
74 Input
75 nubar - average number of neutrons per
76 Output
77 G4SmpNuDistDataPu239_241_MC - sampled mul
78
79 */
80
81 static G4double Pu239nu [11] [9] = {
82 {.0108826, .0994916, .2748898, .3269196,
83 {.0084842, .0790030, .2536175, .3289870,
84 {.0062555, .0611921, .2265608, .3260637,
85 {.0045860, .0477879, .1983002, .3184667,
86 {.0032908, .0374390, .1704196, .3071862,
87 {.0022750, .0291416, .1437645, .2928006,
88 {.0014893, .0222369, .1190439, .2756297,
89 {.0009061, .0163528, .0968110, .2558524,
90 {.0004647, .0113283, .0775201, .2335926,
91 {.0002800, .0071460, .0615577, .2089810,
92 {.0002064, .0038856, .0492548, .1822078,
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 experi
112 */
113 if(nubar >= Pu239nubar[0] && nubar <= Pu239n
114 /*
115 Use Zucker and Holden Data
116 */
117 engind = 1;
118 while (nubar > Pu239nubar[engind]){ engin
119 // Loop checking, 11.03.2015, T. Koi
120 fraction = (nubar-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