| Geant4 Cross Reference |
1 // 1
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25 //
26 //
27 // This software was developed by Lawrence Liv
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31 //
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33 // this list of conditions and the following
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51 // Copyright (c) 2006 The Regents of the Unive
52 // All rights reserved.
53 // UCRL-CODE-224807
54 //
55 //
56 //
57
58 #include <cmath>
59 #include "G4Pow.hh"
60 #include "G4fissionEvent.hh"
61
62 G4int G4fissionEvent::G4SmpNuDistDataPu239(G4d
63
64 /*
65 Description
66 Sample Number of Neutrons from fission in
67 Zucker and Holden's tabulated data for Pu-
68 */
69
70 /*
71 Input
72 erg - incident neutron energy
73 Output
74 G4SmpNuDistDataPu239 - sampled multiplici
75
76 */
77
78 G4double cpnu;
79 G4double pnu[8] = {0.0, 0.0, 0.0, 0.0, 0.0,
80 G4double eng;
81 G4double r;
82
83 /*
84 Check if energy is within the range of exper
85 */
86 if (erg > 10) eng=10.;
87 else eng=erg;
88
89 r=fisslibrng();
90
91 /*
92 Pu-239 nu distribution
93 */
94 G4Pow* Pow=G4Pow::GetInstance();
95 if (eng <= 5.0) pnu[0] = 0.0108826e0 - 0.002
96 - 6.5e-4*Pow->powN(en
97 - 7.93e-5*Pow->powN(e
98 if (eng > 5 && eng <= 10) pnu[0] = 0.078606e
99 + 1.42034e-
100 + 1.34512e-
101 if (r <= pnu[0]) return 0;
102
103
104 if (eng <= 5.0) pnu[1] = 0.0994916e0 - 0.019
105 - 0.00236583e0*Pow->p
106 - 4.14016667e-4*Pow->
107 if (eng > 5 && eng <= 10) pnu[1] = 0.10052e0
108 + 3.78355e-
109 + 1.95458e-
110 cpnu=pnu[0]+pnu[1];
111 if (r <= cpnu) return 1;
112
113
114 if (eng <= 5.0) pnu[2] = 0.2748898e0 - 0.015
115 - 0.00749681e0*Pow->p
116 - 3.13041667e-4*Pow->
117 if (eng > 5 && eng <= 10) pnu[2] = 0.282487e
118 - 1.16895e-
119 - 6.41257e-
120 cpnu=cpnu+pnu[2];
121 if (r <= cpnu) return 2;
122
123 if (eng <= 5.0) pnu[3] = 0.3269196e0 + 0.004
124 - 0.00189322e0*Pow->p
125 + 1.18466667e-4*Pow->
126 if (eng > 5 && eng <= 10) pnu[3] = 0.329058e
127 - 3.06402e-
128 - 1.50875e-
129 cpnu=cpnu+pnu[3];
130 if (r <= cpnu) return 3;
131
132 if (eng <= 5.0) pnu[4] = 0.2046061e0 + 0.026
133 + 0.0041514e0*Pow->po
134 + 5.0325e-4*Pow->powN
135 if (eng > 5 && eng <= 10) pnu[4] = 0.18992e0
136 - 7.06316e-
137 - 4.71791e-
138 cpnu=cpnu+pnu[4];
139 if (r <= cpnu) return 4;
140
141 if (eng <= 5.0) pnu[5] = 0.0726834e0 + 0.001
142 + 0.007572e0*Pow->pow
143 + 2.3545e-4*Pow->powN
144 if (eng > 5 && eng <= 10) pnu[5] = 0.0779212
145 + 6.68583e-
146 + 4.88625e-
147 cpnu=cpnu+pnu[5];
148 if (r <= cpnu) return 5;
149
150 if (eng <= 5.0) pnu[6] = 0.0097282e0 + 0.004
151 + 0.00115294e0*Pow->p
152 + 6.00083333e-5*Pow->
153 if (eng > 5 && eng <= 10) pnu[6] = 7.85432e-
154 - 2.03705e-
155 - 4.24164e-
156 cpnu=cpnu+pnu[6];
157 if (r <= cpnu) return 6;
158
159 if (eng <= 5.0) pnu[7] = 6.301e-4 + 1.106666
160 + 4.28016667e-4*Pow->
161 - 4.31666667e-6*Pow->
162 if (eng > 5 && eng <= 10) pnu[7] = 1.5323e-3
163 + 8.01017e-
164 + 4.38333e-
165 cpnu=cpnu+pnu[7];
166 if (r <= cpnu) return 7;
167 else return 8;
168 }
169