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G4SmpNuDistDataPu239.cc
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56 // $Id: G4SmpNuDistDataPu239.cc 67966 2013-03-13 09:38:38Z gcosmo $
57 //
58 
59 #include <cmath>
60 #include "G4Pow.hh"
61 #include "G4fissionEvent.hh"
62 
63 G4int G4fissionEvent::G4SmpNuDistDataPu239(G4double erg) {
64 
65 /*
66  Description
67  Sample Number of Neutrons from fission in Pu-239 using
68  Zucker and Holden's tabulated data for Pu-239
69 */
70 
71 /*
72  Input
73  erg - incident neutron energy
74  Output
75  G4SmpNuDistDataPu239 - sampled multiplicity
76 
77 */
78 
79  G4double cpnu;
80  G4double pnu[8] = {0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0};
81  G4double eng;
82  G4double r;
83 
84 /*
85  Check if energy is within the range of experimental values
86 */
87  if (erg > 10) eng=10.;
88  else eng=erg;
89 
90  r=fisslibrng();
91 
92 /*
93  Pu-239 nu distribution
94 */
96  if (eng <= 5.0) pnu[0] = 0.0108826e0 - 0.00207694e0*eng
97  - 6.5e-4*Pow->powN(eng,2) + 4.023e-4*Pow->powN(eng,3)
98  - 7.93e-5*Pow->powN(eng,4) + 5.53666667e-6*Pow->powN(eng,5);
99  if (eng > 5 && eng <= 10) pnu[0] = 0.078606e0 - 5.17531e-2*eng
100  + 1.42034e-2*Pow->powN(eng,2) - 1.96292e-3*Pow->powN(eng,3)
101  + 1.34512e-4*Pow->powN(eng,4) - 3.63416e-6*Pow->powN(eng,5);
102  if (r <= pnu[0]) return 0;
103 
104 
105  if (eng <= 5.0) pnu[1] = 0.0994916e0 - 0.01979542e0*eng
106  - 0.00236583e0*Pow->powN(eng,2) + 0.0020581e0*Pow->powN(eng,3)
107  - 4.14016667e-4*Pow->powN(eng,4) + 2.85666667e-5*Pow->powN(eng,5);
108  if (eng > 5 && eng <= 10) pnu[1] = 0.10052e0 - 2.61361e-2*eng
109  + 3.78355e-3*Pow->powN(eng,2) - 3.70667e-4*Pow->powN(eng,3)
110  + 1.95458e-5*Pow->powN(eng,4) - 3.87499e-7*Pow->powN(eng,5);
111  cpnu=pnu[0]+pnu[1];
112  if (r <= cpnu) return 1;
113 
114 
115  if (eng <= 5.0) pnu[2] = 0.2748898e0 - 0.01565248e0*eng
116  - 0.00749681e0*Pow->powN(eng,2) + 0.00217121e0*Pow->powN(eng,3)
117  - 3.13041667e-4*Pow->powN(eng,4) + 1.88183333e-5*Pow->powN(eng,5);
118  if (eng > 5 && eng <= 10) pnu[2] = 0.282487e0 - 0.0261342e0*eng
119  - 1.16895e-3*Pow->powN(eng,2) + 1.9888e-4*Pow->powN(eng,3)
120  - 6.41257e-6*Pow->powN(eng,4) + 1.02502e-7*Pow->powN(eng,5);
121  cpnu=cpnu+pnu[2];
122  if (r <= cpnu) return 2;
123 
124  if (eng <= 5.0) pnu[3] = 0.3269196e0 + 0.00428312e0*eng
125  - 0.00189322e0*Pow->powN(eng,2) - 4.31925001e-4*Pow->powN(eng,3)
126  + 1.18466667e-4*Pow->powN(eng,4) - 9.04166668e-6*Pow->powN(eng,5);
127  if (eng > 5 && eng <= 10) pnu[3] = 0.329058e0 + 4.023e-3*eng
128  - 3.06402e-3*Pow->powN(eng,2) + 2.2628e-4*Pow->powN(eng,3)
129  - 1.50875e-5*Pow->powN(eng,4) + 4.39168e-7*Pow->powN(eng,5);
130  cpnu=cpnu+pnu[3];
131  if (r <= cpnu) return 3;
132 
133  if (eng <= 5.0) pnu[4] = 0.2046061e0 + 0.02633899e0*eng
134  + 0.0041514e0*Pow->powN(eng,2) - 0.00275542e0*Pow->powN(eng,3)
135  + 5.0325e-4*Pow->powN(eng,4) - 3.32158333e-5*Pow->powN(eng,5);
136  if (eng > 5 && eng <= 10) pnu[4] = 0.18992e0 + 4.55188e-2*eng
137  - 7.06316e-3*Pow->powN(eng,2) + 7.29916e-4*Pow->powN(eng,3)
138  - 4.71791e-5*Pow->powN(eng,4) + 1.185e-6*Pow->powN(eng,5);
139  cpnu=cpnu+pnu[4];
140  if (r <= cpnu) return 4;
141 
142  if (eng <= 5.0) pnu[5] = 0.0726834e0 + 0.00116043e0*eng
143  + 0.007572e0*Pow->powN(eng,2) - 0.00161972e0*Pow->powN(eng,3)
144  + 2.3545e-4*Pow->powN(eng,4) - 1.546e-5*Pow->powN(eng,5);
145  if (eng > 5 && eng <= 10) pnu[5] = 0.0779212e0 - 1.35849e-3*eng
146  + 6.68583e-3*Pow->powN(eng,2) - 7.98649e-4*Pow->powN(eng,3)
147  + 4.88625e-5*Pow->powN(eng,4) - 1.54167e-6*Pow->powN(eng,5);
148  cpnu=cpnu+pnu[5];
149  if (r <= cpnu) return 5;
150 
151  if (eng <= 5.0) pnu[6] = 0.0097282e0 + 0.00494589e0*eng
152  + 0.00115294e0*Pow->powN(eng,2) - 3.25191667e-4*Pow->powN(eng,3)
153  + 6.00083333e-5*Pow->powN(eng,4) - 3.745e-6*Pow->powN(eng,5);
154  if (eng > 5 && eng <= 10) pnu[6] = 7.85432e-3 + 7.33182e-3*eng
155  - 2.03705e-4*Pow->powN(eng,2) + 8.73787e-5*Pow->powN(eng,3)
156  - 4.24164e-6*Pow->powN(eng,4) + 2.37499e-7*Pow->powN(eng,5);
157  cpnu=cpnu+pnu[6];
158  if (r <= cpnu) return 6;
159 
160  if (eng <= 5.0) pnu[7] = 6.301e-4 + 1.10666667e-4*eng
161  + 4.28016667e-4*Pow->powN(eng,2) + 1.12041667e-5*Pow->powN(eng,3)
162  - 4.31666667e-6*Pow->powN(eng,4) + 3.29166667e-7*Pow->powN(eng,5);
163  if (eng > 5 && eng <= 10) pnu[7] = 1.5323e-3 - 7.91857e-4*eng
164  + 8.01017e-4*Pow->powN(eng,2) - 6.82833e-5*Pow->powN(eng,3)
165  + 4.38333e-6*Pow->powN(eng,4) - 6.0e-8*Pow->powN(eng,5);
166  cpnu=cpnu+pnu[7];
167  if (r <= cpnu) return 7;
168  else return 8;
169 }
static G4Pow * GetInstance()
Definition: G4Pow.cc:55
G4double powN(G4double x, G4int n) const
Definition: G4Pow.cc:128
Definition: G4Pow.hh:56
int G4int
Definition: G4Types.hh:78
double G4double
Definition: G4Types.hh:76