Geant4 9.6.0
Toolkit for the simulation of the passage of particles through matter
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G4SmpSpNugDistData.cc
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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// $Id$
57//
58
59#include "G4fissionEvent.hh"
60
61#define nSPfissg 30
62
63G4int G4fissionEvent::G4SmpSpNugDistData(G4int isotope) {
64
65/*
66 Description
67 Sample Number of Photons from spontaneous fission in
68 (a) Cf-252 using the double Poisson model from Brunson;
69 (b) Th-232,
70 U-232, U-233, U-234, U-235, U-236, U-238*,
71 Np-237,
72 Pu-238*, Pu-239, Pu-240*, Pu-241, Pu-242*,
73 Am-241,
74 Cm-242*, Cm-244*,
75 Bk-249
76 using the negative binomial distribution based on the
77 spontaneous fission neutron nubar from Ensslin's
78 tabulated data or Holden and Zucker's tabulated data
79 (for isotopes denoted with asterix *).
80*/
81
82/*
83 Input
84 iso - isotope
85 Output
86 G4SmpSpNugDistData - sampled multiplicity
87 -1 if there is no multiplicity data for that isotope
88*/
89
90 G4int i;
91 G4double sum, nubar;
92 G4double r;
93
94 static G4double Cf252spdist [nSPfissg] = {
95 5.162699e-4,3.742057e-3,1.360482e-2,3.312786e-2,6.090540e-2,
96 9.043537e-2,1.133984e-1,1.240985e-1,1.216759e-1,1.092255e-1,
97 9.137106e-2,7.219960e-2,5.438060e-2,3.923091e-2,2.714690e-2,
98 1.800781e-2,1.143520e-2,6.942099e-3,4.025720e-3,2.229510e-3,
99 1.179602e-3,5.966936e-4,2.888766e-4,1.340137e-4,5.965291e-5,
100 2.551191e-5,1.049692e-5,4.160575e-6,1.590596e-6,0.000000e+0
101 };
102
103/*
104 sample the spontaneous fission photon number distribution
105*/
106 nubar=0.;
107 if (isotope == 98252) {
108// Cf-252 using the G4double Poisson model from Brunson;
109 r=fisslibrng();
110
111 sum = 0.;
112 for (i = 0; i < nSPfissg-1; i++) {
113 sum = sum + Cf252spdist[i];
114 if (r <= sum || Cf252spdist[i+1] == 0.) return i;
115 }
116 } else if (isotope == 92238) {
117/*
118 using the spontaneous fission nubar from
119 Holden and Zucker's tabulated data
120*/
121 nubar = 1.9900002;
122 } else if (isotope == 94240) {
123 nubar = 2.1540006;
124 } else if (isotope == 94242) {
125 nubar = 2.1489998;
126 } else if (isotope == 96242) {
127 nubar = 2.54;
128 } else if (isotope == 96244) {
129 nubar = 2.7200005;
130 } else if (isotope == 94238) {
131 nubar = 2.2100301;
132 }
133
134 if (nubar != 0.) {
135 return G4SmpNugDist(isotope, nubar);
136 } else {
137/*
138 using the spontaneous fission nubar from
139 N. Ensslin, et.al., "Application Guide to Neutron
140 Multiplicity Counting," LA-13422-M (November 1998)
141*/
142 nubar = G4SmpSpNubarData(isotope);
143 if (nubar != -1.) {
144 return G4SmpNugDist(isotope, nubar);
145 } else {
146// There is no nubar information for that isotope, return -1,
147// meaning no data available for that isotope
148 return -1;
149 }
150 }
151}
#define nSPfissg
double G4double
Definition: G4Types.hh:64
int G4int
Definition: G4Types.hh:66