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