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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 nSPfissNubarIso 18
61
62 G4double G4fissionEvent::G4SmpSpNubarData(G4int isotope) {
63
64 /*
65 Description
66 Determine average number of neutrons from spontaneous fission for
67 Th-232,
68 U-232, U-233, U-234, U-235, U-236, U-238
69 Np-237,
70 Pu-239, Pu-240, Pu-241, Pu-242
71 Am-241,
72 Cm-242, Cm-244,
73 Bk-249,
74 Cf-252
75 Based on Ensslin's data.
76 N. Ensslin, et.al., "Application Guide to Neutron Multiplicity Counting,"
77 LA-13422-M (November 1998)
78 */
79
80 /*
81 Input
82 iso - isotope
83 Output
84 G4SmpSpNubarData - average number of neutrons
85 -1. is the isotope has
86 no nubar data
87 */
88
89 G4int i;
90
91 static G4int spzaid [nSPfissNubarIso] = {
92 90232, 92232, 92233, 92234, 92235,
93 92236, 92238, 93237, 94238, 94239,
94 94240, 94241, 94242, 95241, 96242,
95 96244, 97249, 98252 };
96 static G4double spnubar [nSPfissNubarIso] = {
97 2.14, 1.71, 1.76, 1.81, 1.86,
98 1.91, 2.01, 2.05, 2.21, 2.16,
99 2.156, 2.25, 2.145, 3.22, 2.54,
100 2.72, 3.40, 3.757
101 };
102
103 // Find nubar
104 for (i=0; i<nSPfissNubarIso; i++) {
105 if (isotope == spzaid[i]) {
106 return spnubar[i];
107 }
108 }
109 // no nubar available for that isotope
110 return -1.;
111 }
112