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27 // This software was developed by Lawrence Livermore National Laboratory.
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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 <cmath>
59 #include "G4Log.hh"
60 #include "G4Pow.hh"
61 #include "G4fissionEvent.hh"
62
63 G4double G4fissionEvent::G4SmpGEng() {
64
65 /*
66 Description
67 Sample energy spectrum for photons emitted by fission-induced reactions.
68 The energy spectrum of the prompt fission gamma rays is obtained from
69 Maienschein's measurements.
70 */
71
72 /*
73 Input
74 Return
75 energy of photon emitted by neutron-induced fission
76 */
77
78 G4double r;
79 /*
80 Calculate the energy of photons emitted from fission
81 */
82 G4Pow* Pow=G4Pow::GetInstance();
83 r=fisslibrng();
84
85 if (r == 0.0) return 0.085;
86
87 if (r <= 0.0001) return 0.0855+0.01692*(r/0.0001)-0.02401*Pow->powA(r/0.0001,2.)+0.01274*Pow->powA(r/0.0001,3.);
88
89 if (r > 0.0001 && r <= 0.01) return 0.09141 + 0.23846*((r-0.0001)/0.0099)
90 - 1.75947*Pow->powA((r-.0001)/0.0099,2.)
91 + 10.98611*Pow->powA((r-0.0001)/0.0099,3.)
92 - 43.19181*Pow->powA((r-.0001)/0.0099,4.)
93 +105.70005*Pow->powA((r-.0001)/.0099,5.)
94 -160.72894*Pow->powA((r-.0001)/.0099,6.)
95 +147.43399*Pow->powA((r-.0001)/.0099,7.)
96 - 74.60043*Pow->powA((r-.0001)/0.0099,8.)
97 + 15.97547*Pow->powA((r-.0001)/0.0099,9.);
98
99 if (r > 0.01 && r <= 0.1537) return 0.14486 + 0.40914*((r-.01)/.1437)
100 - 1.28150*Pow->powA((r-0.01)/0.1437,2.)
101 + 5.07377*Pow->powA((r-0.01)/0.1437,3.)
102 -15.42031*Pow->powA((r-0.01)/0.1437,4.)
103 +31.96346*Pow->powA((r-0.01)/0.1437,5.)
104 -43.12605*Pow->powA((r-0.01)/0.1437,6.)
105 +36.02908*Pow->powA((r-0.01)/0.1437,7.)
106 -16.87185*Pow->powA((r-0.01)/0.1437,8.)
107 + 3.37941*Pow->powA((r-0.01)/0.1437,9.);
108
109 if (r > 0.1537 && r <= 0.7114) return (-1./2.3)*G4Log(0.71956*(0.1537-r)+0.50158);
110
111 if (r > 0.7114 && r <= 1.0) return (-1./1.1)*G4Log(1.15292*(0.7114-r)+0.33287);
112 //
113 // Fall through
114 //
115 G4cout << " Random number out of range in SmpGEng " << G4endl;
116 return -1.0;
117 }
118