Geant4  10.01.p01
G4SmpGEng.cc
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56 // $Id: G4SmpGEng.cc 67966 2013-03-13 09:38:38Z gcosmo $
57 //
58 
59 #include <cmath>
60 #include "G4fissionEvent.hh"
61 
63 
64 /*
65  Description
66  Sample energy spectrum for photons emitted by fission-induced reactions.
67  The energy spectrum of the prompt fission gamma rays is obtained from
68  Maienschein's measurements.
69 */
70 
71 /*
72  Input
73  Return
74  energy of photon emitted by neutron-induced fission
75 */
76 
77  G4double r;
78 /*
79  Calculate the energy of photons emitted from fission
80 */
81  r=fisslibrng();
82 
83  if (r == 0.0) return 0.085;
84 
85  if (r <= 0.0001) return 0.0855+0.01692*(r/0.0001)-0.02401*std::pow(r/0.0001,2.)+0.01274*std::pow(r/0.0001,3.);
86 
87  if (r > 0.0001 && r <= 0.01) return 0.09141 + 0.23846*((r-0.0001)/0.0099)
88  - 1.75947*std::pow((r-.0001)/0.0099,2.)
89  + 10.98611*std::pow((r-0.0001)/0.0099,3.)
90  - 43.19181*std::pow((r-.0001)/0.0099,4.)
91  +105.70005*std::pow((r-.0001)/.0099,5.)
92  -160.72894*std::pow((r-.0001)/.0099,6.)
93  +147.43399*std::pow((r-.0001)/.0099,7.)
94  - 74.60043*std::pow((r-.0001)/0.0099,8.)
95  + 15.97547*std::pow((r-.0001)/0.0099,9.);
96 
97  if (r > 0.01 && r <= 0.1537) return 0.14486 + 0.40914*((r-.01)/.1437)
98  - 1.28150*std::pow((r-0.01)/0.1437,2.)
99  + 5.07377*std::pow((r-0.01)/0.1437,3.)
100  -15.42031*std::pow((r-0.01)/0.1437,4.)
101  +31.96346*std::pow((r-0.01)/0.1437,5.)
102  -43.12605*std::pow((r-0.01)/0.1437,6.)
103  +36.02908*std::pow((r-0.01)/0.1437,7.)
104  -16.87185*std::pow((r-0.01)/0.1437,8.)
105  + 3.37941*std::pow((r-0.01)/0.1437,9.);
106 
107  if (r > 0.1537 && r <= 0.7114) return (-1./2.3)*std::log(0.71956*(0.1537-r)+0.50158);
108 
109  if (r > 0.7114 && r <= 1.0) return (-1./1.1)*std::log(1.15292*(0.7114-r)+0.33287);
110  //
111  // Fall through
112  //
113  G4cout << " Random number out of range in SmpGEng " << G4endl;
114  return -1.0;
115 }
static G4double fisslibrng(void)
Definition: G4rngc.cc:65
G4double G4SmpGEng()
Definition: G4SmpGEng.cc:62
G4GLOB_DLL std::ostream G4cout
#define G4endl
Definition: G4ios.hh:61
double G4double
Definition: G4Types.hh:76