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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 "G4Log.hh"
61 #include "G4Pow.hh"
62 #include "G4fissionEvent.hh"
63 
64 G4double G4fissionEvent::G4SmpGEng() {
65 
66 /*
67  Description
68  Sample energy spectrum for photons emitted by fission-induced reactions.
69  The energy spectrum of the prompt fission gamma rays is obtained from
70  Maienschein's measurements.
71 */
72 
73 /*
74  Input
75  Return
76  energy of photon emitted by neutron-induced fission
77 */
78 
79  G4double r;
80 /*
81  Calculate the energy of photons emitted from fission
82 */
84  r=fisslibrng();
85 
86  if (r == 0.0) return 0.085;
87 
88  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.);
89 
90  if (r > 0.0001 && r <= 0.01) return 0.09141 + 0.23846*((r-0.0001)/0.0099)
91  - 1.75947*Pow->powA((r-.0001)/0.0099,2.)
92  + 10.98611*Pow->powA((r-0.0001)/0.0099,3.)
93  - 43.19181*Pow->powA((r-.0001)/0.0099,4.)
94  +105.70005*Pow->powA((r-.0001)/.0099,5.)
95  -160.72894*Pow->powA((r-.0001)/.0099,6.)
96  +147.43399*Pow->powA((r-.0001)/.0099,7.)
97  - 74.60043*Pow->powA((r-.0001)/0.0099,8.)
98  + 15.97547*Pow->powA((r-.0001)/0.0099,9.);
99 
100  if (r > 0.01 && r <= 0.1537) return 0.14486 + 0.40914*((r-.01)/.1437)
101  - 1.28150*Pow->powA((r-0.01)/0.1437,2.)
102  + 5.07377*Pow->powA((r-0.01)/0.1437,3.)
103  -15.42031*Pow->powA((r-0.01)/0.1437,4.)
104  +31.96346*Pow->powA((r-0.01)/0.1437,5.)
105  -43.12605*Pow->powA((r-0.01)/0.1437,6.)
106  +36.02908*Pow->powA((r-0.01)/0.1437,7.)
107  -16.87185*Pow->powA((r-0.01)/0.1437,8.)
108  + 3.37941*Pow->powA((r-0.01)/0.1437,9.);
109 
110  if (r > 0.1537 && r <= 0.7114) return (-1./2.3)*G4Log(0.71956*(0.1537-r)+0.50158);
111 
112  if (r > 0.7114 && r <= 1.0) return (-1./1.1)*G4Log(1.15292*(0.7114-r)+0.33287);
113  //
114  // Fall through
115  //
116  G4cout << " Random number out of range in SmpGEng " << G4endl;
117  return -1.0;
118 }
static G4Pow * GetInstance()
Definition: G4Pow.cc:55
G4double powA(G4double A, G4double y) const
Definition: G4Pow.hh:259
Definition: G4Pow.hh:56
G4GLOB_DLL std::ostream G4cout
G4double G4Log(G4double x)
Definition: G4Log.hh:230
#define G4endl
Definition: G4ios.hh:61
double G4double
Definition: G4Types.hh:76