Geant4  v4-10.4-release
G4SmpNugDist.cc
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51 // Copyright (c) 2006 The Regents of the University of California.
53 // UCRL-CODE-224807
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56 // $Id: G4SmpNugDist.cc 68799 2013-04-05 13:29:46Z gcosmo$
57 //
58
59 #include <cmath>
60 #include "G4fissionEvent.hh"
61 #include "G4Exp.hh"
62 #include "G4Log.hh"
63 #include "G4Pow.hh"
64
65 #define nfissg 40
66 #define alphanegbin 26
67
69
70 /*
71  Description
72  Sample Number of Photons from neutron induced fission in
73  all isotopes using Tim Valentine's model (negative binomial
74  distribution, using nubar as a model parameter)
75 */
76
77 /*
78  Input
79  iso - isotope
80  Output
81  G4SmpNugDist - sampled multiplicity
82 */
83
84  static G4double logcoeff[nfissg+1] = {
85  0.00000000000000e+00,
86  3.25809653802149e+00,
87  5.86078622346587e+00,
88  8.09437844497297e+00,
89  1.00753799138395e+01,
90  1.18671393830676e+01,
91  1.35093671183247e+01,
92  1.50291928720691e+01,
93  1.64462588918558e+01,
94  1.77753948391357e+01,
95  1.90281578076311e+01,
96  2.02137814732888e+01,
97  2.13397927361450e+01,
98  2.24124295384099e+01,
99  2.34369338549243e+01,
100  2.44177631079360e+01,
101  2.53587464524005e+01,
102  2.62632027266277e+01,
103  2.71340310844251e+01,
104  2.79737817391769e+01,
105  2.87847119553932e+01,
106  2.95688309141589e+01,
107  3.03279360625106e+01,
108  3.10636428574894e+01,
109  3.17774093252521e+01,
110  3.24705565058120e+01,
111  3.31442856005149e+01,
112  3.37996924530920e+01,
113  3.44377798564689e+01,
114  3.50594680730467e+01,
115  3.56656038766170e+01,
116  3.62569683628670e+01,
117  3.68342837279018e+01,
118  3.73982191769817e+01,
119  3.79493960962713e+01,
120  3.84883925970040e+01,
121  3.90157475227212e+01,
122  3.95319639951220e+01,
123  4.00375125617872e+01,
124  4.05328339990172e+01,
125  4.10183418147990e+01
126  };
127  G4int i, A, Z;
128  G4double cpi[nfissg+1];
129  G4double p, q, nubarg;
130  G4double r;
131
132 /*
133  No data is available for induced fission gamma number
134  distributions. Sample the negative binomial cumulative
135  probability distribution.
136 */
137  A = (G4int) (isotope-1000*((G4int)(isotope/1000)));
138  Z = (G4int) ((isotope-A)/1000);
139  G4Pow* Pow = G4Pow::GetInstance();
140  nubarg = ((2.51-1.13e-5*Pow->powA(G4double(Z),2.)*std::sqrt(G4double(A)))*nubar+4.0)
141  /(-1.33+119.6*Pow->A13(G4double(Z))/G4double(A));
142  p = 1.*alphanegbin/(alphanegbin+nubarg);
143  q = 1.-p;
144  cpi[0] = G4Exp(logcoeff[0]+26.*G4Log(p));
145  for (i=1; i<=nfissg; i++) cpi[i] = cpi[i-1] + G4Exp(logcoeff[i]+26.*G4Log(p)+i*G4Log(q));
146  for (i=0; i<=nfissg; i++) cpi[i] = cpi[i]/cpi[nfissg-1];
147
148  r=fisslibrng();
149
150  for(i=0; i<=nfissg; i++) if (r <= cpi[i]) return i;
151
152  //
153  // Fall through
154  //
155
156  G4cout << " SmpNugDist: random number " << r << " out of range " << G4endl;
157  return -1;
158
159 }
G4double G4Exp(G4double initial_x)
Exponential Function double precision.
Definition: G4Exp.hh:183
G4double A13(G4double A) const
Definition: G4Pow.cc:138
#define G4endl
Definition: G4ios.hh:61
const char * p
Definition: xmltok.h:285
G4double G4Log(G4double x)
Definition: G4Log.hh:230
Float_t Z
double G4double
Definition: G4Types.hh:76
static G4Pow * GetInstance()
Definition: G4Pow.cc:57
G4double powA(G4double A, G4double y) const
Definition: G4Pow.hh:242
double A(double temperature)
#define alphanegbin
Definition: G4SmpNugDist.cc:66
int G4int
Definition: G4Types.hh:78
G4int G4SmpNugDist(G4int isotope, G4double nubar)
Definition: G4SmpNugDist.cc:68
Definition: G4Pow.hh:56
G4GLOB_DLL std::ostream G4cout
#define nfissg
Definition: G4SmpNugDist.cc:65
static G4double fisslibrng(void)
Definition: G4rngc.cc:65