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G4SmpNuDistDataPu239_241.cc
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56 // $Id: G4SmpNuDistDataPu239_241.cc 67966 2013-03-13 09:38:38Z gcosmo $
57 //
58 
59 #include <cmath>
60 #include "G4Pow.hh"
61 #include "G4fissionEvent.hh"
62 
63 G4int G4fissionEvent::G4SmpNuDistDataPu239_241(G4double nubar) {
64 
65 /*
66  Description
67  Sample Number of Neutrons from fission in Pu-239 and Pu-241 using
68  Zucker and Holden's tabulated data for Pu-239
69  The P(nu) distribution is given as a function of the average
70  number of neutrons from fission, based on interpolation of the
71  Pu-239 data from Zucker and Holden.
72 */
73 
74 /*
75  Input
76  nubar - average number of neutrons per fission
77  Output
78  G4SmpNuDistDataPu239_241 - sampled multiplicity
79 
80 */
81 
82  G4double pnu[9], cpnu, sum;
83  G4double r;
84 
85 /*
86  Check if nubar is within the range of experimental values
87 */
88  if(nubar >= 2.85 && nubar <= 4.25) {
89 /*
90  Use Zucker and Holden Data
91 */
93  pnu[0]=-2.412937e-3*Pow->powN(nubar,3)+3.210687e-2*Pow->powN(nubar,2)-1.434037e-1*nubar+2.150733e-1;
94  pnu[1]=-2.650615e-2*Pow->powN(nubar,3)+3.290389e-1*Pow->powN(nubar,2)-1.389007*nubar+2.002327;
95  pnu[2]=3.232028e-2*Pow->powN(nubar,3)-3.176093e-1*Pow->powN(nubar,2)+8.605098e-1*nubar-3.411191e-1;
96  pnu[3]=1.623289e-2*Pow->powN(nubar,3)-2.414705e-1*Pow->powN(nubar,2)+1.007282*nubar-9.583769e-1;
97  pnu[4]=1.932275e-2*Pow->powN(nubar,3)-2.923666e-1*Pow->powN(nubar,2)+1.421383*nubar-1.924025;
98  pnu[5]=-6.185679e-2*Pow->powN(nubar,3)+6.82888e-1*Pow->powN(nubar,2)-2.347653*nubar+2.647049;
99  pnu[6]=1.79773e-2*Pow->powN(nubar,3)-1.60516e-1*Pow->powN(nubar,2)+5.228077e-1*nubar-5.939556e-1;
100  pnu[7]=3.530038e-3*Pow->powN(nubar,4)-4.925425e-2*Pow->powN(nubar,3)+2.726784e-1*Pow->powN(nubar,2)-6.81281e-1*nubar+6.347577e-1;
101  pnu[8]=2.837523e-3*Pow->powN(nubar,3)-2.678644e-2*Pow->powN(nubar,2)+8.545638e-2*nubar-9.156078e-2;
102 
103  sum=pnu[0]+pnu[1]+pnu[2]+pnu[3]+pnu[4]+pnu[5]+pnu[6]+pnu[7]+pnu[8];
104 
105  pnu[0]=pnu[0]/sum;
106  pnu[1]=pnu[1]/sum;
107  pnu[2]=pnu[2]/sum;
108  pnu[3]=pnu[3]/sum;
109  pnu[4]=pnu[4]/sum;
110  pnu[5]=pnu[5]/sum;
111  pnu[6]=pnu[6]/sum;
112  pnu[7]=pnu[7]/sum;
113  pnu[8]=pnu[8]/sum;
114 
115  r=fisslibrng();
116 
117  if(r <= pnu[0]) return 0;
118 
119  cpnu=pnu[0]+pnu[1];
120  if(r <= cpnu) return 1;
121 
122  cpnu=cpnu+pnu[2];
123  if(r <= cpnu) return 2;
124 
125  cpnu=cpnu+pnu[3];
126  if(r <= cpnu) return 3;
127 
128  cpnu=cpnu+pnu[4];
129  if(r <= cpnu) return 4;
130 
131  cpnu=cpnu+pnu[5];
132  if(r <= cpnu) return 5;
133 
134  cpnu=cpnu+pnu[6];
135  if(r <= cpnu) return 6;
136 
137  cpnu=cpnu+pnu[7];
138  if(r <= cpnu) return 7;
139  else return 8;
140 
141  } else {
142 /*
143  Use Terrell's formula
144 */
145  return (G4int) G4SmpTerrell(nubar);
146  }
147 }
static G4Pow * GetInstance()
Definition: G4Pow.cc:55
G4double powN(G4double x, G4int n) const
Definition: G4Pow.cc:128
Definition: G4Pow.hh:56
int G4int
Definition: G4Types.hh:78
double G4double
Definition: G4Types.hh:76