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G4SmpNuDistDataU233_235.cc
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56 // $Id: G4SmpNuDistDataU233_235.cc 69860 2013-05-16 14:39:02Z gcosmo $
57 //
58 
59 #include <cmath>
60 #include "G4fissionEvent.hh"
61 
62 int G4fissionEvent::G4SmpNuDistDataU233_235(G4double nubar) {
63 
64 /*
65  Description
66  Sample Number of Neutrons from fission in U-233 and U-235 using
67  Zucker and Holden's tabulated data for U-235
68  The P(nu) distribution is given as a function of the average
69  number of neutrons from fission, based on interpolation of the
70  U-235 data from Zucker and Holden.
71 */
72 
73 /*
74  Input
75  nubar - average number of neutrons per fission
76  Output
77  G4SmpNuDistDataU233_235 - sampled multiplicity
78 
79 */
80 
81  G4double pnu[8], cpnu, sum;
82  G4double r;
83 
84 /*
85  Check if nubar is within the range of experimental values
86 */
87  if(nubar >= 2.25 && nubar <= 4.0) {
88 /*
89  Use Zucker and Holden Data
90 */
91  if(nubar <= 2.8738) pnu[0]=-9.279554e-02*std::pow(nubar,3)+8.036687e-01*std::pow(nubar,2)-2.342684*nubar+2.309035;
92  else if(nubar > 2.8738 && nubar <= 3.4272) pnu[0]=1.50072e-2*std::pow(nubar,2)-1.109109e-1*nubar+2.063133e-1;
93  else pnu[0]=1.498897e+3*std::exp(-3.883864*nubar);
94 
95  if(nubar <= 3.2316) pnu[1]=3.531126e-2*std::pow(nubar,3)-2.787213e-1*std::pow(nubar,2)+5.824072e-1*nubar-1.067136e-1;
96  else pnu[1]=6.574492e-2*std::pow(nubar,2)-5.425741e-1*nubar+1.123199;
97 
98  pnu[2]=1.274643e-2*std::pow(nubar,3)-1.387954e-1*std::pow(nubar,2)+3.264669e-1*nubar+1.77148e-1;
99 
100  pnu[3]=5.473738e-2*std::pow(nubar,5)-8.835826e-1*std::pow(nubar,4)+5.657201*std::pow(nubar,3)-1.802669e+1*std::pow(nubar,2)+2.867937e+1*nubar-1.794296e+1;
101 
102  pnu[4]=-3.591076e-2*std::pow(nubar,3)+3.092624e-1*std::pow(nubar,2)-7.184805e-1*nubar+5.649400e-1;
103 
104  if(nubar <= 2.8738) pnu[5]=1.699374e-2*std::pow(nubar,2)-1.069558e-3*nubar-6.981430e-2;
105  else pnu[5]=2.100175e-2*std::pow(nubar,3)-1.705788e-1*std::pow(nubar,2)+5.575467e-1*nubar-6.245873e-1;
106 
107  if(nubar <= 3.0387) pnu[6]=9.431919e-7*std::pow(nubar,8.958848);
108  else pnu[6]=4.322428e-3*std::pow(nubar,3)-2.094790e-2*std::pow(nubar,2)+4.449671e-2*nubar-4.435987e-2;
109 
110  pnu[7]=5.689084e-3*std::pow(nubar,4)-6.591895e-2*std::pow(nubar,3)+2.886861e-1*std::pow(nubar,2)-5.588146e-1*nubar+4.009166e-1;
111 
112  sum=pnu[0]+pnu[1]+pnu[2]+pnu[3]+pnu[4]+pnu[5]+pnu[6]+pnu[7];
113 
114  pnu[0]=pnu[0]/sum;
115  pnu[1]=pnu[1]/sum;
116  pnu[2]=pnu[2]/sum;
117  pnu[3]=pnu[3]/sum;
118  pnu[4]=pnu[4]/sum;
119  pnu[5]=pnu[5]/sum;
120  pnu[6]=pnu[6]/sum;
121  pnu[7]=pnu[7]/sum;
122 
123  r=fisslibrng();
124 
125  if(r <= pnu[0]) return (int) 0;
126 
127  cpnu=pnu[0]+pnu[1];
128  if(r <= cpnu) return (int) 1;
129 
130  cpnu=cpnu+pnu[2];
131  if(r <= cpnu) return (int) 2;
132 
133  cpnu=cpnu+pnu[3];
134  if(r <= cpnu) return (int) 3;
135 
136  cpnu=cpnu+pnu[4];
137  if(r <= cpnu) return (int) 4;
138 
139  cpnu=cpnu+pnu[5];
140  if(r <= cpnu) return (int) 5;
141 
142  cpnu=cpnu+pnu[6];
143  if(r <= cpnu) return (int) 6;
144  else return (int) 7;
145  } else {
146 /*
147  Use Terrell's formula
148 */
149  return (int) G4SmpTerrell(nubar);
150  }
151 }