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51 // Copyright (c) 2006 The Regents of the Unive 51 // Copyright (c) 2006 The Regents of the University of California.
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53 // UCRL-CODE-224807 53 // UCRL-CODE-224807
54 // 54 //
55 // 55 //
>> 56 // $Id: G4SmpNuDistDataU233_235.cc 67966 2013-03-13 09:38:38Z gcosmo $
56 // 57 //
57 58
58 #include <cmath> 59 #include <cmath>
59 #include "G4fissionEvent.hh" 60 #include "G4fissionEvent.hh"
60 #include "G4Exp.hh" <<
61 #include "G4Pow.hh" <<
62 61
63 int G4fissionEvent::G4SmpNuDistDataU233_235(G4 62 int G4fissionEvent::G4SmpNuDistDataU233_235(G4double nubar) {
64 63
65 G4Pow* Pow = G4Pow::GetInstance(); <<
66 /* 64 /*
67 Description 65 Description
68 Sample Number of Neutrons from fission in 66 Sample Number of Neutrons from fission in U-233 and U-235 using
69 Zucker and Holden's tabulated data for U-2 67 Zucker and Holden's tabulated data for U-235
70 The P(nu) distribution is given as a funct 68 The P(nu) distribution is given as a function of the average
71 number of neutrons from fission, based on 69 number of neutrons from fission, based on interpolation of the
72 U-235 data from Zucker and Holden. 70 U-235 data from Zucker and Holden.
73 */ 71 */
74 72
75 /* 73 /*
76 Input 74 Input
77 nubar - average number of neutrons per 75 nubar - average number of neutrons per fission
78 Output 76 Output
79 G4SmpNuDistDataU233_235 - sampled multipl 77 G4SmpNuDistDataU233_235 - sampled multiplicity
80 78
81 */ 79 */
82 80
83 G4double pnu[8], cpnu, sum; 81 G4double pnu[8], cpnu, sum;
84 G4double r; 82 G4double r;
85 83
86 /* 84 /*
87 Check if nubar is within the range of experi 85 Check if nubar is within the range of experimental values
88 */ 86 */
89 if(nubar >= 2.25 && nubar <= 4.0) { 87 if(nubar >= 2.25 && nubar <= 4.0) {
90 /* 88 /*
91 Use Zucker and Holden Data 89 Use Zucker and Holden Data
92 */ 90 */
93 if(nubar <= 2.8738) pnu[0]=-9.279554e-02* << 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;
94 else if(nubar > 2.8738 && nubar <= 3.4272 << 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;
95 else pnu[0]=1.498897e+3*G4Exp(-3.883864*n << 93 else pnu[0]=1.498897e+3*std::exp(-3.883864*nubar);
96 94
97 if(nubar <= 3.2316) pnu[1]=3.531126e-2*Po << 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;
98 else pnu[1]=6.574492e-2*Pow->powN(nubar,2 << 96 else pnu[1]=6.574492e-2*std::pow(nubar,2)-5.425741e-1*nubar+1.123199;
99 97
100 pnu[2]=1.274643e-2*Pow->powN(nubar,3)-1.3 << 98 pnu[2]=1.274643e-2*std::pow(nubar,3)-1.387954e-1*std::pow(nubar,2)+3.264669e-1*nubar+1.77148e-1;
101 99
102 pnu[3]=5.473738e-2*Pow->powN(nubar,5)-8.8 << 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;
103 101
104 pnu[4]=-3.591076e-2*Pow->powN(nubar,3)+3. << 102 pnu[4]=-3.591076e-2*std::pow(nubar,3)+3.092624e-1*std::pow(nubar,2)-7.184805e-1*nubar+5.649400e-1;
105 103
106 if(nubar <= 2.8738) pnu[5]=1.699374e-2*Po << 104 if(nubar <= 2.8738) pnu[5]=1.699374e-2*std::pow(nubar,2)-1.069558e-3*nubar-6.981430e-2;
107 else pnu[5]=2.100175e-2*Pow->powN(nubar,3 << 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;
108 106
109 if(nubar <= 3.0387) pnu[6]=9.431919e-7*Po << 107 if(nubar <= 3.0387) pnu[6]=9.431919e-7*std::pow(nubar,8.958848);
110 else pnu[6]=4.322428e-3*Pow->powN(nubar,3 << 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;
111 109
112 pnu[7]=5.689084e-3*Pow->powN(nubar,4)-6.5 << 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;
113 111
114 sum=pnu[0]+pnu[1]+pnu[2]+pnu[3]+pnu[4]+pn 112 sum=pnu[0]+pnu[1]+pnu[2]+pnu[3]+pnu[4]+pnu[5]+pnu[6]+pnu[7];
115 113
116 pnu[0]=pnu[0]/sum; 114 pnu[0]=pnu[0]/sum;
117 pnu[1]=pnu[1]/sum; 115 pnu[1]=pnu[1]/sum;
118 pnu[2]=pnu[2]/sum; 116 pnu[2]=pnu[2]/sum;
119 pnu[3]=pnu[3]/sum; 117 pnu[3]=pnu[3]/sum;
120 pnu[4]=pnu[4]/sum; 118 pnu[4]=pnu[4]/sum;
121 pnu[5]=pnu[5]/sum; 119 pnu[5]=pnu[5]/sum;
122 pnu[6]=pnu[6]/sum; 120 pnu[6]=pnu[6]/sum;
123 pnu[7]=pnu[7]/sum; 121 pnu[7]=pnu[7]/sum;
124 122
125 r=fisslibrng(); 123 r=fisslibrng();
126 124
127 if(r <= pnu[0]) return (int) 0; 125 if(r <= pnu[0]) return (int) 0;
128 126
129 cpnu=pnu[0]+pnu[1]; 127 cpnu=pnu[0]+pnu[1];
130 if(r <= cpnu) return (int) 1; 128 if(r <= cpnu) return (int) 1;
131 129
132 cpnu=cpnu+pnu[2]; 130 cpnu=cpnu+pnu[2];
133 if(r <= cpnu) return (int) 2; 131 if(r <= cpnu) return (int) 2;
134 132
135 cpnu=cpnu+pnu[3]; 133 cpnu=cpnu+pnu[3];
136 if(r <= cpnu) return (int) 3; 134 if(r <= cpnu) return (int) 3;
137 135
138 cpnu=cpnu+pnu[4]; 136 cpnu=cpnu+pnu[4];
139 if(r <= cpnu) return (int) 4; 137 if(r <= cpnu) return (int) 4;
140 138
141 cpnu=cpnu+pnu[5]; 139 cpnu=cpnu+pnu[5];
142 if(r <= cpnu) return (int) 5; 140 if(r <= cpnu) return (int) 5;
143 141
144 cpnu=cpnu+pnu[6]; 142 cpnu=cpnu+pnu[6];
145 if(r <= cpnu) return (int) 6; 143 if(r <= cpnu) return (int) 6;
146 else return (int) 7; 144 else return (int) 7;
147 } else { 145 } else {
148 /* 146 /*
149 Use Terrell's formula 147 Use Terrell's formula
150 */ 148 */
151 return (int) G4SmpTerrell(nubar); 149 return (int) G4SmpTerrell(nubar);
152 } 150 }
153 } 151 }
154 152