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51 // Copyright (c) 2006 The Regents of the Unive 51 // Copyright (c) 2006 The Regents of the University of California.
52 // All rights reserved. 52 // All rights reserved.
53 // UCRL-CODE-224807 53 // UCRL-CODE-224807
54 // 54 //
55 // 55 //
56 // 56 //
57 57
58 #include <cmath> 58 #include <cmath>
59 #include "G4Pow.hh" 59 #include "G4Pow.hh"
60 #include "G4fissionEvent.hh" 60 #include "G4fissionEvent.hh"
61 61
62 G4int G4fissionEvent::G4SmpNuDistDataPu239_241 62 G4int G4fissionEvent::G4SmpNuDistDataPu239_241(G4double nubar) {
63 63
64 /* 64 /*
65 Description 65 Description
66 Sample Number of Neutrons from fission in 66 Sample Number of Neutrons from fission in Pu-239 and Pu-241 using
67 Zucker and Holden's tabulated data for Pu- 67 Zucker and Holden's tabulated data for Pu-239
68 The P(nu) distribution is given as a funct 68 The P(nu) distribution is given as a function of the average
69 number of neutrons from fission, based on 69 number of neutrons from fission, based on interpolation of the
70 Pu-239 data from Zucker and Holden. 70 Pu-239 data from Zucker and Holden.
71 */ 71 */
72 72
73 /* 73 /*
74 Input 74 Input
75 nubar - average number of neutrons per 75 nubar - average number of neutrons per fission
76 Output 76 Output
77 G4SmpNuDistDataPu239_241 - sampled multip 77 G4SmpNuDistDataPu239_241 - sampled multiplicity
78 78
79 */ 79 */
80 80
81 G4double pnu[9], cpnu, sum; 81 G4double pnu[9], cpnu, sum;
82 G4double r; 82 G4double r;
83 83
84 /* 84 /*
85 Check if nubar is within the range of experi 85 Check if nubar is within the range of experimental values
86 */ 86 */
87 if(nubar >= 2.85 && nubar <= 4.25) { 87 if(nubar >= 2.85 && nubar <= 4.25) {
88 /* 88 /*
89 Use Zucker and Holden Data 89 Use Zucker and Holden Data
90 */ 90 */
91 G4Pow* Pow=G4Pow::GetInstance(); 91 G4Pow* Pow=G4Pow::GetInstance();
92 pnu[0]=-2.412937e-3*Pow->powN(nubar,3)+3. 92 pnu[0]=-2.412937e-3*Pow->powN(nubar,3)+3.210687e-2*Pow->powN(nubar,2)-1.434037e-1*nubar+2.150733e-1;
93 pnu[1]=-2.650615e-2*Pow->powN(nubar,3)+3. 93 pnu[1]=-2.650615e-2*Pow->powN(nubar,3)+3.290389e-1*Pow->powN(nubar,2)-1.389007*nubar+2.002327;
94 pnu[2]=3.232028e-2*Pow->powN(nubar,3)-3.1 94 pnu[2]=3.232028e-2*Pow->powN(nubar,3)-3.176093e-1*Pow->powN(nubar,2)+8.605098e-1*nubar-3.411191e-1;
95 pnu[3]=1.623289e-2*Pow->powN(nubar,3)-2.4 95 pnu[3]=1.623289e-2*Pow->powN(nubar,3)-2.414705e-1*Pow->powN(nubar,2)+1.007282*nubar-9.583769e-1;
96 pnu[4]=1.932275e-2*Pow->powN(nubar,3)-2.9 96 pnu[4]=1.932275e-2*Pow->powN(nubar,3)-2.923666e-1*Pow->powN(nubar,2)+1.421383*nubar-1.924025;
97 pnu[5]=-6.185679e-2*Pow->powN(nubar,3)+6. 97 pnu[5]=-6.185679e-2*Pow->powN(nubar,3)+6.82888e-1*Pow->powN(nubar,2)-2.347653*nubar+2.647049;
98 pnu[6]=1.79773e-2*Pow->powN(nubar,3)-1.60 98 pnu[6]=1.79773e-2*Pow->powN(nubar,3)-1.60516e-1*Pow->powN(nubar,2)+5.228077e-1*nubar-5.939556e-1;
99 pnu[7]=3.530038e-3*Pow->powN(nubar,4)-4.9 99 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;
100 pnu[8]=2.837523e-3*Pow->powN(nubar,3)-2.6 100 pnu[8]=2.837523e-3*Pow->powN(nubar,3)-2.678644e-2*Pow->powN(nubar,2)+8.545638e-2*nubar-9.156078e-2;
101 101
102 sum=pnu[0]+pnu[1]+pnu[2]+pnu[3]+pnu[4]+pn 102 sum=pnu[0]+pnu[1]+pnu[2]+pnu[3]+pnu[4]+pnu[5]+pnu[6]+pnu[7]+pnu[8];
103 103
104 pnu[0]=pnu[0]/sum; 104 pnu[0]=pnu[0]/sum;
105 pnu[1]=pnu[1]/sum; 105 pnu[1]=pnu[1]/sum;
106 pnu[2]=pnu[2]/sum; 106 pnu[2]=pnu[2]/sum;
107 pnu[3]=pnu[3]/sum; 107 pnu[3]=pnu[3]/sum;
108 pnu[4]=pnu[4]/sum; 108 pnu[4]=pnu[4]/sum;
109 pnu[5]=pnu[5]/sum; 109 pnu[5]=pnu[5]/sum;
110 pnu[6]=pnu[6]/sum; 110 pnu[6]=pnu[6]/sum;
111 pnu[7]=pnu[7]/sum; 111 pnu[7]=pnu[7]/sum;
112 pnu[8]=pnu[8]/sum; 112 pnu[8]=pnu[8]/sum;
113 113
114 r=fisslibrng(); 114 r=fisslibrng();
115 115
116 if(r <= pnu[0]) return 0; 116 if(r <= pnu[0]) return 0;
117 117
118 cpnu=pnu[0]+pnu[1]; 118 cpnu=pnu[0]+pnu[1];
119 if(r <= cpnu) return 1; 119 if(r <= cpnu) return 1;
120 120
121 cpnu=cpnu+pnu[2]; 121 cpnu=cpnu+pnu[2];
122 if(r <= cpnu) return 2; 122 if(r <= cpnu) return 2;
123 123
124 cpnu=cpnu+pnu[3]; 124 cpnu=cpnu+pnu[3];
125 if(r <= cpnu) return 3; 125 if(r <= cpnu) return 3;
126 126
127 cpnu=cpnu+pnu[4]; 127 cpnu=cpnu+pnu[4];
128 if(r <= cpnu) return 4; 128 if(r <= cpnu) return 4;
129 129
130 cpnu=cpnu+pnu[5]; 130 cpnu=cpnu+pnu[5];
131 if(r <= cpnu) return 5; 131 if(r <= cpnu) return 5;
132 132
133 cpnu=cpnu+pnu[6]; 133 cpnu=cpnu+pnu[6];
134 if(r <= cpnu) return 6; 134 if(r <= cpnu) return 6;
135 135
136 cpnu=cpnu+pnu[7]; 136 cpnu=cpnu+pnu[7];
137 if(r <= cpnu) return 7; 137 if(r <= cpnu) return 7;
138 else return 8; 138 else return 8;
139 139
140 } else { 140 } else {
141 /* 141 /*
142 Use Terrell's formula 142 Use Terrell's formula
143 */ 143 */
144 return (G4int) G4SmpTerrell(nubar); 144 return (G4int) G4SmpTerrell(nubar);
145 } 145 }
146 } 146 }
147 147