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27 // This software was developed by Lawrence Liv 27 // This software was developed by Lawrence Livermore National Laboratory.
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50 // 50 //
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::G4SmpNuDistDataU238(G4do 62 G4int G4fissionEvent::G4SmpNuDistDataU238(G4double erg) {
63 63
64 /* 64 /*
65 Description 65 Description
66 Sample Number of Neutrons from fission in 66 Sample Number of Neutrons from fission in U-238 using
67 Zucker and Holden's tabulated data for U 67 Zucker and Holden's tabulated data for U-238
68 */ 68 */
69 69
70 /* 70 /*
71 Input 71 Input
72 erg - incident neutron energy 72 erg - incident neutron energy
73 Output 73 Output
74 G4SmpNuDistDataU238 - sampled multiplicit 74 G4SmpNuDistDataU238 - sampled multiplicity
75 75
76 */ 76 */
77 77
78 G4double cpnu; 78 G4double cpnu;
79 G4double pnu[] = {0.0, 0.0, 0.0, 0.0, 0.0, 0 79 G4double pnu[] = {0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0};
80 G4double eng; 80 G4double eng;
81 G4double r; 81 G4double r;
82 82
83 /* 83 /*
84 Check if energy is within the range of exper 84 Check if energy is within the range of experimental values
85 */ 85 */
86 if (erg > 10) eng=10.; 86 if (erg > 10) eng=10.;
87 else eng=erg; 87 else eng=erg;
88 88
89 r=fisslibrng(); 89 r=fisslibrng();
90 /* 90 /*
91 U-238 nu distribution 91 U-238 nu distribution
92 */ 92 */
93 G4Pow* Pow=G4Pow::GetInstance(); 93 G4Pow* Pow=G4Pow::GetInstance();
94 if (eng <= 5.0) pnu[0]=0.0396484e0-1.14202e- 94 if (eng <= 5.0) pnu[0]=0.0396484e0-1.14202e-2*eng+1.94627e-3*Pow->powN(eng,2)-2.95412e-4*Pow->powN(eng,3)+2.98333e-5*Pow->powN(eng,4)-1.31417e-6*Pow->powN(eng,5);
95 if (eng > 5 && eng <= 10) pnu[0]=0.0360013e0 95 if (eng > 5 && eng <= 10) pnu[0]=0.0360013e0-8.06662e-3*eng+6.59461e-4*Pow->powN(eng,2)-3.54123e-5*Pow->powN(eng,3)+2.03749e-6*Pow->powN(eng,4)-5.91663e-8*Pow->powN(eng,5);
96 if (r <= pnu[0]) return 0; 96 if (r <= pnu[0]) return 0;
97 97
98 if (eng <= 5.0) pnu[1]=0.252954e0-5.17151e-2 98 if (eng <= 5.0) pnu[1]=0.252954e0-5.17151e-2*eng+2.84558e-3*Pow->powN(eng,2)+2.93563e-4*Pow->powN(eng,3)-5.99833e-5*Pow->powN(eng,4)+3.34417e-6*Pow->powN(eng,5);
99 if (eng > 5 && eng <= 10) pnu[1]=0.259093e0- 99 if (eng > 5 && eng <= 10) pnu[1]=0.259093e0-5.7936e-2*eng+5.50734e-3*Pow->powN(eng,2)-3.09607e-4*Pow->powN(eng,3)+1.20957e-5*Pow->powN(eng,4)-2.49997e-7*Pow->powN(eng,5);
100 cpnu=pnu[0]+pnu[1]; 100 cpnu=pnu[0]+pnu[1];
101 if (r <= cpnu) return 1; 101 if (r <= cpnu) return 1;
102 102
103 pnu[2]=0.29395353e0+0.01098908e0*eng-0.00565 103 pnu[2]=0.29395353e0+0.01098908e0*eng-0.00565976e0*Pow->powN(eng,2)+3.14515399e-4*Pow->powN(eng,3)-5.66793415e-6*Pow->powN(eng,4)+1.54070513e-7*Pow->powN(eng,5);
104 cpnu=cpnu+pnu[2]; 104 cpnu=cpnu+pnu[2];
105 if (r <= cpnu) return 2; 105 if (r <= cpnu) return 2;
106 106
107 if (eng <= 5.0) pnu[3]=0.264447e0+3.02825e-2 107 if (eng <= 5.0) pnu[3]=0.264447e0+3.02825e-2*eng-3.12762e-3*Pow->powN(eng,2)-1.5875e-4*Pow->powN(eng,3)+4.91667e-5*Pow->powN(eng,4)-3.38667e-6*Pow->powN(eng,5);
108 if (eng > 5 && eng <= 10) pnu[3]=0.262024e0+ 108 if (eng > 5 && eng <= 10) pnu[3]=0.262024e0+3.37134e-2*eng-5.01711e-3*Pow->powN(eng,2)+3.58761e-4*Pow->powN(eng,3)-2.17959e-5*Pow->powN(eng,4)+5.10834e-7*Pow->powN(eng,5);
109 cpnu=cpnu+pnu[3]; 109 cpnu=cpnu+pnu[3];
110 if (r <= cpnu) return 3; 110 if (r <= cpnu) return 3;
111 111
112 if (eng <= 5) pnu[4]=0.111176e0+1.66321e-2*e 112 if (eng <= 5) pnu[4]=0.111176e0+1.66321e-2*eng+2.56307e-3*Pow->powN(eng,2)-2.17754e-4*Pow->powN(eng,3)-5.96667e-6*Pow->powN(eng,4)+7.44167e-7*Pow->powN(eng,5);
113 if (eng > 5 && eng <= 10) pnu[4]=0.107859e0+ 113 if (eng > 5 && eng <= 10) pnu[4]=0.107859e0+1.88862e-2*eng+2.07521e-3*Pow->powN(eng,2)-2.08099e-4*Pow->powN(eng,3)+3.23745e-6*Pow->powN(eng,4)-1.24999e-7*Pow->powN(eng,5);
114 cpnu=cpnu+pnu[4]; 114 cpnu=cpnu+pnu[4];
115 if (r <= cpnu) return 4; 115 if (r <= cpnu) return 4;
116 116
117 if (eng <= 5.0) pnu[5]=0.0312261e0+4.12932e- 117 if (eng <= 5.0) pnu[5]=0.0312261e0+4.12932e-3*eng+9.18413e-4*Pow->powN(eng,2)+4.36542e-5*Pow->powN(eng,3)-5.9125e-6*Pow->powN(eng,4)+3.20833e-7*Pow->powN(eng,5);
118 if (eng > 5 && eng <= 10) pnu[5]=0.0324008e0 118 if (eng > 5 && eng <= 10) pnu[5]=0.0324008e0+3.04772e-3*eng+1.3327e-3*Pow->powN(eng,2)-3.96916e-5*Pow->powN(eng,3)+2.94583e-6*Pow->powN(eng,4)-7.66666e-8*Pow->powN(eng,5);
119 cpnu=cpnu+pnu[5]; 119 cpnu=cpnu+pnu[5];
120 if (r <= cpnu) return 5; 120 if (r <= cpnu) return 5;
121 121
122 if (eng <= 5.0) pnu[6]=5.9347e-3+9.80023e-4* 122 if (eng <= 5.0) pnu[6]=5.9347e-3+9.80023e-4*eng+4.24667e-4*Pow->powN(eng,2)+3.04458e-5*Pow->powN(eng,3)-6.46667e-6*Pow->powN(eng,4)+4.30833e-7*Pow->powN(eng,5);
123 if (eng > 5 && eng <= 10) pnu[6]=6.5421e-3+3 123 if (eng > 5 && eng <= 10) pnu[6]=6.5421e-3+3.07834e-4*eng+7.39454e-4*Pow->powN(eng,2)-4.70459e-5*Pow->powN(eng,3)+3.44583e-6*Pow->powN(eng,4)-8.91667e-8*Pow->powN(eng,5);
124 cpnu=cpnu+pnu[6]; 124 cpnu=cpnu+pnu[6];
125 if (r <= cpnu) return 6; 125 if (r <= cpnu) return 6;
126 126
127 if (eng <= 5.0) pnu[7]=5.436e-4+1.3756e-4*en 127 if (eng <= 5.0) pnu[7]=5.436e-4+1.3756e-4*eng-5.0e-7*Pow->powN(eng,2)+1.35917e-5*Pow->powN(eng,3)+5.0e-7*Pow->powN(eng,4)-5.16667e-8*Pow->powN(eng,5);
128 if (eng > 5 && eng <= 10) pnu[7]=9.212e-4-1. 128 if (eng > 5 && eng <= 10) pnu[7]=9.212e-4-1.57585e-4*eng+8.41126e-5*Pow->powN(eng,2)+4.14166e-6*Pow->powN(eng,3)+5.37501e-7*Pow->powN(eng,4)-6.66668e-9*Pow->powN(eng,5);
129 cpnu=cpnu+pnu[7]; 129 cpnu=cpnu+pnu[7];
130 if (r <= cpnu) return 7; 130 if (r <= cpnu) return 7;
131 else return 8; 131 else return 8;
132 } 132 }
133 133