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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 // $Id: G4SmpNuDistDataU238.cc 67966 2013-03-13 09:38:38Z gcosmo $
56 // 57 //
57 58
58 #include <cmath> 59 #include <cmath>
59 #include "G4Pow.hh" 60 #include "G4Pow.hh"
60 #include "G4fissionEvent.hh" 61 #include "G4fissionEvent.hh"
61 62
62 G4int G4fissionEvent::G4SmpNuDistDataU238(G4do 63 G4int G4fissionEvent::G4SmpNuDistDataU238(G4double erg) {
63 64
64 /* 65 /*
65 Description 66 Description
66 Sample Number of Neutrons from fission in 67 Sample Number of Neutrons from fission in U-238 using
67 Zucker and Holden's tabulated data for U 68 Zucker and Holden's tabulated data for U-238
68 */ 69 */
69 70
70 /* 71 /*
71 Input 72 Input
72 erg - incident neutron energy 73 erg - incident neutron energy
73 Output 74 Output
74 G4SmpNuDistDataU238 - sampled multiplicit 75 G4SmpNuDistDataU238 - sampled multiplicity
75 76
76 */ 77 */
77 78
78 G4double cpnu; 79 G4double cpnu;
79 G4double pnu[] = {0.0, 0.0, 0.0, 0.0, 0.0, 0 80 G4double pnu[] = {0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0};
80 G4double eng; 81 G4double eng;
81 G4double r; 82 G4double r;
82 83
83 /* 84 /*
84 Check if energy is within the range of exper 85 Check if energy is within the range of experimental values
85 */ 86 */
86 if (erg > 10) eng=10.; 87 if (erg > 10) eng=10.;
87 else eng=erg; 88 else eng=erg;
88 89
89 r=fisslibrng(); 90 r=fisslibrng();
90 /* 91 /*
91 U-238 nu distribution 92 U-238 nu distribution
92 */ 93 */
93 G4Pow* Pow=G4Pow::GetInstance(); 94 G4Pow* Pow=G4Pow::GetInstance();
94 if (eng <= 5.0) pnu[0]=0.0396484e0-1.14202e- 95 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 96 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; 97 if (r <= pnu[0]) return 0;
97 98
98 if (eng <= 5.0) pnu[1]=0.252954e0-5.17151e-2 99 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- 100 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]; 101 cpnu=pnu[0]+pnu[1];
101 if (r <= cpnu) return 1; 102 if (r <= cpnu) return 1;
102 103
103 pnu[2]=0.29395353e0+0.01098908e0*eng-0.00565 104 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]; 105 cpnu=cpnu+pnu[2];
105 if (r <= cpnu) return 2; 106 if (r <= cpnu) return 2;
106 107
107 if (eng <= 5.0) pnu[3]=0.264447e0+3.02825e-2 108 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+ 109 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]; 110 cpnu=cpnu+pnu[3];
110 if (r <= cpnu) return 3; 111 if (r <= cpnu) return 3;
111 112
112 if (eng <= 5) pnu[4]=0.111176e0+1.66321e-2*e 113 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+ 114 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]; 115 cpnu=cpnu+pnu[4];
115 if (r <= cpnu) return 4; 116 if (r <= cpnu) return 4;
116 117
117 if (eng <= 5.0) pnu[5]=0.0312261e0+4.12932e- 118 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 119 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]; 120 cpnu=cpnu+pnu[5];
120 if (r <= cpnu) return 5; 121 if (r <= cpnu) return 5;
121 122
122 if (eng <= 5.0) pnu[6]=5.9347e-3+9.80023e-4* 123 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+3 124 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]; 125 cpnu=cpnu+pnu[6];
125 if (r <= cpnu) return 6; 126 if (r <= cpnu) return 6;
126 127
127 if (eng <= 5.0) pnu[7]=5.436e-4+1.3756e-4*en 128 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. 129 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]; 130 cpnu=cpnu+pnu[7];
130 if (r <= cpnu) return 7; 131 if (r <= cpnu) return 7;
131 else return 8; 132 else return 8;
132 } 133 }
133 134