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53 // UCRL-CODE-224807 53 // UCRL-CODE-224807
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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 "G4Exp.hh"
61 #include "G4Pow.hh" 62 #include "G4Pow.hh"
62 63
63 int G4fissionEvent::G4SmpNuDistDataU233_235(G4 64 int G4fissionEvent::G4SmpNuDistDataU233_235(G4double nubar) {
64 65
65 G4Pow* Pow = G4Pow::GetInstance(); 66 G4Pow* Pow = G4Pow::GetInstance();
66 /* 67 /*
67 Description 68 Description
68 Sample Number of Neutrons from fission in 69 Sample Number of Neutrons from fission in U-233 and U-235 using
69 Zucker and Holden's tabulated data for U-2 70 Zucker and Holden's tabulated data for U-235
70 The P(nu) distribution is given as a funct 71 The P(nu) distribution is given as a function of the average
71 number of neutrons from fission, based on 72 number of neutrons from fission, based on interpolation of the
72 U-235 data from Zucker and Holden. 73 U-235 data from Zucker and Holden.
73 */ 74 */
74 75
75 /* 76 /*
76 Input 77 Input
77 nubar - average number of neutrons per 78 nubar - average number of neutrons per fission
78 Output 79 Output
79 G4SmpNuDistDataU233_235 - sampled multipl 80 G4SmpNuDistDataU233_235 - sampled multiplicity
80 81
81 */ 82 */
82 83
83 G4double pnu[8], cpnu, sum; 84 G4double pnu[8], cpnu, sum;
84 G4double r; 85 G4double r;
85 86
86 /* 87 /*
87 Check if nubar is within the range of experi 88 Check if nubar is within the range of experimental values
88 */ 89 */
89 if(nubar >= 2.25 && nubar <= 4.0) { 90 if(nubar >= 2.25 && nubar <= 4.0) {
90 /* 91 /*
91 Use Zucker and Holden Data 92 Use Zucker and Holden Data
92 */ 93 */
93 if(nubar <= 2.8738) pnu[0]=-9.279554e-02* 94 if(nubar <= 2.8738) pnu[0]=-9.279554e-02*Pow->powN(nubar,3)+8.036687e-01*Pow->powN(nubar,2)-2.342684*nubar+2.309035;
94 else if(nubar > 2.8738 && nubar <= 3.4272 95 else if(nubar > 2.8738 && nubar <= 3.4272) pnu[0]=1.50072e-2*Pow->powN(nubar,2)-1.109109e-1*nubar+2.063133e-1;
95 else pnu[0]=1.498897e+3*G4Exp(-3.883864*n 96 else pnu[0]=1.498897e+3*G4Exp(-3.883864*nubar);
96 97
97 if(nubar <= 3.2316) pnu[1]=3.531126e-2*Po 98 if(nubar <= 3.2316) pnu[1]=3.531126e-2*Pow->powN(nubar,3)-2.787213e-1*Pow->powN(nubar,2)+5.824072e-1*nubar-1.067136e-1;
98 else pnu[1]=6.574492e-2*Pow->powN(nubar,2 99 else pnu[1]=6.574492e-2*Pow->powN(nubar,2)-5.425741e-1*nubar+1.123199;
99 100
100 pnu[2]=1.274643e-2*Pow->powN(nubar,3)-1.3 101 pnu[2]=1.274643e-2*Pow->powN(nubar,3)-1.387954e-1*Pow->powN(nubar,2)+3.264669e-1*nubar+1.77148e-1;
101 102
102 pnu[3]=5.473738e-2*Pow->powN(nubar,5)-8.8 103 pnu[3]=5.473738e-2*Pow->powN(nubar,5)-8.835826e-1*Pow->powN(nubar,4)+5.657201*Pow->powN(nubar,3)-1.802669e+1*Pow->powN(nubar,2)+2.867937e+1*nubar-1.794296e+1;
103 104
104 pnu[4]=-3.591076e-2*Pow->powN(nubar,3)+3. 105 pnu[4]=-3.591076e-2*Pow->powN(nubar,3)+3.092624e-1*Pow->powN(nubar,2)-7.184805e-1*nubar+5.649400e-1;
105 106
106 if(nubar <= 2.8738) pnu[5]=1.699374e-2*Po 107 if(nubar <= 2.8738) pnu[5]=1.699374e-2*Pow->powN(nubar,2)-1.069558e-3*nubar-6.981430e-2;
107 else pnu[5]=2.100175e-2*Pow->powN(nubar,3 108 else pnu[5]=2.100175e-2*Pow->powN(nubar,3)-1.705788e-1*Pow->powN(nubar,2)+5.575467e-1*nubar-6.245873e-1;
108 109
109 if(nubar <= 3.0387) pnu[6]=9.431919e-7*Po 110 if(nubar <= 3.0387) pnu[6]=9.431919e-7*Pow->powA(nubar,8.958848);
110 else pnu[6]=4.322428e-3*Pow->powN(nubar,3 111 else pnu[6]=4.322428e-3*Pow->powN(nubar,3)-2.094790e-2*Pow->powN(nubar,2)+4.449671e-2*nubar-4.435987e-2;
111 112
112 pnu[7]=5.689084e-3*Pow->powN(nubar,4)-6.5 113 pnu[7]=5.689084e-3*Pow->powN(nubar,4)-6.591895e-2*Pow->powN(nubar,3)+2.886861e-1*Pow->powN(nubar,2)-5.588146e-1*nubar+4.009166e-1;
113 114
114 sum=pnu[0]+pnu[1]+pnu[2]+pnu[3]+pnu[4]+pn 115 sum=pnu[0]+pnu[1]+pnu[2]+pnu[3]+pnu[4]+pnu[5]+pnu[6]+pnu[7];
115 116
116 pnu[0]=pnu[0]/sum; 117 pnu[0]=pnu[0]/sum;
117 pnu[1]=pnu[1]/sum; 118 pnu[1]=pnu[1]/sum;
118 pnu[2]=pnu[2]/sum; 119 pnu[2]=pnu[2]/sum;
119 pnu[3]=pnu[3]/sum; 120 pnu[3]=pnu[3]/sum;
120 pnu[4]=pnu[4]/sum; 121 pnu[4]=pnu[4]/sum;
121 pnu[5]=pnu[5]/sum; 122 pnu[5]=pnu[5]/sum;
122 pnu[6]=pnu[6]/sum; 123 pnu[6]=pnu[6]/sum;
123 pnu[7]=pnu[7]/sum; 124 pnu[7]=pnu[7]/sum;
124 125
125 r=fisslibrng(); 126 r=fisslibrng();
126 127
127 if(r <= pnu[0]) return (int) 0; 128 if(r <= pnu[0]) return (int) 0;
128 129
129 cpnu=pnu[0]+pnu[1]; 130 cpnu=pnu[0]+pnu[1];
130 if(r <= cpnu) return (int) 1; 131 if(r <= cpnu) return (int) 1;
131 132
132 cpnu=cpnu+pnu[2]; 133 cpnu=cpnu+pnu[2];
133 if(r <= cpnu) return (int) 2; 134 if(r <= cpnu) return (int) 2;
134 135
135 cpnu=cpnu+pnu[3]; 136 cpnu=cpnu+pnu[3];
136 if(r <= cpnu) return (int) 3; 137 if(r <= cpnu) return (int) 3;
137 138
138 cpnu=cpnu+pnu[4]; 139 cpnu=cpnu+pnu[4];
139 if(r <= cpnu) return (int) 4; 140 if(r <= cpnu) return (int) 4;
140 141
141 cpnu=cpnu+pnu[5]; 142 cpnu=cpnu+pnu[5];
142 if(r <= cpnu) return (int) 5; 143 if(r <= cpnu) return (int) 5;
143 144
144 cpnu=cpnu+pnu[6]; 145 cpnu=cpnu+pnu[6];
145 if(r <= cpnu) return (int) 6; 146 if(r <= cpnu) return (int) 6;
146 else return (int) 7; 147 else return (int) 7;
147 } else { 148 } else {
148 /* 149 /*
149 Use Terrell's formula 150 Use Terrell's formula
150 */ 151 */
151 return (int) G4SmpTerrell(nubar); 152 return (int) G4SmpTerrell(nubar);
152 } 153 }
153 } 154 }
154 155