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53 // UCRL-CODE-224807 53 // UCRL-CODE-224807
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>> 56 // $Id: G4SmpNuDistDataPu239_241_MC.cc 68799 2013-04-05 13:29:46Z gcosmo $
56 // 57 //
57 58
58 #include <cmath> 59 #include <cmath>
59 #include "G4fissionEvent.hh" 60 #include "G4fissionEvent.hh"
60 61
61 G4int G4fissionEvent::G4SmpNuDistDataPu239_241 62 G4int G4fissionEvent::G4SmpNuDistDataPu239_241_MC(G4double nubar) {
62 63
63 /* 64 /*
64 Description 65 Description
65 Sample Number of Neutrons from fission in 66 Sample Number of Neutrons from fission in Pu-239 and Pu-241 using
66 Zucker and Holden's tabulated data for Pu- 67 Zucker and Holden's tabulated data for Pu-239
67 The 11 P(nu) distributions are given as a 68 The 11 P(nu) distributions are given as a function of nubar,
68 the average number of neutrons from induce 69 the average number of neutrons from induced fission for the
69 11 different energies (0 to 10 MeV), based 70 11 different energies (0 to 10 MeV), based on the Pu-239 data
70 from Zucker and Holden. 71 from Zucker and Holden.
71 */ 72 */
72 73
73 /* 74 /*
74 Input 75 Input
75 nubar - average number of neutrons per 76 nubar - average number of neutrons per fission
76 Output 77 Output
77 G4SmpNuDistDataPu239_241_MC - sampled mul 78 G4SmpNuDistDataPu239_241_MC - sampled multiplicity
78 79
79 */ 80 */
80 81
81 static G4double Pu239nu [11] [9] = { 82 static G4double Pu239nu [11] [9] = {
82 {.0108826, .0994916, .2748898, .3269196, 83 {.0108826, .0994916, .2748898, .3269196, .2046061, .0726834, .0097282, .0006301, .0001685},
83 {.0084842, .0790030, .2536175, .3289870, 84 {.0084842, .0790030, .2536175, .3289870, .2328111, .0800161, .0155581, .0011760, .0003469},
84 {.0062555, .0611921, .2265608, .3260637, 85 {.0062555, .0611921, .2265608, .3260637, .2588354, .0956070, .0224705, .0025946, .0005205},
85 {.0045860, .0477879, .1983002, .3184667, 86 {.0045860, .0477879, .1983002, .3184667, .2792811, .1158950, .0301128, .0048471, .0007233},
86 {.0032908, .0374390, .1704196, .3071862, 87 {.0032908, .0374390, .1704196, .3071862, .2948565, .1392594, .0386738, .0078701, .0010046},
87 {.0022750, .0291416, .1437645, .2928006, 88 {.0022750, .0291416, .1437645, .2928006, .3063902, .1641647, .0484343, .0116151, .0014149},
88 {.0014893, .0222369, .1190439, .2756297, 89 {.0014893, .0222369, .1190439, .2756297, .3144908, .1892897, .0597353, .0160828, .0029917},
89 {.0009061, .0163528, .0968110, .2558524, 90 {.0009061, .0163528, .0968110, .2558524, .3194566, .2134888, .0729739, .0213339, .0020017},
90 {.0004647, .0113283, .0775201, .2335926, 91 {.0004647, .0113283, .0775201, .2335926, .3213289, .2356614, .0886183, .0274895, .0039531},
91 {.0002800, .0071460, .0615577, .2089810, 92 {.0002800, .0071460, .0615577, .2089810, .3200121, .2545846, .1072344, .0347255, .0054786},
92 {.0002064, .0038856, .0492548, .1822078, 93 {.0002064, .0038856, .0492548, .1822078, .3154159, .2687282, .1295143, .0432654, .0075217}
93 }; 94 };
94 static G4double Pu239nubar [11] = { 95 static G4double Pu239nubar [11] = {
95 2.8760000, 96 2.8760000,
96 3.0088800, 97 3.0088800,
97 3.1628300, 98 3.1628300,
98 3.3167800, 99 3.3167800,
99 3.4707300, 100 3.4707300,
100 3.6246800, 101 3.6246800,
101 3.7786300, 102 3.7786300,
102 3.9325800, 103 3.9325800,
103 4.0865300, 104 4.0865300,
104 4.2404900, 105 4.2404900,
105 4.3944400 106 4.3944400
106 }; 107 };
107 G4double fraction, r, cum; 108 G4double fraction, r, cum;
108 G4int engind, nu; 109 G4int engind, nu;
109 110
110 /* 111 /*
111 Check if nubar is within the range of experi 112 Check if nubar is within the range of experimental values
112 */ 113 */
113 if(nubar >= Pu239nubar[0] && nubar <= Pu239n 114 if(nubar >= Pu239nubar[0] && nubar <= Pu239nubar[10]) {
114 /* 115 /*
115 Use Zucker and Holden Data 116 Use Zucker and Holden Data
116 */ 117 */
117 engind = 1; 118 engind = 1;
118 while (nubar > Pu239nubar[engind]){ engin 119 while (nubar > Pu239nubar[engind]){ engind++;}
119 // Loop checking, 11.03.2015, T. Koi 120 // Loop checking, 11.03.2015, T. Koi
120 fraction = (nubar-Pu239nubar[engind-1])/( 121 fraction = (nubar-Pu239nubar[engind-1])/(Pu239nubar[engind]-Pu239nubar[engind-1]);
121 if(fisslibrng() > fraction) engind--; 122 if(fisslibrng() > fraction) engind--;
122 123
123 r = fisslibrng(); 124 r = fisslibrng();
124 nu = 0; 125 nu = 0;
125 cum = Pu239nu[engind][0]; 126 cum = Pu239nu[engind][0];
126 while (r > cum && nu < 8){ 127 while (r > cum && nu < 8){
127 // Loop checking, 11.03.2015, T. Koi 128 // Loop checking, 11.03.2015, T. Koi
128 nu++; 129 nu++;
129 cum += Pu239nu[engind][nu]; 130 cum += Pu239nu[engind][nu];
130 } 131 }
131 return nu; 132 return nu;
132 } else { 133 } else {
133 /* 134 /*
134 Use Terrell's formula 135 Use Terrell's formula
135 */ 136 */
136 return (G4int) G4SmpTerrell(nubar); 137 return (G4int) G4SmpTerrell(nubar);
137 } 138 }
138 } 139 }
139 140