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51 // Copyright (c) 2006 The Regents of the University of California.
52 // All rights reserved.
53 // UCRL-CODE-224807
54 //
55 //
56 //
57
58 #include <cmath>
59 #include "G4fissionEvent.hh"
60
61 G4int G4fissionEvent::G4SmpNuDistDataU232_234_236_238_MC(G4double nubar) {
62
63 /*
64 Description
65 Sample Number of Neutrons from fission in U-232, U-234, U-236,
66 and U-238 using Zucker and Holden's tabulated data for U-238
67 The 11 P(nu) distributions are given as a function of nubar,
68 the average number of neutrons from induced fission for the
69 11 different energies (0 to 10 MeV), based on the U-238 data
70 from Zucker and Holden.
71 */
72
73 /*
74 Input
75 nubar - average number of neutrons per fission
76 Output
77 G4SmpNuDistDataU232_234_236_238_MC - sampled multiplicity
78
79 */
80
81 static G4double U238nu [11] [9] = {
82 {.0396484, .2529541, .2939544, .2644470, .1111758, .0312261, .0059347, .0005436, .0001158},
83 {.0299076, .2043215, .2995886, .2914889, .1301480, .0363119, .0073638, .0006947, .0001751},
84 {.0226651, .1624020, .2957263, .3119098, .1528786, .0434233, .0097473, .0009318, .0003159},
85 {.0170253, .1272992, .2840540, .3260192, .1779579, .0526575, .0130997, .0013467, .0005405},
86 {.0124932, .0984797, .2661875, .3344938, .2040116, .0640468, .0173837, .0020308, .0008730},
87 {.0088167, .0751744, .2436570, .3379711, .2297901, .0775971, .0225619, .0030689, .0013626},
88 {.0058736, .0565985, .2179252, .3368863, .2541575, .0933127, .0286200, .0045431, .0031316},
89 {.0035997, .0420460, .1904095, .3314575, .2760413, .1112075, .0355683, .0065387, .0031316},
90 {.0019495, .0309087, .1625055, .3217392, .2943792, .1313074, .0434347, .0091474, .0046284},
91 {.0008767, .0226587, .1356058, .3076919, .3080816, .1536446, .0522549, .0124682, .0067176},
92 {.0003271, .0168184, .1111114, .2892434, .3160166, .1782484, .0620617, .0166066, .0095665}
93 };
94 static G4double U238nubar [11] = {
95 2.2753781,
96 2.4305631,
97 2.5857481,
98 2.7409331,
99 2.8961181,
100 3.0513031,
101 3.2064881,
102 3.3616731,
103 3.5168581,
104 3.6720432,
105 3.8272281
106 };
107 G4double fraction, r, cum;
108 G4int engind, nu;
109
110 /*
111 Check if nubar is within the range of experimental values
112 */
113 if(nubar >= U238nubar[0] && nubar <= U238nubar[10]) {
114 /*
115 Use Zucker and Holden Data
116 */
117 engind = 1;
118 while (nubar > U238nubar[engind]){ engind++;}
119 // Loop checking, 11.03.2015, T. Koi
120 fraction = (nubar-U238nubar[engind-1])/(U238nubar[engind]-U238nubar[engind-1]);
121 if(fisslibrng() > fraction) engind--;
122
123 r = fisslibrng();
124 nu = 0;
125 cum = U238nu[engind][0];
126 while (r > cum && nu < 8){
127 // Loop checking, 11.03.2015, T. Koi
128 nu++;
129 cum += U238nu[engind][nu];
130 }
131 return nu;
132 } else {
133 /*
134 Use Terrell's formula
135 */
136 return (G4int) G4SmpTerrell(nubar);
137 }
138 }
139