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53 // UCRL-CODE-224807 53 // UCRL-CODE-224807
54 // 54 //
55 // 55 //
>> 56 // $Id: G4SmpNuDistDataU233_235_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::G4SmpNuDistDataU233_235_ 62 G4int G4fissionEvent::G4SmpNuDistDataU233_235_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 U-233 and U-235 using
66 Zucker and Holden's tabulated data for U-2 67 Zucker and Holden's tabulated data for U-235
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 U-235 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 G4SmpNuDistDataU233_235_MC - sampled mult 78 G4SmpNuDistDataU233_235_MC - sampled multiplicity
78 79
79 */ 80 */
80 81
81 static G4double U235nu [11] [8] = { 82 static G4double U235nu [11] [8] = {
82 {.0317223, .1717071, .3361991, .3039695, 83 {.0317223, .1717071, .3361991, .3039695, .1269459, .0266793, .0026322, .0001449},
83 {.0237898, .1555525, .3216515, .3150433, 84 {.0237898, .1555525, .3216515, .3150433, .1444732, .0356013, .0034339, .0004546},
84 {.0183989, .1384891, .3062123, .3217566, 85 {.0183989, .1384891, .3062123, .3217566, .1628673, .0455972, .0055694, .0011093},
85 {.0141460, .1194839, .2883075, .3266568, 86 {.0141460, .1194839, .2883075, .3266568, .1836014, .0569113, .0089426, .0019504},
86 {.0115208, .1032624, .2716849, .3283426, 87 {.0115208, .1032624, .2716849, .3283426, .2021206, .0674456, .0128924, .0027307},
87 {.0078498, .0802010, .2456595, .3308175, 88 {.0078498, .0802010, .2456595, .3308175, .2291646, .0836912, .0187016, .0039148},
88 {.0046272, .0563321, .2132296, .3290407, 89 {.0046272, .0563321, .2132296, .3290407, .2599806, .1045974, .0265604, .0056322},
89 {.0024659, .0360957, .1788634, .3210507, 90 {.0024659, .0360957, .1788634, .3210507, .2892537, .1282576, .0360887, .0079244},
90 {.0012702, .0216090, .1472227, .3083032, 91 {.0012702, .0216090, .1472227, .3083032, .3123950, .1522540, .0462449, .0107009},
91 {.0007288, .0134879, .1231200, .2949390, 92 {.0007288, .0134879, .1231200, .2949390, .3258251, .1731879, .0551737, .0135376},
92 {.0004373, .0080115, .1002329, .2779283, 93 {.0004373, .0080115, .1002329, .2779283, .3342611, .1966100, .0650090, .0175099}
93 }; 94 };
94 static G4double U235nubar [11] = { 95 static G4double U235nubar [11] = {
95 2.4140000, 96 2.4140000,
96 2.5236700, 97 2.5236700,
97 2.6368200, 98 2.6368200,
98 2.7623400, 99 2.7623400,
99 2.8738400, 100 2.8738400,
100 3.0386999, 101 3.0386999,
101 3.2316099, 102 3.2316099,
102 3.4272800, 103 3.4272800,
103 3.6041900, 104 3.6041900,
104 3.7395900, 105 3.7395900,
105 3.8749800 106 3.8749800
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 >= U235nubar[0] && nubar <= U235nub 114 if(nubar >= U235nubar[0] && nubar <= U235nubar[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 > U235nubar[engind]){ engind 119 while (nubar > U235nubar[engind]){ engind++;}
119 // Loop checking, 11.03.2015, T. Koi <<
120 fraction = (nubar-U235nubar[engind-1])/(U 120 fraction = (nubar-U235nubar[engind-1])/(U235nubar[engind]-U235nubar[engind-1]);
121 if(fisslibrng() > fraction) engind--; 121 if(fisslibrng() > fraction) engind--;
122 122
123 r = fisslibrng(); 123 r = fisslibrng();
124 nu = 0; 124 nu = 0;
125 cum = U235nu[engind][0]; 125 cum = U235nu[engind][0];
126 while (r > cum && nu < 7){ 126 while (r > cum && nu < 7){
127 // Loop checking, 11.03.2015, T. Koi <<
128 nu++; 127 nu++;
129 cum += U235nu[engind][nu]; 128 cum += U235nu[engind][nu];
130 } 129 }
131 return nu; 130 return nu;
132 } else { 131 } else {
133 /* 132 /*
134 Use Terrell's formula 133 Use Terrell's formula
135 */ 134 */
136 return (G4int) G4SmpTerrell(nubar); 135 return (G4int) G4SmpTerrell(nubar);
137 } 136 }
138 } 137 }
139 138