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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 // 56 //
57 57
58 #include "G4fissionEvent.hh" 58 #include "G4fissionEvent.hh"
59 59
60 #define nSPfissIso 8 60 #define nSPfissIso 8
61 #define nSPfissn 11 61 #define nSPfissn 11
62 62
63 G4int G4fissionEvent::G4SmpSpNuDistData(G4int 63 G4int G4fissionEvent::G4SmpSpNuDistData(G4int isotope, G4int Cf252option) {
64 64
65 /* 65 /*
66 Description 66 Description
67 Sample Number of Neutrons from spontaneous 67 Sample Number of Neutrons from spontaneous fission
68 (a) from the neutron multiplicity data for 68 (a) from the neutron multiplicity data for
69 U-238, Pu-238, Pu-240, Pu-242, Cm-242, 69 U-238, Pu-238, Pu-240, Pu-242, Cm-242, Cm-244
70 using Holden and Zucker's tabulated 70 using Holden and Zucker's tabulated data
71 Cf-252 using either Spencer's tabulate 71 Cf-252 using either Spencer's tabulated data or
72 Boldeman's data 72 Boldeman's data
73 (b) from Terrell's approximation using nub 73 (b) from Terrell's approximation using nubar for
74 Th-232, 74 Th-232,
75 U-232, U-233, U-234, U-235, U-236, 75 U-232, U-233, U-234, U-235, U-236,
76 Np-237, 76 Np-237,
77 Pu-239, Pu-241, 77 Pu-239, Pu-241,
78 Am-241, 78 Am-241,
79 Bk-249 79 Bk-249
80 using Ensslin's data. 80 using Ensslin's data.
81 */ 81 */
82 82
83 /* 83 /*
84 Input 84 Input
85 iso - isotope 85 iso - isotope
86 Cf252option - 0 to use Spencer's tabulate 86 Cf252option - 0 to use Spencer's tabulated data
87 1 to use Boldeman's data 87 1 to use Boldeman's data
88 Output 88 Output
89 G4SmpSpNuDistData - sampled multiplicity 89 G4SmpSpNuDistData - sampled multiplicity
90 -1 is the isotope has 90 -1 is the isotope has
91 no multiplicity data, 91 no multiplicity data,
92 nor any nubar data 92 nor any nubar data
93 */ 93 */
94 94
95 G4int i, index; 95 G4int i, index;
96 G4double sum, nubar; 96 G4double sum, nubar;
97 G4double r; 97 G4double r;
98 98
99 static G4double sfnu [nSPfissIso][nSPfissn] 99 static G4double sfnu [nSPfissIso][nSPfissn] = {
100 {0.0481677,0.2485215,0.4253044,0.2284094,0 100 {0.0481677,0.2485215,0.4253044,0.2284094,0.0423438,0.0072533,
101 0.0000000,0.0000000,0.0000000,0.0000000,0 101 0.0000000,0.0000000,0.0000000,0.0000000,0.0000000},
102 102
103 {0.0631852,0.2319644,0.3333230,0.2528207,0 103 {0.0631852,0.2319644,0.3333230,0.2528207,0.0986461,0.0180199,
104 0.0020407,0.0000000,0.0000000,0.0000000,0 104 0.0020407,0.0000000,0.0000000,0.0000000,0.0000000},
105 105
106 {0.0679423,0.2293159,0.3341228,0.2475507,0 106 {0.0679423,0.2293159,0.3341228,0.2475507,0.0996922,0.0182398,
107 0.0031364,0.0000000,0.0000000,0.0000000,0 107 0.0031364,0.0000000,0.0000000,0.0000000,0.0000000},
108 108
109 {0.0212550,0.1467407,0.3267531,0.3268277,0 109 {0.0212550,0.1467407,0.3267531,0.3268277,0.1375090,0.0373815,
110 0.0025912,0.0007551,0.0001867,0.0000000,0 110 0.0025912,0.0007551,0.0001867,0.0000000,0.0000000},
111 111
112 {0.0150050,0.1161725,0.2998427,0.3331614,0 112 {0.0150050,0.1161725,0.2998427,0.3331614,0.1837748,0.0429780,
113 0.0087914,0.0002744,0.0000000,0.0000000,0 113 0.0087914,0.0002744,0.0000000,0.0000000,0.0000000},
114 114
115 {0.0540647,0.2053880,0.3802279,0.2248483,0 115 {0.0540647,0.2053880,0.3802279,0.2248483,0.1078646,0.0276366,
116 0.0000000,0.0000000,0.0000000,0.0000000,0 116 0.0000000,0.0000000,0.0000000,0.0000000,0.0000000},
117 117
118 {0.0021100,0.0246700,0.1229000,0.2714400,0 118 {0.0021100,0.0246700,0.1229000,0.2714400,0.3076300,0.1877000,
119 0.0677000,0.0140600,0.0016700,0.0001000,0 119 0.0677000,0.0140600,0.0016700,0.0001000,0.0000000},
120 120
121 {0.0020900,0.0262100,0.1262000,0.2752000,0 121 {0.0020900,0.0262100,0.1262000,0.2752000,0.3018000,0.1846000,
122 0.0668000,0.0150000,0.0021000,0.0000000,0 122 0.0668000,0.0150000,0.0021000,0.0000000,0.0000000} };
123 123
124 /* 124 /*
125 sample the spontaneous fission neutron numbe 125 sample the spontaneous fission neutron number distribution
126 */ 126 */
127 index = -1; 127 index = -1;
128 128
129 if (isotope == 92238) index = 0; 129 if (isotope == 92238) index = 0;
130 else if (isotope == 94240) index = 1; 130 else if (isotope == 94240) index = 1;
131 else if (isotope == 94242) index = 2; 131 else if (isotope == 94242) index = 2;
132 else if (isotope == 96242) index = 3; 132 else if (isotope == 96242) index = 3;
133 else if (isotope == 96244) index = 4; 133 else if (isotope == 96244) index = 4;
134 else if (isotope == 94238) index = 5; 134 else if (isotope == 94238) index = 5;
135 else if (isotope == 98252 && Cf252option == 135 else if (isotope == 98252 && Cf252option == 0) index = 6;
136 else if (isotope == 98252 && Cf252option == 136 else if (isotope == 98252 && Cf252option == 1) index = 7;
137 137
138 if (index != -1) { 138 if (index != -1) {
139 r=fisslibrng(); 139 r=fisslibrng();
140 140
141 sum = 0.; 141 sum = 0.;
142 for (i = 0; i < nSPfissn-1; i++) { 142 for (i = 0; i < nSPfissn-1; i++) {
143 sum = sum + sfnu[index][i]; 143 sum = sum + sfnu[index][i];
144 if (r <= sum || sfnu[index][i+1] == 0.) 144 if (r <= sum || sfnu[index][i+1] == 0.) return i;
145 } 145 }
146 // 146 //
147 // Fall through 147 // Fall through
148 // 148 //
149 G4cout << " Random number out of range in 149 G4cout << " Random number out of range in SmpSpNuDistData " << G4endl;
150 return -1; 150 return -1;
151 151
152 } else { 152 } else {
153 // There is no full multiplicity distribution 153 // There is no full multiplicity distribution data available
154 // for that isotope, let's try to find a nubar 154 // for that isotope, let's try to find a nubar for it in
155 // N. Ensslin, et.al., "Application Guide to N 155 // N. Ensslin, et.al., "Application Guide to Neutron
156 // Multiplicity Counting," LA-13422-M (Novembe 156 // Multiplicity Counting," LA-13422-M (November 1998)
157 // and use Terrell's approximation 157 // and use Terrell's approximation
158 nubar = G4SmpSpNubarData(isotope); 158 nubar = G4SmpSpNubarData(isotope);
159 if (nubar != -1.) { 159 if (nubar != -1.) {
160 return (G4int) G4SmpTerrell(nubar); 160 return (G4int) G4SmpTerrell(nubar);
161 } else { 161 } else {
162 // There is no nubar information for that isot 162 // There is no nubar information for that isotope, return -1,
163 // meaning no data available for that isotope 163 // meaning no data available for that isotope
164 return -1; 164 return -1;
165 } 165 }
166 } 166 }
167 } 167 }
168 168