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27 | // This software was developed by Lawrence Livermore National Laboratory. |
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30 | // modification, are permitted provided that the following conditions are met: |
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38 | // derived from this software without specific prior written permission. |
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40 | // THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
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41 | // WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
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48 | // OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
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49 | // ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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50 | // |
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51 | // Copyright (c) 2006 The Regents of the University of California. |
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52 | // All rights reserved. |
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53 | // UCRL-CODE-224807 |
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54 | // |
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55 | // |
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56 | // $Id: G4SmpSpNuDistData.cc,v 1.2 2007/05/30 19:01:32 dennis Exp $ |
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57 | // |
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58 | |
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59 | #include "G4fissionEvent.hh" |
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60 | |
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61 | #define nSPfissIso 8 |
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62 | #define nSPfissn 11 |
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63 | |
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64 | G4int G4fissionEvent::G4SmpSpNuDistData(G4int isotope, G4int Cf252option) { |
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65 | |
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66 | /* |
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67 | Description |
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68 | Sample Number of Neutrons from spontaneous fission |
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69 | (a) from the neutron multiplicity data for |
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70 | U-238, Pu-238, Pu-240, Pu-242, Cm-242, Cm-244 |
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71 | using Holden and Zucker's tabulated data |
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72 | Cf-252 using either Spencer's tabulated data or |
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73 | Boldeman's data |
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74 | (b) from Terrell's approximation using nubar for |
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75 | Th-232, |
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76 | U-232, U-233, U-234, U-235, U-236, |
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77 | Np-237, |
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78 | Pu-239, Pu-241, |
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79 | Am-241, |
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80 | Bk-249 |
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81 | using Ensslin's data. |
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82 | */ |
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83 | |
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84 | /* |
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85 | Input |
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86 | iso - isotope |
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87 | Cf252option - 0 to use Spencer's tabulated data |
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88 | 1 to use Boldeman's data |
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89 | Output |
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90 | G4SmpSpNuDistData - sampled multiplicity |
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91 | -1 is the isotope has |
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92 | no multiplicity data, |
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93 | nor any nubar data |
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94 | */ |
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95 | |
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96 | G4int i, index; |
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97 | G4double sum, nubar; |
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98 | G4double r; |
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99 | |
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100 | static G4double sfnu [nSPfissIso][nSPfissn] = { |
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101 | {0.0481677,0.2485215,0.4253044,0.2284094,0.0423438,0.0072533, |
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102 | 0.0000000,0.0000000,0.0000000,0.0000000,0.0000000}, |
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103 | |
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104 | {0.0631852,0.2319644,0.3333230,0.2528207,0.0986461,0.0180199, |
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105 | 0.0020407,0.0000000,0.0000000,0.0000000,0.0000000}, |
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106 | |
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107 | {0.0679423,0.2293159,0.3341228,0.2475507,0.0996922,0.0182398, |
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108 | 0.0031364,0.0000000,0.0000000,0.0000000,0.0000000}, |
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109 | |
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110 | {0.0212550,0.1467407,0.3267531,0.3268277,0.1375090,0.0373815, |
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111 | 0.0025912,0.0007551,0.0001867,0.0000000,0.0000000}, |
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112 | |
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113 | {0.0150050,0.1161725,0.2998427,0.3331614,0.1837748,0.0429780, |
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114 | 0.0087914,0.0002744,0.0000000,0.0000000,0.0000000}, |
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115 | |
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116 | {0.0540647,0.2053880,0.3802279,0.2248483,0.1078646,0.0276366, |
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117 | 0.0000000,0.0000000,0.0000000,0.0000000,0.0000000}, |
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118 | |
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119 | {0.0021100,0.0246700,0.1229000,0.2714400,0.3076300,0.1877000, |
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120 | 0.0677000,0.0140600,0.0016700,0.0001000,0.0000000}, |
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121 | |
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122 | {0.0020900,0.0262100,0.1262000,0.2752000,0.3018000,0.1846000, |
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123 | 0.0668000,0.0150000,0.0021000,0.0000000,0.0000000} }; |
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124 | |
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125 | /* |
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126 | sample the spontaneous fission neutron number distribution |
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127 | */ |
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128 | index = -1; |
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129 | |
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130 | if (isotope == 92238) index = 0; |
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131 | else if (isotope == 94240) index = 1; |
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132 | else if (isotope == 94242) index = 2; |
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133 | else if (isotope == 96242) index = 3; |
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134 | else if (isotope == 96244) index = 4; |
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135 | else if (isotope == 94238) index = 5; |
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136 | else if (isotope == 98252 && Cf252option == 0) index = 6; |
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137 | else if (isotope == 98252 && Cf252option == 1) index = 7; |
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138 | |
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139 | if (index != -1) { |
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140 | r=fisslibrng(); |
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141 | |
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142 | sum=0.; |
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143 | for(i=0; i<nSPfissn; i++) { |
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144 | sum=sum+sfnu[index][i]; |
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145 | if (r <= sum || sfnu[index][i+1] == 0.) return i; |
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146 | } |
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147 | // |
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148 | // Fall through |
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149 | // |
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150 | G4cout << " Random number out of range in SmpSpNuDistData " << G4endl; |
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151 | return -1; |
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152 | |
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153 | } else { |
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154 | // There is no full multiplicity distribution data available |
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155 | // for that isotope, let's try to find a nubar for it in |
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156 | // N. Ensslin, et.al., "Application Guide to Neutron |
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157 | // Multiplicity Counting," LA-13422-M (November 1998) |
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158 | // and use Terrell's approximation |
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159 | nubar = G4SmpSpNubarData(isotope); |
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160 | if (nubar != -1.) { |
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161 | return (G4int) G4SmpTerrell(nubar); |
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162 | } else { |
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163 | // There is no nubar information for that isotope, return -1, |
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164 | // meaning no data available for that isotope |
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165 | return -1; |
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166 | } |
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167 | } |
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168 | } |
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