1 | // |
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2 | // ******************************************************************** |
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3 | // * License and Disclaimer * |
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4 | // * * |
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5 | // * The Geant4 software is copyright of the Copyright Holders of * |
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6 | // * the Geant4 Collaboration. It is provided under the terms and * |
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15 | // * use. Please see the license in the file LICENSE and URL above * |
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18 | // * This code implementation is the result of the scientific and * |
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19 | // * technical work of the GEANT4 collaboration. * |
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20 | // * By using, copying, modifying or distributing the software (or * |
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21 | // * any work based on the software) you agree to acknowledge its * |
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23 | // * acceptance of all terms of the Geant4 Software license. * |
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24 | // ******************************************************************** |
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25 | // |
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26 | // |
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27 | // This software was developed by Lawrence Livermore National Laboratory. |
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28 | // |
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29 | // Redistribution and use in source and binary forms, with or without |
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30 | // modification, are permitted provided that the following conditions are met: |
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31 | // |
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32 | // 1. Redistributions of source code must retain the above copyright notice, |
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33 | // this list of conditions and the following disclaimer. |
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34 | // 2. Redistributions in binary form must reproduce the above copyright notice, |
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35 | // this list of conditions and the following disclaimer in the documentation |
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36 | // and/or other materials provided with the distribution. |
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37 | // 3. The name of the author may not be used to endorse or promote products |
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38 | // derived from this software without specific prior written permission. |
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39 | // |
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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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42 | // MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO |
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45 | // PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; |
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46 | // OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
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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: G4SmpNuDistDataU233_235.cc,v 1.2 2007/06/01 13:46:53 gcosmo Exp $ |
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57 | // |
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58 | |
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59 | #include <cmath> |
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60 | #include "G4fissionEvent.hh" |
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61 | |
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62 | int G4fissionEvent::G4SmpNuDistDataU233_235(G4double nubar) { |
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63 | |
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64 | /* |
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65 | Description |
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66 | Sample Number of Neutrons from fission in U-233 and U-235 using |
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67 | Zucker and Holden's tabulated data for U-235 |
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68 | The P(nu) distribution is given as a function of the average |
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69 | number of neutrons from fission, based on interpolation of the |
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70 | U-235 data from Zucker and Holden. |
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71 | */ |
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72 | |
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73 | /* |
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74 | Input |
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75 | nubar - average number of neutrons per fission |
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76 | Output |
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77 | G4SmpNuDistDataU233_235 - sampled multiplicity |
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78 | |
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79 | */ |
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80 | |
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81 | G4double pnu[8], cpnu, sum; |
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82 | G4double r; |
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83 | |
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84 | /* |
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85 | Check if nubar is within the range of experimental values |
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86 | */ |
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87 | if(nubar >= 2.25 && nubar <= 4.0) { |
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88 | /* |
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89 | Use Zucker and Holden Data |
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90 | */ |
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91 | if(nubar <= 2.8738) pnu[0]=-9.279554e-02*std::pow(nubar,3)+8.036687e-01*std::pow(nubar,2)-2.342684*nubar+2.309035; |
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92 | else if(nubar > 2.8738 && nubar <= 3.4272) pnu[0]=1.50072e-2*std::pow(nubar,2)-1.109109e-1*nubar+2.063133e-1; |
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93 | else pnu[0]=1.498897e+3*std::exp(-3.883864*nubar); |
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94 | |
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95 | if(nubar <= 3.2316) pnu[1]=3.531126e-2*std::pow(nubar,3)-2.787213e-1*std::pow(nubar,2)+5.824072e-1*nubar-1.067136e-1; |
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96 | else pnu[1]=6.574492e-2*std::pow(nubar,2)-5.425741e-1*nubar+1.123199; |
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97 | |
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98 | pnu[2]=1.274643e-2*std::pow(nubar,3)-1.387954e-1*std::pow(nubar,2)+3.264669e-1*nubar+1.77148e-1; |
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99 | |
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100 | pnu[3]=5.473738e-2*std::pow(nubar,5)-8.835826e-1*std::pow(nubar,4)+5.657201*std::pow(nubar,3)-1.802669e+1*std::pow(nubar,2)+2.867937e+1*nubar-1.794296e+1; |
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101 | |
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102 | pnu[4]=-3.591076e-2*std::pow(nubar,3)+3.092624e-1*std::pow(nubar,2)-7.184805e-1*nubar+5.649400e-1; |
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103 | |
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104 | if(nubar <= 2.8738) pnu[5]=1.699374e-2*std::pow(nubar,2)-1.069558e-3*nubar-6.981430e-2; |
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105 | else pnu[5]=2.100175e-2*std::pow(nubar,3)-1.705788e-1*std::pow(nubar,2)+5.575467e-1*nubar-6.245873e-1; |
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106 | |
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107 | if(nubar <= 3.0387) pnu[6]=9.431919e-7*std::pow(nubar,8.958848); |
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108 | else pnu[6]=4.322428e-3*std::pow(nubar,3)-2.094790e-2*std::pow(nubar,2)+4.449671e-2*nubar-4.435987e-2; |
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109 | |
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110 | pnu[7]=5.689084e-3*std::pow(nubar,4)-6.591895e-2*std::pow(nubar,3)+2.886861e-1*std::pow(nubar,2)-5.588146e-1*nubar+4.009166e-1; |
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111 | |
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112 | sum=pnu[0]+pnu[1]+pnu[2]+pnu[3]+pnu[4]+pnu[5]+pnu[6]+pnu[7]; |
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113 | |
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114 | pnu[0]=pnu[0]/sum; |
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115 | pnu[1]=pnu[1]/sum; |
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116 | pnu[2]=pnu[2]/sum; |
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117 | pnu[3]=pnu[3]/sum; |
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118 | pnu[4]=pnu[4]/sum; |
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119 | pnu[5]=pnu[5]/sum; |
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120 | pnu[6]=pnu[6]/sum; |
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121 | pnu[7]=pnu[7]/sum; |
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122 | |
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123 | r=fisslibrng(); |
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124 | |
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125 | if(r <= pnu[0]) return (int) 0; |
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126 | |
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127 | cpnu=pnu[0]+pnu[1]; |
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128 | if(r <= cpnu) return (int) 1; |
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129 | |
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130 | cpnu=cpnu+pnu[2]; |
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131 | if(r <= cpnu) return (int) 2; |
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132 | |
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133 | cpnu=cpnu+pnu[3]; |
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134 | if(r <= cpnu) return (int) 3; |
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135 | |
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136 | cpnu=cpnu+pnu[4]; |
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137 | if(r <= cpnu) return (int) 4; |
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138 | |
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139 | cpnu=cpnu+pnu[5]; |
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140 | if(r <= cpnu) return (int) 5; |
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141 | |
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142 | cpnu=cpnu+pnu[6]; |
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143 | if(r <= cpnu) return (int) 6; |
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144 | else return (int) 7; |
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145 | } else { |
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146 | /* |
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147 | Use Terrell's formula |
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148 | */ |
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149 | return (int) G4SmpTerrell(nubar); |
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150 | } |
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151 | } |
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