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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7 | // * conditions of the Geant4 Software License, included in the file * |
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8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
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9 | // * include a list of copyright holders. * |
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10 | // * * |
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11 | // * Neither the authors of this software system, nor their employing * |
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12 | // * institutes,nor the agencies providing financial support for this * |
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13 | // * work make any representation or warranty, express or implied, * |
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14 | // * regarding this software system or assume any liability for its * |
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15 | // * use. Please see the license in the file LICENSE and URL above * |
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16 | // * for the full disclaimer and the limitation of liability. * |
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17 | // * * |
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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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22 | // * use in resulting scientific publications, and indicate your * |
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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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43 | // EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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44 | // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
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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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47 | // WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
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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: G4SmpNugDist.cc,v 1.4 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 | #define nfissg 40 |
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63 | #define alphanegbin 26 |
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64 | |
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65 | G4int G4fissionEvent::G4SmpNugDist(G4int isotope, G4double nubar) { |
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66 | |
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67 | /* |
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68 | Description |
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69 | Sample Number of Photons from neutron induced fission in |
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70 | all isotopes using Tim Valentine's model (negative binomial |
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71 | distribution, using nubar as a model parameter) |
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72 | */ |
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73 | |
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74 | /* |
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75 | Input |
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76 | iso - isotope |
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77 | Output |
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78 | G4SmpNugDist - sampled multiplicity |
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79 | */ |
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80 | |
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81 | static G4double logcoeff[nfissg+1] = { |
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82 | 0.00000000000000e+00, |
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83 | 3.25809653802149e+00, |
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84 | 5.86078622346587e+00, |
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85 | 8.09437844497297e+00, |
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86 | 1.00753799138395e+01, |
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87 | 1.18671393830676e+01, |
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88 | 1.35093671183247e+01, |
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89 | 1.50291928720691e+01, |
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90 | 1.64462588918558e+01, |
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91 | 1.77753948391357e+01, |
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92 | 1.90281578076311e+01, |
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93 | 2.02137814732888e+01, |
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94 | 2.13397927361450e+01, |
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95 | 2.24124295384099e+01, |
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96 | 2.34369338549243e+01, |
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97 | 2.44177631079360e+01, |
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98 | 2.53587464524005e+01, |
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99 | 2.62632027266277e+01, |
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100 | 2.71340310844251e+01, |
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101 | 2.79737817391769e+01, |
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102 | 2.87847119553932e+01, |
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103 | 2.95688309141589e+01, |
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104 | 3.03279360625106e+01, |
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105 | 3.10636428574894e+01, |
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106 | 3.17774093252521e+01, |
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107 | 3.24705565058120e+01, |
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108 | 3.31442856005149e+01, |
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109 | 3.37996924530920e+01, |
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110 | 3.44377798564689e+01, |
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111 | 3.50594680730467e+01, |
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112 | 3.56656038766170e+01, |
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113 | 3.62569683628670e+01, |
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114 | 3.68342837279018e+01, |
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115 | 3.73982191769817e+01, |
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116 | 3.79493960962713e+01, |
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117 | 3.84883925970040e+01, |
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118 | 3.90157475227212e+01, |
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119 | 3.95319639951220e+01, |
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120 | 4.00375125617872e+01, |
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121 | 4.05328339990172e+01, |
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122 | 4.10183418147990e+01 |
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123 | }; |
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124 | G4int i, A, Z; |
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125 | G4double cpi[nfissg+1]; |
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126 | G4double p, q, nubarg; |
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127 | G4double r; |
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128 | |
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129 | /* |
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130 | No data is available for induced fission gamma number |
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131 | distributions. Sample the negative binomial cumulative |
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132 | probability distribution. |
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133 | */ |
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134 | A = (G4int) (isotope-1000*((G4int)(isotope/1000))); |
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135 | Z = (G4int) ((isotope-A)/1000); |
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136 | nubarg = ((2.51-1.13e-5*std::pow(G4double(Z),2.)*std::sqrt(G4double(A)))*nubar+4.0) |
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137 | /(-1.33+119.6*std::pow(G4double(Z),1./3.)/G4double(A)); |
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138 | p = 1.*alphanegbin/(alphanegbin+nubarg); |
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139 | q = 1.-p; |
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140 | cpi[0] = std::exp(logcoeff[0]+26.*std::log(p)); |
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141 | for (i=1; i<=nfissg; i++) cpi[i] = cpi[i-1] + std::exp(logcoeff[i]+26.*std::log(p)+i*std::log(q)); |
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142 | for (i=0; i<=nfissg; i++) cpi[i] = cpi[i]/cpi[nfissg-1]; |
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143 | |
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144 | r=fisslibrng(); |
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145 | |
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146 | for(i=0; i<=nfissg; i++) if (r <= cpi[i]) return i; |
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147 | |
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148 | // |
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149 | // Fall through |
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150 | // |
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151 | |
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152 | G4cout << " SmpNugDist: random number " << r << " out of range " << G4endl; |
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153 | return -1; |
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154 | |
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155 | } |
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