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2 | // ******************************************************************** |
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3 | // * License and Disclaimer * |
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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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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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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: G4SmpNuDistDataPu239_241.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 | G4int G4fissionEvent::G4SmpNuDistDataPu239_241(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 Pu-239 and Pu-241 using |
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67 | Zucker and Holden's tabulated data for Pu-239 |
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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 | Pu-239 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 | G4SmpNuDistDataPu239_241 - sampled multiplicity |
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78 | |
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79 | */ |
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80 | |
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81 | G4double pnu[9], 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 >= 2.85 && nubar <= 4.25) { |
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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 | pnu[0]=-2.412937e-3*std::pow(nubar,3)+3.210687e-2*std::pow(nubar,2)-1.434037e-1*nubar+2.150733e-1; |
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92 | pnu[1]=-2.650615e-2*std::pow(nubar,3)+3.290389e-1*std::pow(nubar,2)-1.389007*nubar+2.002327; |
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93 | pnu[2]=3.232028e-2*std::pow(nubar,3)-3.176093e-1*std::pow(nubar,2)+8.605098e-1*nubar-3.411191e-1; |
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94 | pnu[3]=1.623289e-2*std::pow(nubar,3)-2.414705e-1*std::pow(nubar,2)+1.007282*nubar-9.583769e-1; |
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95 | pnu[4]=1.932275e-2*std::pow(nubar,3)-2.923666e-1*std::pow(nubar,2)+1.421383*nubar-1.924025; |
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96 | pnu[5]=-6.185679e-2*std::pow(nubar,3)+6.82888e-1*std::pow(nubar,2)-2.347653*nubar+2.647049; |
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97 | pnu[6]=1.79773e-2*std::pow(nubar,3)-1.60516e-1*std::pow(nubar,2)+5.228077e-1*nubar-5.939556e-1; |
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98 | pnu[7]=3.530038e-3*std::pow(nubar,4)-4.925425e-2*std::pow(nubar,3)+2.726784e-1*std::pow(nubar,2)-6.81281e-1*nubar+6.347577e-1; |
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99 | pnu[8]=2.837523e-3*std::pow(nubar,3)-2.678644e-2*std::pow(nubar,2)+8.545638e-2*nubar-9.156078e-2; |
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100 | |
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101 | sum=pnu[0]+pnu[1]+pnu[2]+pnu[3]+pnu[4]+pnu[5]+pnu[6]+pnu[7]+pnu[8]; |
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102 | |
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103 | pnu[0]=pnu[0]/sum; |
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104 | pnu[1]=pnu[1]/sum; |
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105 | pnu[2]=pnu[2]/sum; |
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106 | pnu[3]=pnu[3]/sum; |
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107 | pnu[4]=pnu[4]/sum; |
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108 | pnu[5]=pnu[5]/sum; |
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109 | pnu[6]=pnu[6]/sum; |
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110 | pnu[7]=pnu[7]/sum; |
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111 | pnu[8]=pnu[8]/sum; |
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112 | |
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113 | r=fisslibrng(); |
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114 | |
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115 | if(r <= pnu[0]) return 0; |
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116 | |
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117 | cpnu=pnu[0]+pnu[1]; |
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118 | if(r <= cpnu) return 1; |
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119 | |
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120 | cpnu=cpnu+pnu[2]; |
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121 | if(r <= cpnu) return 2; |
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122 | |
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123 | cpnu=cpnu+pnu[3]; |
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124 | if(r <= cpnu) return 3; |
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125 | |
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126 | cpnu=cpnu+pnu[4]; |
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127 | if(r <= cpnu) return 4; |
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128 | |
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129 | cpnu=cpnu+pnu[5]; |
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130 | if(r <= cpnu) return 5; |
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131 | |
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132 | cpnu=cpnu+pnu[6]; |
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133 | if(r <= cpnu) return 6; |
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134 | |
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135 | cpnu=cpnu+pnu[7]; |
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136 | if(r <= cpnu) return 7; |
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137 | else return 8; |
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138 | |
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139 | } else { |
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140 | /* |
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141 | Use Terrell's formula |
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142 | */ |
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143 | return (G4int) G4SmpTerrell(nubar); |
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144 | } |
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145 | } |
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