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27 | // This software was developed by Lawrence Livermore National Laboratory. |
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40 | // THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
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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_MC.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_MC(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 11 P(nu) distributions are given as a function of nubar, |
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69 | the average number of neutrons from induced fission for the |
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70 | 11 different energies (0 to 10 MeV), based on the Pu-239 data |
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71 | from Zucker and Holden. |
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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 | nubar - average number of neutrons per fission |
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77 | Output |
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78 | G4SmpNuDistDataPu239_241_MC - sampled multiplicity |
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79 | |
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80 | */ |
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81 | |
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82 | static G4double Pu239nu [11] [9] = { |
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83 | {.0108826, .0994916, .2748898, .3269196, .2046061, .0726834, .0097282, .0006301, .0001685}, |
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84 | {.0084842, .0790030, .2536175, .3289870, .2328111, .0800161, .0155581, .0011760, .0003469}, |
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85 | {.0062555, .0611921, .2265608, .3260637, .2588354, .0956070, .0224705, .0025946, .0005205}, |
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86 | {.0045860, .0477879, .1983002, .3184667, .2792811, .1158950, .0301128, .0048471, .0007233}, |
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87 | {.0032908, .0374390, .1704196, .3071862, .2948565, .1392594, .0386738, .0078701, .0010046}, |
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88 | {.0022750, .0291416, .1437645, .2928006, .3063902, .1641647, .0484343, .0116151, .0014149}, |
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89 | {.0014893, .0222369, .1190439, .2756297, .3144908, .1892897, .0597353, .0160828, .0029917}, |
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90 | {.0009061, .0163528, .0968110, .2558524, .3194566, .2134888, .0729739, .0213339, .0020017}, |
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91 | {.0004647, .0113283, .0775201, .2335926, .3213289, .2356614, .0886183, .0274895, .0039531}, |
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92 | {.0002800, .0071460, .0615577, .2089810, .3200121, .2545846, .1072344, .0347255, .0054786}, |
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93 | {.0002064, .0038856, .0492548, .1822078, .3154159, .2687282, .1295143, .0432654, .0075217} |
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94 | }; |
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95 | static G4double Pu239nubar [11] = { |
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96 | 2.8760000, |
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97 | 3.0088800, |
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98 | 3.1628300, |
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99 | 3.3167800, |
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100 | 3.4707300, |
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101 | 3.6246800, |
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102 | 3.7786300, |
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103 | 3.9325800, |
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104 | 4.0865300, |
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105 | 4.2404900, |
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106 | 4.3944400 |
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107 | }; |
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108 | G4double fraction, r, cum; |
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109 | G4int engind, nu; |
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110 | |
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111 | /* |
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112 | Check if nubar is within the range of experimental values |
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113 | */ |
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114 | if(nubar >= Pu239nubar[0] && nubar <= Pu239nubar[10]) { |
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115 | /* |
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116 | Use Zucker and Holden Data |
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117 | */ |
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118 | engind = 1; |
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119 | while (nubar > Pu239nubar[engind]){ engind++;} |
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120 | fraction = (nubar-Pu239nubar[engind-1])/(Pu239nubar[engind]-Pu239nubar[engind-1]); |
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121 | if(fisslibrng() > fraction) engind--; |
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122 | |
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123 | r = fisslibrng(); |
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124 | nu = 0; |
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125 | cum = Pu239nu[engind][0]; |
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126 | while (r > cum && nu < 8){ |
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127 | nu++; |
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128 | cum += Pu239nu[engind][nu]; |
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129 | } |
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130 | return nu; |
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131 | } else { |
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132 | /* |
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133 | Use Terrell's formula |
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134 | */ |
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135 | return (G4int) G4SmpTerrell(nubar); |
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136 | } |
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137 | } |
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