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2 | // ******************************************************************** |
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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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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: G4SmpNuDistDataU233_235_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::G4SmpNuDistDataU233_235_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 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 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 U-235 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 | G4SmpNuDistDataU233_235_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 U235nu [11] [8] = { |
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83 | {.0317223, .1717071, .3361991, .3039695, .1269459, .0266793, .0026322, .0001449}, |
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84 | {.0237898, .1555525, .3216515, .3150433, .1444732, .0356013, .0034339, .0004546}, |
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85 | {.0183989, .1384891, .3062123, .3217566, .1628673, .0455972, .0055694, .0011093}, |
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86 | {.0141460, .1194839, .2883075, .3266568, .1836014, .0569113, .0089426, .0019504}, |
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87 | {.0115208, .1032624, .2716849, .3283426, .2021206, .0674456, .0128924, .0027307}, |
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88 | {.0078498, .0802010, .2456595, .3308175, .2291646, .0836912, .0187016, .0039148}, |
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89 | {.0046272, .0563321, .2132296, .3290407, .2599806, .1045974, .0265604, .0056322}, |
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90 | {.0024659, .0360957, .1788634, .3210507, .2892537, .1282576, .0360887, .0079244}, |
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91 | {.0012702, .0216090, .1472227, .3083032, .3123950, .1522540, .0462449, .0107009}, |
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92 | {.0007288, .0134879, .1231200, .2949390, .3258251, .1731879, .0551737, .0135376}, |
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93 | {.0004373, .0080115, .1002329, .2779283, .3342611, .1966100, .0650090, .0175099} |
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94 | }; |
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95 | static G4double U235nubar [11] = { |
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96 | 2.4140000, |
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97 | 2.5236700, |
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98 | 2.6368200, |
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99 | 2.7623400, |
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100 | 2.8738400, |
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101 | 3.0386999, |
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102 | 3.2316099, |
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103 | 3.4272800, |
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104 | 3.6041900, |
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105 | 3.7395900, |
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106 | 3.8749800 |
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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 >= U235nubar[0] && nubar <= U235nubar[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 > U235nubar[engind]){ engind++;} |
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120 | fraction = (nubar-U235nubar[engind-1])/(U235nubar[engind]-U235nubar[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 = U235nu[engind][0]; |
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126 | while (r > cum && nu < 7){ |
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127 | nu++; |
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128 | cum += U235nu[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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