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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: G4SmpNuDistDataU232_234_236_238_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::G4SmpNuDistDataU232_234_236_238_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-232, U-234, U-236, |
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67 | and U-238 using Zucker and Holden's tabulated data for U-238 |
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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-238 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 | G4SmpNuDistDataU232_234_236_238_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 U238nu [11] [9] = { |
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83 | {.0396484, .2529541, .2939544, .2644470, .1111758, .0312261, .0059347, .0005436, .0001158}, |
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84 | {.0299076, .2043215, .2995886, .2914889, .1301480, .0363119, .0073638, .0006947, .0001751}, |
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85 | {.0226651, .1624020, .2957263, .3119098, .1528786, .0434233, .0097473, .0009318, .0003159}, |
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86 | {.0170253, .1272992, .2840540, .3260192, .1779579, .0526575, .0130997, .0013467, .0005405}, |
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87 | {.0124932, .0984797, .2661875, .3344938, .2040116, .0640468, .0173837, .0020308, .0008730}, |
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88 | {.0088167, .0751744, .2436570, .3379711, .2297901, .0775971, .0225619, .0030689, .0013626}, |
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89 | {.0058736, .0565985, .2179252, .3368863, .2541575, .0933127, .0286200, .0045431, .0031316}, |
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90 | {.0035997, .0420460, .1904095, .3314575, .2760413, .1112075, .0355683, .0065387, .0031316}, |
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91 | {.0019495, .0309087, .1625055, .3217392, .2943792, .1313074, .0434347, .0091474, .0046284}, |
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92 | {.0008767, .0226587, .1356058, .3076919, .3080816, .1536446, .0522549, .0124682, .0067176}, |
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93 | {.0003271, .0168184, .1111114, .2892434, .3160166, .1782484, .0620617, .0166066, .0095665} |
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94 | }; |
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95 | static G4double U238nubar [11] = { |
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96 | 2.2753781, |
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97 | 2.4305631, |
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98 | 2.5857481, |
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99 | 2.7409331, |
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100 | 2.8961181, |
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101 | 3.0513031, |
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102 | 3.2064881, |
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103 | 3.3616731, |
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104 | 3.5168581, |
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105 | 3.6720432, |
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106 | 3.8272281 |
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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 >= U238nubar[0] && nubar <= U238nubar[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 > U238nubar[engind]){ engind++;} |
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120 | fraction = (nubar-U238nubar[engind-1])/(U238nubar[engind]-U238nubar[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 = U238nu[engind][0]; |
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126 | while (r > cum && nu < 8){ |
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127 | nu++; |
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128 | cum += U238nu[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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