1 | // |
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2 | // ******************************************************************** |
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3 | // * License and Disclaimer * |
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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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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 | // $Id: G4StatMFMicroCanonical.cc,v 1.7 2008/07/25 11:20:47 vnivanch Exp $ |
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28 | // GEANT4 tag $Name: geant4-09-03 $ |
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29 | // |
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30 | // Hadronic Process: Nuclear De-excitations |
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31 | // by V. Lara |
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32 | |
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33 | |
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34 | #include "G4StatMFMicroCanonical.hh" |
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35 | #include "G4HadronicException.hh" |
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36 | #include <numeric> |
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37 | |
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38 | |
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39 | // Copy constructor |
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40 | G4StatMFMicroCanonical::G4StatMFMicroCanonical(const G4StatMFMicroCanonical & |
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41 | ) : G4VStatMFEnsemble() |
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42 | { |
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43 | throw G4HadronicException(__FILE__, __LINE__, "G4StatMFMicroCanonical::copy_constructor meant to not be accessable"); |
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44 | } |
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45 | |
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46 | // Operators |
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47 | |
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48 | G4StatMFMicroCanonical & G4StatMFMicroCanonical:: |
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49 | operator=(const G4StatMFMicroCanonical & ) |
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50 | { |
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51 | throw G4HadronicException(__FILE__, __LINE__, "G4StatMFMicroCanonical::operator= meant to not be accessable"); |
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52 | return *this; |
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53 | } |
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54 | |
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55 | |
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56 | G4bool G4StatMFMicroCanonical::operator==(const G4StatMFMicroCanonical & ) const |
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57 | { |
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58 | throw G4HadronicException(__FILE__, __LINE__, "G4StatMFMicroCanonical::operator== meant to not be accessable"); |
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59 | return false; |
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60 | } |
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61 | |
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62 | |
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63 | G4bool G4StatMFMicroCanonical::operator!=(const G4StatMFMicroCanonical & ) const |
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64 | { |
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65 | throw G4HadronicException(__FILE__, __LINE__, "G4StatMFMicroCanonical::operator!= meant to not be accessable"); |
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66 | return true; |
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67 | } |
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68 | |
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69 | |
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70 | |
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71 | // constructor |
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72 | G4StatMFMicroCanonical::G4StatMFMicroCanonical(G4Fragment const & theFragment) |
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73 | { |
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74 | // Perform class initialization |
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75 | Initialize(theFragment); |
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76 | |
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77 | } |
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78 | |
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79 | |
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80 | // destructor |
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81 | G4StatMFMicroCanonical::~G4StatMFMicroCanonical() |
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82 | { |
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83 | // garbage collection |
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84 | if (!_ThePartitionManagerVector.empty()) { |
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85 | std::for_each(_ThePartitionManagerVector.begin(), |
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86 | _ThePartitionManagerVector.end(), |
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87 | DeleteFragment()); |
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88 | } |
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89 | } |
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90 | |
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91 | |
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92 | |
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93 | // Initialization method |
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94 | |
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95 | void G4StatMFMicroCanonical::Initialize(const G4Fragment & theFragment) |
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96 | { |
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97 | |
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98 | std::vector<G4StatMFMicroManager*>::iterator it; |
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99 | |
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100 | // Excitation Energy |
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101 | G4double U = theFragment.GetExcitationEnergy(); |
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102 | |
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103 | G4double A = theFragment.GetA(); |
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104 | G4double Z = theFragment.GetZ(); |
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105 | |
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106 | // Configuration temperature |
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107 | G4double TConfiguration = std::sqrt(8.0*U/A); |
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108 | |
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109 | // Free internal energy at Temperature T = 0 |
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110 | __FreeInternalE0 = A*( |
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111 | // Volume term (for T = 0) |
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112 | -G4StatMFParameters::GetE0() + |
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113 | // Symmetry term |
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114 | G4StatMFParameters::GetGamma0()*(1.0-2.0*Z/A)*(1.0-2.0*Z/A) |
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115 | ) + |
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116 | // Surface term (for T = 0) |
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117 | G4StatMFParameters::GetBeta0()*std::pow(A,2.0/3.0) + |
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118 | // Coulomb term |
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119 | elm_coupling*(3.0/5.0)*Z*Z/(G4StatMFParameters::Getr0()*std::pow(A,1.0/3.0)); |
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120 | |
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121 | // Statistical weight |
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122 | G4double W = 0.0; |
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123 | |
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124 | |
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125 | // Mean breakup multiplicity |
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126 | __MeanMultiplicity = 0.0; |
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127 | |
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128 | // Mean channel temperature |
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129 | __MeanTemperature = 0.0; |
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130 | |
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131 | // Mean channel entropy |
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132 | __MeanEntropy = 0.0; |
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133 | |
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134 | // Calculate entropy of compound nucleus |
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135 | G4double SCompoundNucleus = CalcEntropyOfCompoundNucleus(theFragment,TConfiguration); |
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136 | |
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137 | // Statistical weight of compound nucleus |
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138 | _WCompoundNucleus = 1.0; // std::exp(SCompoundNucleus - SCompoundNucleus); |
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139 | |
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140 | W += _WCompoundNucleus; |
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141 | |
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142 | |
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143 | |
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144 | // Maximal fragment multiplicity allowed in direct simulation |
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145 | G4int MaxMult = G4StatMFMicroCanonical::MaxAllowedMultiplicity; |
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146 | if (A > 110) MaxMult -= 1; |
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147 | |
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148 | |
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149 | |
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150 | for (G4int m = 2; m <= MaxMult; m++) { |
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151 | G4StatMFMicroManager * aMicroManager = |
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152 | new G4StatMFMicroManager(theFragment,m,__FreeInternalE0,SCompoundNucleus); |
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153 | _ThePartitionManagerVector.push_back(aMicroManager); |
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154 | } |
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155 | |
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156 | // W is the total probability |
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157 | W = std::accumulate(_ThePartitionManagerVector.begin(), |
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158 | _ThePartitionManagerVector.end(), |
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159 | W,SumProbabilities()); |
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160 | |
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161 | // Normalization of statistical weights |
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162 | for (it = _ThePartitionManagerVector.begin(); it != _ThePartitionManagerVector.end(); ++it) |
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163 | { |
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164 | (*it)->Normalize(W); |
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165 | } |
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166 | |
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167 | _WCompoundNucleus /= W; |
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168 | |
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169 | __MeanMultiplicity += 1.0 * _WCompoundNucleus; |
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170 | __MeanTemperature += TConfiguration * _WCompoundNucleus; |
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171 | __MeanEntropy += SCompoundNucleus * _WCompoundNucleus; |
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172 | |
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173 | |
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174 | for (it = _ThePartitionManagerVector.begin(); it != _ThePartitionManagerVector.end(); ++it) |
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175 | { |
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176 | __MeanMultiplicity += (*it)->GetMeanMultiplicity(); |
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177 | __MeanTemperature += (*it)->GetMeanTemperature(); |
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178 | __MeanEntropy += (*it)->GetMeanEntropy(); |
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179 | } |
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180 | |
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181 | return; |
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182 | } |
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183 | |
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184 | |
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185 | |
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186 | |
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187 | |
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188 | G4double G4StatMFMicroCanonical::CalcFreeInternalEnergy(const G4Fragment & theFragment, |
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189 | const G4double T) |
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190 | { |
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191 | G4double A = theFragment.GetA(); |
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192 | G4double Z = theFragment.GetZ(); |
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193 | G4double A13 = std::pow(A,1.0/3.0); |
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194 | |
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195 | G4double InvLevelDensityPar = G4StatMFParameters::GetEpsilon0()*(1.0 + 3.0/(A-1.0)); |
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196 | |
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197 | G4double VolumeTerm = (-G4StatMFParameters::GetE0()+T*T/InvLevelDensityPar)*A; |
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198 | |
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199 | G4double SymmetryTerm = G4StatMFParameters::GetGamma0()*(A - 2.0*Z)*(A - 2.0*Z)/A; |
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200 | |
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201 | G4double SurfaceTerm = (G4StatMFParameters::Beta(T)-T*G4StatMFParameters::DBetaDT(T))*A13*A13; |
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202 | |
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203 | G4double CoulombTerm = elm_coupling*(3.0/5.0)*Z*Z/(G4StatMFParameters::Getr0()*A13); |
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204 | |
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205 | return VolumeTerm + SymmetryTerm + SurfaceTerm + CoulombTerm; |
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206 | } |
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207 | |
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208 | |
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209 | |
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210 | G4double G4StatMFMicroCanonical::CalcEntropyOfCompoundNucleus(const G4Fragment & theFragment,G4double & TConf) |
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211 | // Calculates Temperature and Entropy of compound nucleus |
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212 | { |
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213 | const G4double A = theFragment.GetA(); |
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214 | // const G4double Z = theFragment.GetZ(); |
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215 | const G4double U = theFragment.GetExcitationEnergy(); |
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216 | const G4double A13 = std::pow(A,1.0/3.0); |
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217 | |
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218 | G4double Ta = std::max(std::sqrt(U/(0.125*A)),0.0012*MeV); |
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219 | G4double Tb = Ta; |
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220 | |
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221 | G4double ECompoundNucleus = CalcFreeInternalEnergy(theFragment,Ta); |
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222 | G4double Da = (U+__FreeInternalE0-ECompoundNucleus)/U; |
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223 | G4double Db = 0.0; |
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224 | |
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225 | |
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226 | G4double InvLevelDensity = CalcInvLevelDensity(static_cast<G4int>(A)); |
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227 | |
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228 | |
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229 | // bracketing the solution |
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230 | if (Da == 0.0) { |
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231 | TConf = Ta; |
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232 | return 2*Ta*A/InvLevelDensity - G4StatMFParameters::DBetaDT(Ta)*A13*A13; |
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233 | } else if (Da < 0.0) { |
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234 | do { |
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235 | Tb -= 0.5*Tb; |
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236 | ECompoundNucleus = CalcFreeInternalEnergy(theFragment,Tb); |
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237 | Db = (U+__FreeInternalE0-ECompoundNucleus)/U; |
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238 | } while (Db < 0.0); |
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239 | } else { |
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240 | do { |
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241 | Tb += 0.5*Tb; |
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242 | ECompoundNucleus = CalcFreeInternalEnergy(theFragment,Tb); |
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243 | Db = (U+__FreeInternalE0-ECompoundNucleus)/U; |
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244 | } while (Db > 0.0); |
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245 | } |
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246 | |
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247 | |
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248 | G4double eps = 1.0e-14 * std::abs(Tb-Ta); |
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249 | |
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250 | for (G4int i = 0; i < 1000; i++) { |
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251 | G4double Tc = (Ta+Tb)/2.0; |
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252 | if (std::abs(Ta-Tb) <= eps) { |
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253 | TConf = Tc; |
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254 | return 2*Tc*A/InvLevelDensity - G4StatMFParameters::DBetaDT(Tc)*A13*A13; |
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255 | } |
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256 | ECompoundNucleus = CalcFreeInternalEnergy(theFragment,Tc); |
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257 | G4double Dc = (U+__FreeInternalE0-ECompoundNucleus)/U; |
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258 | |
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259 | if (Dc == 0.0) { |
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260 | TConf = Tc; |
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261 | return 2*Tc*A/InvLevelDensity - G4StatMFParameters::DBetaDT(Tc)*A13*A13; |
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262 | } |
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263 | |
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264 | if (Da*Dc < 0.0) { |
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265 | Tb = Tc; |
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266 | Db = Dc; |
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267 | } else { |
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268 | Ta = Tc; |
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269 | Da = Dc; |
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270 | } |
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271 | } |
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272 | |
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273 | G4cerr << |
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274 | "G4StatMFMicrocanoncal::CalcEntropyOfCompoundNucleus: I can't calculate the temperature" |
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275 | << G4endl; |
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276 | |
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277 | return 0.0; |
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278 | } |
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279 | |
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280 | |
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281 | |
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282 | |
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283 | G4StatMFChannel * G4StatMFMicroCanonical::ChooseAandZ(const G4Fragment & theFragment) |
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284 | // Choice of fragment atomic numbers and charges |
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285 | { |
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286 | // We choose a multiplicity (1,2,3,...) and then a channel |
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287 | G4double RandNumber = G4UniformRand(); |
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288 | |
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289 | if (RandNumber < _WCompoundNucleus) { |
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290 | |
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291 | G4StatMFChannel * aChannel = new G4StatMFChannel; |
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292 | aChannel->CreateFragment(theFragment.GetA(),theFragment.GetZ()); |
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293 | return aChannel; |
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294 | |
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295 | } else { |
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296 | |
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297 | G4double AccumWeight = _WCompoundNucleus; |
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298 | std::vector<G4StatMFMicroManager*>::iterator it; |
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299 | for (it = _ThePartitionManagerVector.begin(); it != _ThePartitionManagerVector.end(); ++it) { |
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300 | AccumWeight += (*it)->GetProbability(); |
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301 | if (RandNumber < AccumWeight) { |
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302 | return (*it)->ChooseChannel(theFragment.GetA(),theFragment.GetZ(),__MeanTemperature); |
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303 | } |
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304 | } |
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305 | throw G4HadronicException(__FILE__, __LINE__, "G4StatMFMicroCanonical::ChooseAandZ: wrong normalization!"); |
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306 | } |
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307 | |
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308 | return 0; |
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309 | } |
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310 | |
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311 | |
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312 | |
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313 | |
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314 | G4double G4StatMFMicroCanonical::CalcInvLevelDensity(const G4int anA) |
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315 | { |
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316 | // Calculate Inverse Density Level |
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317 | // Epsilon0*(1 + 3 /(Af - 1)) |
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318 | if (anA == 1) return 0.0; |
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319 | else return |
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320 | G4StatMFParameters::GetEpsilon0()*(1.0+3.0/(anA - 1.0)); |
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321 | } |
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