1 | // |
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2 | // ******************************************************************** |
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3 | // * License and Disclaimer * |
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4 | // * * |
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5 | // * The Geant4 software is copyright of the Copyright Holders of * |
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6 | // * the Geant4 Collaboration. It is provided under the terms and * |
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7 | // * conditions of the Geant4 Software License, included in the file * |
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8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
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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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12 | // * institutes,nor the agencies providing financial support for this * |
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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 | // ------------------------------------------------------------------- |
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28 | // GEANT 4 class file |
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29 | // |
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30 | // CERN, Geneva, Switzerland |
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31 | // |
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32 | // File name: G4VGammaDeexcitation |
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33 | // |
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34 | // Author: Maria Grazia Pia (pia@genova.infn.it) |
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35 | // |
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36 | // Creation date: 23 October 1998 |
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37 | // |
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38 | // Modifications: |
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39 | // |
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40 | // 21 Nov 2001, Fan Lei (flei@space.qinetiq.com) |
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41 | // Modified GenerateGamma() and UpdateUncleus() for implementation |
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42 | // of Internal Conversion processs |
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43 | // |
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44 | // 15 April 1999, Alessandro Brunengo (Alessandro.Brunengo@ge.infn.it) |
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45 | // Added creation time evaluation for products of evaporation |
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46 | // |
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47 | // |
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48 | // ------------------------------------------------------------------- |
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49 | |
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50 | #include "G4VGammaDeexcitation.hh" |
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51 | |
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52 | #include "globals.hh" |
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53 | #include "Randomize.hh" |
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54 | #include "G4Gamma.hh" |
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55 | #include "G4Electron.hh" |
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56 | #include "G4LorentzVector.hh" |
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57 | #include "G4VGammaTransition.hh" |
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58 | #include "G4Fragment.hh" |
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59 | #include "G4FragmentVector.hh" |
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60 | |
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61 | #include "G4ParticleTable.hh" |
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62 | #include "G4IonTable.hh" |
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63 | |
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64 | #include "G4DiscreteGammaTransition.hh" |
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65 | |
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66 | G4VGammaDeexcitation::G4VGammaDeexcitation(): _transition(0), _verbose(0), |
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67 | _electronO (0), _vSN(-1) |
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68 | { } |
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69 | |
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70 | |
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71 | G4VGammaDeexcitation::~G4VGammaDeexcitation() |
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72 | { |
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73 | // if (_transition != 0) delete _transition; |
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74 | } |
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75 | |
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76 | |
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77 | G4FragmentVector* G4VGammaDeexcitation::DoTransition() |
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78 | { |
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79 | // Template method |
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80 | |
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81 | Initialize(); |
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82 | G4FragmentVector* products = new G4FragmentVector; |
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83 | |
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84 | if (CanDoTransition()) |
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85 | { |
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86 | G4Fragment* gamma = GenerateGamma(); |
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87 | if (gamma != 0) |
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88 | { |
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89 | products->push_back(gamma); |
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90 | UpdateNucleus(gamma); |
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91 | Update(); |
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92 | } |
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93 | } |
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94 | |
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95 | if (_verbose > 1) |
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96 | G4cout << "G4VGammaDeexcitation::DoTransition - Transition deleted " << G4endl; |
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97 | |
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98 | if (_transition != 0) delete _transition; |
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99 | |
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100 | return products; |
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101 | } |
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102 | |
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103 | G4FragmentVector* G4VGammaDeexcitation::DoChain() |
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104 | { |
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105 | Initialize(); |
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106 | G4FragmentVector* products = new G4FragmentVector; |
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107 | |
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108 | while (CanDoTransition()) |
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109 | { |
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110 | if (_verbose > 5) G4cout << "G4VGammaDeexcitation::DoChain - Looping" << G4endl; |
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111 | |
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112 | G4Fragment* gamma = GenerateGamma(); |
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113 | if (gamma != 0) |
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114 | { |
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115 | products->push_back(gamma); |
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116 | UpdateNucleus(gamma); |
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117 | UpdateElectrons (); |
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118 | } |
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119 | Update(); |
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120 | } |
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121 | |
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122 | if (_verbose > 1) |
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123 | G4cout << "G4VGammaDeexcitation::DoChain - Transition deleted, end of chain " << G4endl; |
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124 | |
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125 | if (_transition != 0) delete _transition; |
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126 | |
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127 | return products; |
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128 | } |
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129 | |
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130 | |
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131 | const G4Fragment& G4VGammaDeexcitation::GetNucleus() const |
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132 | { |
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133 | return _nucleus; |
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134 | } |
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135 | |
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136 | |
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137 | void G4VGammaDeexcitation::SetNucleus(const G4Fragment& nucleus) |
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138 | { |
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139 | _nucleus = G4Fragment(nucleus); |
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140 | } |
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141 | |
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142 | |
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143 | G4Fragment* G4VGammaDeexcitation::GenerateGamma() |
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144 | { |
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145 | G4double eGamma = 0.; |
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146 | |
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147 | if (_transition != 0) { |
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148 | _transition->SelectGamma(); // it can be conversion electron too |
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149 | eGamma = _transition->GetGammaEnergy(); |
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150 | } |
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151 | if (_verbose > 1 && _transition != 0 ) |
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152 | { |
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153 | G4cout << "G4VGammaDeexcitation::GenerateGamma - Gamma energy " << eGamma |
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154 | << " ** New excitation " << _nucleus.GetExcitationEnergy() - eGamma |
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155 | << G4endl; |
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156 | } |
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157 | |
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158 | // Photon momentum isotropically generated |
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159 | // the same for electron |
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160 | |
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161 | if (eGamma > 0.) |
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162 | { |
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163 | G4double cosTheta = 1. - 2. * G4UniformRand(); |
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164 | G4double sinTheta = std::sqrt(1. - cosTheta * cosTheta); |
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165 | G4double phi = twopi * G4UniformRand(); |
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166 | G4double pM = eGamma; |
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167 | G4DiscreteGammaTransition* dtransition = 0; |
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168 | dtransition = dynamic_cast <G4DiscreteGammaTransition*> (_transition); |
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169 | if ( dtransition && !( dtransition->IsAGamma()) ) { |
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170 | G4double eMass = G4Electron::ElectronDefinition()->GetPDGMass(); |
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171 | pM =std::sqrt(eGamma*(eGamma + 2.0*eMass)); |
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172 | eGamma = eGamma + eMass; |
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173 | } |
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174 | G4ThreeVector pGamma( pM * sinTheta * std::cos(phi), |
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175 | pM * sinTheta * std::sin(phi), |
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176 | pM * cosTheta ); |
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177 | G4LorentzVector gamma(pGamma, eGamma); |
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178 | // gamma.boost(_nucleus.GetMomentum().boostVector() ); |
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179 | G4Fragment* gammaFragment ; |
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180 | if ( dtransition && !(dtransition->IsAGamma()) ){ |
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181 | gammaFragment = new G4Fragment(gamma,G4Electron::ElectronDefinition()); |
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182 | } else { |
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183 | gammaFragment = new G4Fragment(gamma,G4Gamma::GammaDefinition()); |
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184 | } |
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185 | G4double gammaTime = _transition->GetGammaCreationTime(); |
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186 | gammaTime += _nucleus.GetCreationTime(); |
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187 | gammaFragment->SetCreationTime(gammaTime); |
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188 | |
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189 | if (_verbose > 1 && dtransition ) |
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190 | G4cout << "G4VGammaDeexcitation::GenerateGamma - Gamma fragment generated: " |
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191 | << (dtransition->IsAGamma() ? " Gamma" : " Electron" ) << G4endl; |
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192 | return gammaFragment; |
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193 | } |
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194 | else |
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195 | { |
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196 | return 0; |
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197 | } |
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198 | } |
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199 | |
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200 | void G4VGammaDeexcitation::UpdateNucleus(const G4Fragment* gamma) |
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201 | { |
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202 | G4LorentzVector p4Gamma = gamma->GetMomentum(); |
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203 | G4ThreeVector pGamma(p4Gamma.vect()); |
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204 | |
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205 | G4double eGamma = 0.; |
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206 | if (_transition != 0) |
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207 | eGamma = _transition->GetGammaEnergy(); |
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208 | G4DiscreteGammaTransition* dtransition = 0; |
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209 | dtransition = dynamic_cast <G4DiscreteGammaTransition*> (_transition); |
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210 | if (dtransition && !(dtransition->IsAGamma()) ) |
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211 | eGamma += dtransition->GetBondEnergy(); |
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212 | |
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213 | G4LorentzVector p4Nucleus(_nucleus.GetMomentum() ); |
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214 | |
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215 | // New tetravector calculation: |
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216 | |
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217 | // G4double Mass = G4ParticleTable::GetParticleTable()->GetIonTable()->GetIonMass(_nucleus.GetZ(),_nucleus.GetA()); |
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218 | G4double m1 = G4ParticleTable::GetParticleTable()->GetIonTable()->GetIonMass(static_cast<G4int>(_nucleus.GetZ()), |
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219 | static_cast<G4int>(_nucleus.GetA())); |
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220 | G4double m2 = _nucleus.GetZ() * G4Proton::Proton()->GetPDGMass() + |
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221 | (_nucleus.GetA()- _nucleus.GetZ())*G4Neutron::Neutron()->GetPDGMass(); |
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222 | |
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223 | G4double Mass = std::min(m1,m2); |
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224 | |
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225 | |
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226 | G4double newExcitation = p4Nucleus.mag() - Mass - eGamma; |
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227 | if(newExcitation < 0) |
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228 | newExcitation = 0; |
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229 | |
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230 | G4ThreeVector p3Residual(p4Nucleus.vect() - pGamma); |
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231 | G4double newEnergy = std::sqrt(p3Residual * p3Residual + |
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232 | (Mass + newExcitation) * (Mass + newExcitation)); |
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233 | G4LorentzVector p4Residual(p3Residual, newEnergy); |
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234 | |
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235 | // G4LorentzVector p4Residual(-pGamma, p4Nucleus.e() - eGamma); |
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236 | // p4Residual.boost( _nucleus.GetMomentum().boostVector() ); |
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237 | |
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238 | // Update excited nucleus parameters |
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239 | |
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240 | _nucleus.SetMomentum(p4Residual); |
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241 | _nucleus.SetCreationTime(gamma->GetCreationTime()); |
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242 | |
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243 | // if (_transition != 0) |
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244 | // { |
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245 | // G4double excitation =_transition->GetEnergyTo(); |
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246 | // if (excitation < 0.) excitation = 0.0; |
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247 | // _nucleus.SetExcitationEnergy(excitation); |
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248 | // } |
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249 | |
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250 | return; |
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251 | } |
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252 | |
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253 | void G4VGammaDeexcitation::UpdateElectrons( ) |
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254 | { |
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255 | G4DiscreteGammaTransition* dtransition = 0; |
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256 | dtransition = dynamic_cast <G4DiscreteGammaTransition*> (_transition); |
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257 | if (dtransition && !(dtransition->IsAGamma()) ) { |
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258 | |
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259 | _vSN = dtransition->GetOrbitNumber(); |
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260 | _electronO.RemoveElectron(_vSN); |
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261 | } |
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262 | return; |
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263 | } |
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264 | |
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265 | void G4VGammaDeexcitation::Update() |
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266 | { |
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267 | if (_transition != 0) |
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268 | { |
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269 | delete _transition; |
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270 | _transition = 0; |
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271 | if (_verbose > 1) |
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272 | G4cout << "G4VGammaDeexcitation::Update - Transition deleted " << G4endl; |
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273 | } |
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274 | |
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275 | _transition = CreateTransition(); |
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276 | if (_transition != 0) |
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277 | { |
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278 | _transition->SetEnergyFrom(_nucleus.GetExcitationEnergy()); |
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279 | // if ( _vSN != -1) (dynamic_cast <G4DiscreteGammaTransition*> (_transition))->SetICM(false); |
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280 | // the above line is commented out for bug fix #952. It was intruduced for reason that |
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281 | // the k-shell electron is most likely one to be kicked out and there is no time for |
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282 | // the atom to deexcite before the next IC. But this limitation is causing other problems as |
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283 | // reported in #952 |
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284 | } |
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285 | |
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286 | return; |
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287 | } |
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288 | |
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289 | |
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290 | void G4VGammaDeexcitation::Initialize() |
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291 | { |
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292 | _transition = CreateTransition(); |
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293 | if (_transition != 0) { |
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294 | _transition->SetEnergyFrom(_nucleus.GetExcitationEnergy()); |
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295 | } |
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296 | return; |
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297 | } |
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298 | |
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299 | |
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300 | void G4VGammaDeexcitation::SetVerboseLevel(G4int verbose) |
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301 | { |
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302 | _verbose = verbose; |
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303 | return; |
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304 | } |
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305 | |
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306 | |
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307 | |
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308 | |
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309 | |
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310 | |
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