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 | // * * |
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21 | // * Parts of this code which have been developed by QinetiQ Ltd * |
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22 | // * under contract to the European Space Agency (ESA) are the * |
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23 | // * intellectual property of ESA. Rights to use, copy, modify and * |
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24 | // * redistribute this software for general public use are granted * |
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25 | // * in compliance with any licensing, distribution and development * |
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26 | // * policy adopted by the Geant4 Collaboration. This code has been * |
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27 | // * written by QinetiQ Ltd for the European Space Agency, under ESA * |
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28 | // * contract 17191/03/NL/LvH (Aurora Programme). * |
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29 | // * * |
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30 | // * By using, copying, modifying or distributing the software (or * |
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31 | // * any work based on the software) you agree to acknowledge its * |
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32 | // * use in resulting scientific publications, and indicate your * |
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33 | // * acceptance of all terms of the Geant4 Software license. * |
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34 | // ******************************************************************** |
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35 | // |
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36 | // %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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37 | // |
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38 | // MODULE: G4EMDissociation.cc |
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39 | // |
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40 | // Version: B.1 |
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41 | // Date: 15/04/04 |
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42 | // Author: P R Truscott |
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43 | // Organisation: QinetiQ Ltd, UK |
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44 | // Customer: ESA/ESTEC, NOORDWIJK |
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45 | // Contract: 17191/03/NL/LvH |
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46 | // |
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47 | // %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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48 | // |
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49 | // CHANGE HISTORY |
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50 | // -------------- |
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51 | // |
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52 | // 17 October 2003, P R Truscott, QinetiQ Ltd, UK |
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53 | // Created. |
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54 | // |
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55 | // 15 March 2004, P R Truscott, QinetiQ Ltd, UK |
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56 | // Beta release |
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57 | // |
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58 | // %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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59 | //////////////////////////////////////////////////////////////////////////////// |
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60 | // |
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61 | #include "G4EMDissociation.hh" |
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62 | #include "G4Evaporation.hh" |
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63 | #include "G4FermiBreakUp.hh" |
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64 | #include "G4StatMF.hh" |
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65 | #include "G4ParticleDefinition.hh" |
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66 | #include "G4LorentzVector.hh" |
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67 | #include "G4PhysicsFreeVector.hh" |
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68 | #include "G4EMDissociationCrossSection.hh" |
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69 | #include "G4Proton.hh" |
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70 | #include "G4Neutron.hh" |
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71 | #include "G4ParticleTable.hh" |
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72 | #include "G4IonTable.hh" |
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73 | #include "G4GeneralPhaseSpaceDecay.hh" |
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74 | #include "G4DecayProducts.hh" |
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75 | #include "G4DynamicParticle.hh" |
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76 | #include "G4Fragment.hh" |
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77 | #include "G4ReactionProductVector.hh" |
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78 | #include "Randomize.hh" |
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79 | #include "globals.hh" |
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80 | //////////////////////////////////////////////////////////////////////////////// |
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81 | // |
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82 | G4EMDissociation::G4EMDissociation():G4HadronicInteraction("EMDissociation") |
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83 | { |
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84 | // |
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85 | // |
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86 | // Send message to stdout to advise that the G4EMDissociation model is being |
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87 | // used. |
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88 | // |
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89 | PrintWelcomeMessage(); |
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90 | // |
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91 | // |
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92 | // No de-excitation handler has been supplied - define the default handler. |
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93 | // |
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94 | theExcitationHandler = new G4ExcitationHandler; |
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95 | G4Evaporation * theEvaporation = new G4Evaporation; |
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96 | G4FermiBreakUp * theFermiBreakUp = new G4FermiBreakUp; |
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97 | G4StatMF * theMF = new G4StatMF; |
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98 | theExcitationHandler->SetEvaporation(theEvaporation); |
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99 | theExcitationHandler->SetFermiModel(theFermiBreakUp); |
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100 | theExcitationHandler->SetMultiFragmentation(theMF); |
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101 | theExcitationHandler->SetMaxAandZForFermiBreakUp(12, 6); |
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102 | theExcitationHandler->SetMinEForMultiFrag(5.0*MeV); |
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103 | handlerDefinedInternally = true; |
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104 | // |
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105 | // |
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106 | // This EM dissociation model needs access to the cross-sections held in |
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107 | // G4EMDissociationCrossSection. |
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108 | // |
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109 | dissociationCrossSection = new G4EMDissociationCrossSection; |
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110 | thePhotonSpectrum = new G4EMDissociationSpectrum; |
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111 | // |
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112 | // |
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113 | // Set the minimum and maximum range for the model (despite nomanclature, this |
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114 | // is in energy per nucleon number). |
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115 | // |
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116 | SetMinEnergy(100.0*MeV); |
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117 | SetMaxEnergy(500.0*GeV); |
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118 | // |
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119 | // |
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120 | // Set the default verbose level to 0 - no output. |
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121 | // |
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122 | verboseLevel = 0; |
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123 | } |
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124 | //////////////////////////////////////////////////////////////////////////////// |
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125 | // |
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126 | G4EMDissociation::G4EMDissociation (G4ExcitationHandler *aExcitationHandler) |
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127 | { |
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128 | // |
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129 | // |
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130 | // Send message to stdout to advise that the G4EMDissociation model is being |
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131 | // used. |
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132 | // |
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133 | PrintWelcomeMessage(); |
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134 | |
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135 | theExcitationHandler = aExcitationHandler; |
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136 | handlerDefinedInternally = false; |
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137 | // |
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138 | // |
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139 | // This EM dissociation model needs access to the cross-sections held in |
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140 | // G4EMDissociationCrossSection. |
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141 | // |
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142 | dissociationCrossSection = new G4EMDissociationCrossSection; |
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143 | thePhotonSpectrum = new G4EMDissociationSpectrum; |
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144 | // |
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145 | // |
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146 | // Set the minimum and maximum range for the model (despite nomanclature, this |
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147 | // is in energy per nucleon number). |
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148 | // |
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149 | SetMinEnergy(100.0*MeV); |
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150 | SetMaxEnergy(500.0*GeV); |
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151 | // |
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152 | // |
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153 | // Set the default verbose level to 0 - no output. |
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154 | // |
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155 | verboseLevel = 0; |
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156 | } |
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157 | //////////////////////////////////////////////////////////////////////////////// |
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158 | // |
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159 | G4EMDissociation::~G4EMDissociation () |
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160 | { |
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161 | if (handlerDefinedInternally) delete theExcitationHandler; |
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162 | delete dissociationCrossSection; |
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163 | delete thePhotonSpectrum; |
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164 | } |
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165 | //////////////////////////////////////////////////////////////////////////////// |
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166 | // |
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167 | G4HadFinalState *G4EMDissociation::ApplyYourself |
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168 | (const G4HadProjectile &theTrack, G4Nucleus &theTarget) |
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169 | { |
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170 | // |
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171 | // |
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172 | // The secondaries will be returned in G4HadFinalState &theParticleChange - |
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173 | // initialise this. |
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174 | // |
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175 | theParticleChange.Clear(); |
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176 | theParticleChange.SetStatusChange(stopAndKill); |
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177 | // |
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178 | // |
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179 | // Get relevant information about the projectile and target (A, Z) and |
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180 | // energy/nuc, momentum, velocity, Lorentz factor and rest-mass of the |
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181 | // projectile. |
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182 | // |
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183 | const G4ParticleDefinition *definitionP = theTrack.GetDefinition(); |
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184 | const G4double AP = definitionP->GetBaryonNumber(); |
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185 | const G4double ZP = definitionP->GetPDGCharge(); |
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186 | G4LorentzVector pP = theTrack.Get4Momentum(); |
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187 | G4double E = theTrack.GetKineticEnergy()/AP; |
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188 | G4double MP = theTrack.GetTotalEnergy() - E*AP; |
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189 | G4double b = pP.beta(); |
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190 | G4double AT = theTarget.GetN(); |
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191 | G4double ZT = theTarget.GetZ(); |
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192 | G4double MT = G4NucleiProperties::GetNuclearMass(AT,ZT); |
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193 | // |
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194 | // |
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195 | // Depending upon the verbosity level, output the initial information on the |
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196 | // projectile and target. |
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197 | // |
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198 | if (verboseLevel >= 2) |
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199 | { |
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200 | G4cout.precision(6); |
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201 | G4cout <<"########################################" |
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202 | <<"########################################" |
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203 | <<G4endl; |
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204 | G4cout <<"IN G4EMDissociation" <<G4endl; |
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205 | G4cout <<"Initial projectile A=" <<AP |
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206 | <<", Z=" <<ZP |
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207 | <<G4endl; |
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208 | G4cout <<"Initial target A=" <<AT |
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209 | <<", Z=" <<ZT |
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210 | <<G4endl; |
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211 | G4cout <<"Projectile momentum and Energy/nuc = " <<pP <<" ," <<E <<G4endl; |
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212 | } |
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213 | // |
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214 | // |
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215 | // Initialise the variables which will be used with the phase-space decay and |
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216 | // to boost the secondaries from the interaction. |
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217 | // |
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218 | G4ParticleDefinition *typeNucleon = NULL; |
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219 | G4ParticleDefinition *typeDaughter = NULL; |
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220 | G4double Eg = 0.0; |
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221 | G4double mass = 0.0; |
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222 | G4ThreeVector boost = G4ThreeVector(0.0, 0.0, 0.0); |
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223 | // |
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224 | // |
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225 | // Determine the cross-sections at the giant dipole and giant quadrupole |
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226 | // resonance energies for the projectile and then target. The information is |
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227 | // initially provided in the G4PhysicsFreeVector individually for the E1 |
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228 | // and E2 fields. These are then summed. |
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229 | // |
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230 | G4double bmin = thePhotonSpectrum->GetClosestApproach(AP, ZP, AT, ZT, b); |
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231 | G4PhysicsFreeVector *crossSectionP = dissociationCrossSection-> |
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232 | GetCrossSectionForProjectile(AP, ZP, AT, ZT, b, bmin); |
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233 | G4PhysicsFreeVector *crossSectionT = dissociationCrossSection-> |
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234 | GetCrossSectionForTarget(AP, ZP, AT, ZT, b, bmin); |
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235 | |
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236 | G4double totCrossSectionP = (*crossSectionP)[0]+(*crossSectionP)[1]; |
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237 | G4double totCrossSectionT = (*crossSectionT)[0]+(*crossSectionT)[1]; |
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238 | // |
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239 | // |
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240 | // Now sample whether the interaction involved EM dissociation of the projectile |
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241 | // or the target. |
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242 | // |
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243 | if (G4UniformRand() < |
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244 | totCrossSectionP / (totCrossSectionP + totCrossSectionT)) |
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245 | { |
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246 | // |
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247 | // |
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248 | // It was the projectile which underwent EM dissociation. Define the Lorentz |
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249 | // boost to be applied to the secondaries, and sample whether a proton or a |
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250 | // neutron was ejected. Then determine the energy of the virtual gamma ray |
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251 | // which passed from the target nucleus ... this will be used to define the |
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252 | // excitation of the projectile. |
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253 | // |
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254 | mass = MP; |
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255 | if (G4UniformRand() < dissociationCrossSection-> |
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256 | GetWilsonProbabilityForProtonDissociation (AP, ZP)) |
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257 | { |
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258 | if (verboseLevel >= 2) |
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259 | G4cout <<"Projectile underwent EM dissociation producing a proton" |
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260 | <<G4endl; |
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261 | typeNucleon = G4Proton::ProtonDefinition(); |
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262 | typeDaughter = G4ParticleTable::GetParticleTable()-> |
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263 | GetIon((G4int) ZP-1, (G4int) AP-1, 0.0); |
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264 | } |
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265 | else |
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266 | { |
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267 | if (verboseLevel >= 2) |
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268 | G4cout <<"Projectile underwent EM dissociation producing a neutron" |
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269 | <<G4endl; |
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270 | typeNucleon = G4Neutron::NeutronDefinition(); |
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271 | typeDaughter = G4ParticleTable::GetParticleTable()-> |
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272 | GetIon((G4int) ZP, (G4int) AP-1, 0.0); |
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273 | } |
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274 | if (G4UniformRand() < (*crossSectionP)[0]/totCrossSectionP) |
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275 | { |
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276 | Eg = crossSectionP->GetLowEdgeEnergy(0); |
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277 | if (verboseLevel >= 2) |
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278 | G4cout <<"Transition type was E1" <<G4endl; |
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279 | } |
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280 | else |
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281 | { |
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282 | Eg = crossSectionP->GetLowEdgeEnergy(1); |
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283 | if (verboseLevel >= 2) |
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284 | G4cout <<"Transition type was E2" <<G4endl; |
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285 | } |
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286 | // |
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287 | // |
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288 | // We need to define a Lorentz vector with the original momentum, but total |
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289 | // energy includes the projectile and virtual gamma. This is then used |
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290 | // to calculate the boost required for the secondaries. |
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291 | // |
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292 | pP.setE(pP.e()+Eg); |
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293 | boost = pP.findBoostToCM(); |
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294 | } |
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295 | else |
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296 | { |
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297 | // |
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298 | // |
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299 | // It was the target which underwent EM dissociation. Sample whether a |
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300 | // proton or a neutron was ejected. Then determine the energy of the virtual |
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301 | // gamma ray which passed from the projectile nucleus ... this will be used to |
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302 | // define the excitation of the target. |
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303 | // |
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304 | mass = MT; |
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305 | if (G4UniformRand() < dissociationCrossSection-> |
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306 | GetWilsonProbabilityForProtonDissociation (AT, ZT)) |
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307 | { |
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308 | if (verboseLevel >= 2) |
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309 | G4cout <<"Target underwent EM dissociation producing a proton" |
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310 | <<G4endl; |
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311 | typeNucleon = G4Proton::ProtonDefinition(); |
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312 | typeDaughter = G4ParticleTable::GetParticleTable()-> |
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313 | GetIon((G4int) ZT-1, (G4int) AT-1, 0.0); |
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314 | } |
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315 | else |
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316 | { |
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317 | if (verboseLevel >= 2) |
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318 | G4cout <<"Target underwent EM dissociation producing a neutron" |
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319 | <<G4endl; |
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320 | typeNucleon = G4Neutron::NeutronDefinition(); |
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321 | typeDaughter = G4ParticleTable::GetParticleTable()-> |
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322 | GetIon((G4int) ZT, (G4int) AT-1, 0.0); |
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323 | } |
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324 | if (G4UniformRand() < (*crossSectionT)[0]/totCrossSectionT) |
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325 | { |
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326 | Eg = crossSectionT->GetLowEdgeEnergy(0); |
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327 | if (verboseLevel >= 2) |
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328 | G4cout <<"Transition type was E1" <<G4endl; |
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329 | } |
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330 | else |
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331 | { |
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332 | Eg = crossSectionT->GetLowEdgeEnergy(1); |
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333 | if (verboseLevel >= 2) |
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334 | G4cout <<"Transition type was E2" <<G4endl; |
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335 | } |
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336 | // |
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337 | // |
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338 | // Add the projectile to theParticleChange, less the energy of the |
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339 | // not-so-virtual gamma-ray. Not that at the moment, no lateral momentum |
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340 | // is transferred between the projectile and target nuclei. |
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341 | // |
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342 | G4ThreeVector v = pP.vect(); |
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343 | v.setMag(1.0); |
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344 | G4DynamicParticle *changedP = new G4DynamicParticle |
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345 | (const_cast<G4ParticleDefinition*>(definitionP), v, E*AP-Eg); |
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346 | theParticleChange.AddSecondary (changedP); |
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347 | if (verboseLevel >= 2) |
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348 | { |
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349 | G4cout <<"Projectile change:" <<G4endl; |
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350 | changedP->DumpInfo(); |
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351 | } |
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352 | } |
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353 | // |
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354 | // |
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355 | // Perform a two-body decay based on the restmass energy of the parent and |
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356 | // gamma-ray, and the masses of the daughters. In the frame of reference of |
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357 | // the nucles, the angular distribution is sampled isotropically, but the |
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358 | // the nucleon and secondary nucleus are boosted if they've come from the |
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359 | // projectile. |
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360 | // |
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361 | G4double e = mass + Eg; |
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362 | G4double m1 = typeNucleon->GetPDGMass(); |
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363 | G4double m2 = typeDaughter->GetPDGMass(); |
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364 | G4double pp = (e+m1+m2)*(e+m1-m2)*(e-m1+m2)*(e-m1-m2)/(4.0*e*e); |
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365 | if (pp < 0.0) |
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366 | { |
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367 | pp = 1.0*eV; |
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368 | // if (verboseLevel >`= 1) |
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369 | // { |
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370 | // G4cout <<"IN G4EMDissociation::ApplyYoursef" <<G4endl; |
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371 | // G4cout <<"Error in mass of secondaries compared with primary:" <<G4endl; |
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372 | // G4cout <<"Rest mass of primary = " <<mass <<" MeV" <<G4endl; |
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373 | // G4cout <<"Virtual gamma energy = " <<Eg <<" MeV" <<G4endl; |
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374 | // G4cout <<"Rest mass of secondary #1 = " <<m1 <<" MeV" <<G4endl; |
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375 | // G4cout <<"Rest mass of secondary #2 = " <<m2 <<" MeV" <<G4endl; |
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376 | // } |
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377 | } |
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378 | else |
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379 | pp = std::sqrt(pp); |
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380 | G4double costheta = 2.*G4UniformRand()-1.0; |
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381 | G4double sintheta = std::sqrt((1.0 - costheta)*(1.0 + costheta)); |
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382 | G4double phi = 2.0*pi*G4UniformRand()*rad; |
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383 | G4ThreeVector direction(sintheta*std::cos(phi),sintheta*std::sin(phi),costheta); |
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384 | G4DynamicParticle *dynamicNucleon = |
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385 | new G4DynamicParticle(typeNucleon, direction*pp); |
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386 | dynamicNucleon->Set4Momentum(dynamicNucleon->Get4Momentum().boost(-boost)); |
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387 | G4DynamicParticle *dynamicDaughter = |
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388 | new G4DynamicParticle(typeDaughter, -direction*pp); |
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389 | dynamicDaughter->Set4Momentum(dynamicDaughter->Get4Momentum().boost(-boost)); |
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390 | // |
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391 | // |
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392 | // The "decay" products have to be transferred to the G4HadFinalState object. |
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393 | // Furthermore, the residual nucleus should be de-excited. |
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394 | // |
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395 | theParticleChange.AddSecondary (dynamicNucleon); |
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396 | if (verboseLevel >= 2) |
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397 | { |
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398 | G4cout <<"Nucleon from the EMD process:" <<G4endl; |
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399 | dynamicNucleon->DumpInfo(); |
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400 | } |
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401 | |
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402 | G4Fragment *theFragment = new |
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403 | G4Fragment((G4int) typeDaughter->GetBaryonNumber(), |
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404 | (G4int) typeDaughter->GetPDGCharge(), dynamicDaughter->Get4Momentum()); |
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405 | if (verboseLevel >= 2) |
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406 | { |
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407 | G4cout <<"Dynamic properties of the prefragment:" <<G4endl; |
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408 | G4cout.precision(6); |
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409 | dynamicDaughter->DumpInfo(); |
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410 | G4cout <<"Nuclear properties of the prefragment:" <<G4endl; |
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411 | G4cout <<theFragment <<G4endl; |
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412 | } |
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413 | G4ReactionProductVector *products = |
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414 | theExcitationHandler->BreakItUp(*theFragment); |
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415 | delete theFragment; |
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416 | theFragment = NULL; |
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417 | |
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418 | G4ReactionProductVector::iterator iter; |
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419 | for (iter = products->begin(); iter != products->end(); ++iter) |
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420 | { |
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421 | G4DynamicParticle *secondary = |
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422 | new G4DynamicParticle((*iter)->GetDefinition(), |
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423 | (*iter)->GetTotalEnergy(), (*iter)->GetMomentum()); |
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424 | theParticleChange.AddSecondary (secondary); |
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425 | } |
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426 | |
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427 | if (verboseLevel >= 2) |
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428 | G4cout <<"########################################" |
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429 | <<"########################################" |
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430 | <<G4endl; |
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431 | |
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432 | return &theParticleChange; |
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433 | } |
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434 | //////////////////////////////////////////////////////////////////////////////// |
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435 | // |
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436 | void G4EMDissociation::PrintWelcomeMessage () |
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437 | { |
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438 | G4cout <<G4endl; |
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439 | G4cout <<" ****************************************************************" |
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440 | <<G4endl; |
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441 | G4cout <<" EM dissociation model for nuclear-nuclear interactions activated" |
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442 | <<G4endl; |
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443 | G4cout <<" (Written by QinetiQ Ltd for the European Space Agency)" |
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444 | <<G4endl; |
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445 | G4cout <<" ****************************************************************" |
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446 | <<G4endl; |
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447 | G4cout << G4endl; |
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448 | |
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449 | return; |
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450 | } |
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451 | //////////////////////////////////////////////////////////////////////////////// |
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452 | // |
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