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 | // $Id: G4FinalStateChargeDecrease.cc,v 1.2 2007/11/09 20:11:04 pia Exp $ |
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28 | // GEANT4 tag $Name: $ |
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29 | // |
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30 | // Contact Author: Maria Grazia Pia (Maria.Grazia.Pia@cern.ch) |
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31 | // |
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32 | // Reference: TNS Geant4-DNA paper |
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33 | // Reference for implementation model: NIM. 155, pp. 145-156, 1978 |
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34 | |
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35 | // History: |
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36 | // ----------- |
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37 | // Date Name Modification |
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38 | // 28 Apr 2007 M.G. Pia Created in compliance with design described in TNS paper |
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39 | // |
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40 | // ------------------------------------------------------------------- |
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41 | |
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42 | // Class description: |
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43 | // Reference: TNS Geant4-DNA paper |
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44 | // S. Chauvie et al., Geant4 physics processes for microdosimetry simulation: |
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45 | // design foundation and implementation of the first set of models, |
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46 | // IEEE Trans. Nucl. Sci., vol. 54, no. 6, Dec. 2007. |
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47 | // Further documentation available from http://www.ge.infn.it/geant4/dna |
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48 | |
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49 | // ------------------------------------------------------------------- |
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50 | |
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51 | |
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52 | #include "G4FinalStateChargeDecrease.hh" |
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53 | #include "G4Track.hh" |
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54 | #include "G4Step.hh" |
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55 | #include "G4DynamicParticle.hh" |
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56 | //#include "Randomize.hh" |
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57 | |
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58 | #include "G4ParticleTypes.hh" |
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59 | #include "G4ParticleDefinition.hh" |
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60 | #include "G4SystemOfUnits.hh" |
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61 | //#include "G4ParticleMomentum.hh" |
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62 | #include "G4DNAGenericIonsManager.hh" |
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63 | |
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64 | G4FinalStateChargeDecrease::G4FinalStateChargeDecrease() |
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65 | { |
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66 | name = "ChargeDecrease"; |
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67 | lowEnergyLimit = 1 * keV; |
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68 | highEnergyLimit = 10 * MeV; |
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69 | } |
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70 | |
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71 | |
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72 | G4FinalStateChargeDecrease::~G4FinalStateChargeDecrease() |
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73 | {} |
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74 | |
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75 | |
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76 | const G4FinalStateProduct& G4FinalStateChargeDecrease::GenerateFinalState(const G4Track& track, const G4Step& /* step */) |
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77 | { |
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78 | // Clear previous secondaries, energy deposit and particle kill status |
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79 | product.Clear(); |
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80 | |
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81 | G4double inK = track.GetDynamicParticle()->GetKineticEnergy(); |
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82 | |
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83 | G4ParticleDefinition* definition = track.GetDefinition(); |
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84 | G4int finalStateIndex = cross.RandomSelect(inK,definition); |
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85 | |
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86 | G4int n = NumberOfFinalStates(definition, finalStateIndex); |
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87 | G4double waterBindingEnergy = WaterBindingEnergyConstant(definition, finalStateIndex); |
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88 | G4double outgoingParticleBindingEnergy = OutgoingParticleBindingEnergyConstant(definition, finalStateIndex); |
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89 | |
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90 | G4double outK = 0.; |
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91 | if (definition==G4Proton::Proton()) |
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92 | outK = inK - n*(inK*electron_mass_c2/proton_mass_c2) - waterBindingEnergy + outgoingParticleBindingEnergy; |
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93 | else |
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94 | outK = inK - n*(inK*electron_mass_c2/(3728*MeV)) - waterBindingEnergy + outgoingParticleBindingEnergy; |
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95 | |
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96 | if (outK<0) |
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97 | { |
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98 | G4String message; |
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99 | message="ChargeDecreaseDingfelder::GenerateFinalState - Final kinetic energy is below 0! Process "; |
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100 | G4Exception(message); |
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101 | } |
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102 | |
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103 | // Primary particle |
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104 | product.KillPrimaryParticle(); |
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105 | product.AddEnergyDeposit(waterBindingEnergy); |
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106 | |
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107 | //Secondary particle |
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108 | G4DynamicParticle* aSecondary = new G4DynamicParticle(OutgoingParticleDefinition(definition, finalStateIndex), |
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109 | track.GetDynamicParticle()->GetMomentumDirection(), |
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110 | outK); |
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111 | |
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112 | product.AddSecondary(aSecondary); |
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113 | |
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114 | return product; |
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115 | } |
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116 | |
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117 | G4int G4FinalStateChargeDecrease::NumberOfFinalStates(G4ParticleDefinition* particleDefinition, |
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118 | G4int finalStateIndex ) |
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119 | |
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120 | { |
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121 | if (particleDefinition == G4Proton::Proton()) return 1; |
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122 | |
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123 | G4DNAGenericIonsManager*instance; |
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124 | instance = G4DNAGenericIonsManager::Instance(); |
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125 | |
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126 | if (particleDefinition == instance->GetIon("alpha++") ) |
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127 | { |
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128 | if (finalStateIndex==0) return 1; |
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129 | return 2; |
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130 | } |
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131 | |
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132 | if (particleDefinition == instance->GetIon("alpha+") ) return 1; |
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133 | |
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134 | return 0; |
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135 | } |
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136 | |
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137 | |
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138 | G4ParticleDefinition* G4FinalStateChargeDecrease::OutgoingParticleDefinition (G4ParticleDefinition* particleDefinition, |
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139 | G4int finalStateIndex) |
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140 | { |
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141 | G4DNAGenericIonsManager * instance(G4DNAGenericIonsManager::Instance()); |
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142 | |
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143 | if (particleDefinition == G4Proton::Proton()) return instance->GetIon("hydrogen"); |
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144 | |
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145 | if (particleDefinition == instance->GetIon("alpha++") ) |
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146 | { |
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147 | if (finalStateIndex == 0) return instance->GetIon("alpha+"); |
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148 | |
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149 | return instance->GetIon("helium"); |
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150 | } |
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151 | |
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152 | if (particleDefinition == instance->GetIon("alpha+") ) return instance->GetIon("helium"); |
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153 | |
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154 | return 0; |
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155 | } |
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156 | |
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157 | |
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158 | G4double G4FinalStateChargeDecrease::WaterBindingEnergyConstant(G4ParticleDefinition* particleDefinition, |
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159 | G4int finalStateIndex ) |
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160 | { |
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161 | // Ionization energy of first water shell |
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162 | // Rad. Phys. Chem. 59 p.267 by Dingf. et al. |
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163 | // W + 10.79 eV -> W+ + e- |
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164 | |
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165 | G4DNAGenericIonsManager * instance(G4DNAGenericIonsManager::Instance()); |
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166 | |
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167 | if(particleDefinition == G4Proton::Proton()) return 10.79*eV; |
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168 | |
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169 | if (particleDefinition == instance->GetIon("alpha++") ) |
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170 | { |
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171 | // Binding energy for W+ -> W++ + e- 10.79 eV |
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172 | // Binding energy for W -> W+ + e- 10.79 eV |
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173 | // |
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174 | // Ionization energy of first water shell |
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175 | // Rad. Phys. Chem. 59 p.267 by Dingf. et al. |
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176 | |
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177 | if (finalStateIndex == 0) return 10.79*eV; |
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178 | |
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179 | return 10.79*2*eV; |
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180 | } |
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181 | |
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182 | if (particleDefinition == instance->GetIon("alpha+") ) |
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183 | { |
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184 | // Binding energy for W+ -> W++ + e- 10.79 eV |
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185 | // Binding energy for W -> W+ + e- 10.79 eV |
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186 | // |
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187 | // Ionization energy of first water shell |
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188 | // Rad. Phys. Chem. 59 p.267 by Dingf. et al. |
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189 | |
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190 | return 10.79*eV; |
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191 | } |
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192 | |
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193 | return 0; |
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194 | } |
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195 | |
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196 | |
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197 | G4double G4FinalStateChargeDecrease::OutgoingParticleBindingEnergyConstant(G4ParticleDefinition* particleDefinition, |
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198 | G4int finalStateIndex) |
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199 | { |
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200 | G4DNAGenericIonsManager * instance(G4DNAGenericIonsManager::Instance()); |
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201 | |
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202 | if(particleDefinition == G4Proton::Proton()) return 13.6*eV; |
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203 | |
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204 | if (particleDefinition == instance->GetIon("alpha++") ) |
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205 | { |
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206 | // Binding energy for He+ -> He++ + e- 54.509 eV |
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207 | // Binding energy for He -> He+ + e- 24.587 eV |
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208 | |
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209 | if (finalStateIndex==0) return 54.509*eV; |
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210 | |
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211 | return (54.509 + 24.587)*eV; |
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212 | } |
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213 | |
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214 | if (particleDefinition == instance->GetIon("alpha+") ) |
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215 | { |
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216 | // Binding energy for He+ -> He++ + e- 54.509 eV |
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217 | // Binding energy for He -> He+ + e- 24.587 eV |
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218 | |
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219 | return 24.587*eV; |
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220 | } |
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221 | |
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222 | return 0; |
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223 | } |
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224 | |
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