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: G4Decay.cc,v 1.30 2008/09/19 03:19:53 kurasige Exp $ |
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28 | // GEANT4 tag $Name: geant4-09-03 $ |
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29 | // |
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30 | // |
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31 | // -------------------------------------------------------------- |
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32 | // GEANT 4 class implementation file |
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33 | // |
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34 | // History: first implementation, based on object model of |
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35 | // 2nd December 1995, G.Cosmo |
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36 | // 7 July 1996 H.Kurashige |
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37 | // ------------------------------------------------------------ |
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38 | // remove BuildPhysicsTable() 28 Nov. 1997 H.Kurashige |
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39 | // change DBL_EPSIRON to DBL_MIN 14 Dec. 1997 H.Kurashige |
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40 | // modified for new ParticleChange 12 Mar. 1998 H.Kurashige |
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41 | // modified for "GoodForTrackingFlag" 19 June 1998 H.Kurashige |
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42 | // rename thePhysicsTable to aPhyscisTable 2 Aug. 1998 H.Kurashige |
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43 | // modified IsApplicable in order to protect the decay from registered |
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44 | // to resonances 12 Dec. 1998 H.Kurashige |
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45 | // remove G4ParticleMomentum 6 Feb. 99 H.Kurashige |
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46 | // modified IsApplicable to activate G4Decay for resonances 1 Mar. 00 H.Kurashige |
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47 | // Add External Decayer 23 Feb. 2001 H.Kurashige |
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48 | // change LowestBinValue,HighestBinValue and TotBin(200) 9 Feb. 2002 |
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49 | // |
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50 | |
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51 | #include "G4Decay.hh" |
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52 | #include "G4DynamicParticle.hh" |
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53 | #include "G4DecayProducts.hh" |
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54 | #include "G4DecayTable.hh" |
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55 | #include "G4PhysicsLogVector.hh" |
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56 | #include "G4ParticleChangeForDecay.hh" |
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57 | #include "G4VExtDecayer.hh" |
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58 | |
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59 | // constructor |
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60 | G4Decay::G4Decay(const G4String& processName) |
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61 | :G4VRestDiscreteProcess(processName, fDecay), |
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62 | verboseLevel(1), |
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63 | HighestValue(20.0), |
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64 | pExtDecayer(0) |
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65 | { |
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66 | // set Process Sub Type |
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67 | SetProcessSubType(static_cast<int>(DECAY)); |
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68 | |
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69 | #ifdef G4VERBOSE |
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70 | if (GetVerboseLevel()>1) { |
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71 | G4cout << "G4Decay constructor " << " Name:" << processName << G4endl; |
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72 | } |
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73 | #endif |
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74 | |
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75 | pParticleChange = &fParticleChangeForDecay; |
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76 | } |
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77 | |
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78 | G4Decay::~G4Decay() |
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79 | { |
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80 | if (pExtDecayer) { |
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81 | delete pExtDecayer; |
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82 | } |
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83 | } |
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84 | |
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85 | G4bool G4Decay::IsApplicable(const G4ParticleDefinition& aParticleType) |
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86 | { |
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87 | // check if the particle is stable? |
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88 | if (aParticleType.GetPDGLifeTime() <0.0) { |
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89 | return false; |
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90 | } else if (aParticleType.GetPDGMass() <= 0.0*MeV) { |
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91 | return false; |
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92 | } else { |
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93 | return true; |
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94 | } |
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95 | } |
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96 | |
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97 | G4double G4Decay::GetMeanLifeTime(const G4Track& aTrack , |
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98 | G4ForceCondition*) |
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99 | { |
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100 | // returns the mean free path in GEANT4 internal units |
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101 | G4double meanlife; |
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102 | |
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103 | // get particle |
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104 | const G4DynamicParticle* aParticle = aTrack.GetDynamicParticle(); |
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105 | G4ParticleDefinition* aParticleDef = aParticle->GetDefinition(); |
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106 | G4double aLife = aParticleDef->GetPDGLifeTime(); |
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107 | |
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108 | // check if the particle is stable? |
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109 | if (aParticleDef->GetPDGStable()) { |
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110 | meanlife = DBL_MAX; |
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111 | |
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112 | } else { |
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113 | meanlife = aLife; |
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114 | } |
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115 | |
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116 | #ifdef G4VERBOSE |
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117 | if (GetVerboseLevel()>1) { |
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118 | G4cout << "mean life time: "<< meanlife/ns << "[ns]" << G4endl; |
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119 | } |
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120 | #endif |
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121 | |
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122 | return meanlife; |
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123 | } |
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124 | |
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125 | G4double G4Decay::GetMeanFreePath(const G4Track& aTrack,G4double, G4ForceCondition*) |
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126 | { |
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127 | // get particle |
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128 | const G4DynamicParticle* aParticle = aTrack.GetDynamicParticle(); |
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129 | G4ParticleDefinition* aParticleDef = aParticle->GetDefinition(); |
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130 | G4double aMass = aParticle->GetMass(); |
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131 | G4double aLife = aParticleDef->GetPDGLifeTime(); |
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132 | |
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133 | |
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134 | // returns the mean free path in GEANT4 internal units |
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135 | G4double pathlength; |
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136 | G4double aCtau = c_light * aLife; |
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137 | |
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138 | // check if the particle is stable? |
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139 | if (aParticleDef->GetPDGStable()) { |
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140 | pathlength = DBL_MAX; |
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141 | |
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142 | //check if the particle has very short life time ? |
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143 | } else if (aCtau < DBL_MIN) { |
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144 | pathlength = DBL_MIN; |
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145 | |
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146 | } else { |
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147 | //calculate the mean free path |
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148 | // by using normalized kinetic energy (= Ekin/mass) |
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149 | G4double rKineticEnergy = aParticle->GetKineticEnergy()/aMass; |
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150 | if ( rKineticEnergy > HighestValue) { |
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151 | // gamma >> 1 |
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152 | pathlength = ( rKineticEnergy + 1.0)* aCtau; |
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153 | } else if ( rKineticEnergy < DBL_MIN ) { |
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154 | // too slow particle |
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155 | #ifdef G4VERBOSE |
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156 | if (GetVerboseLevel()>1) { |
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157 | G4cout << "G4Decay::GetMeanFreePath() !!particle stops!!"; |
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158 | G4cout << aParticleDef->GetParticleName() << G4endl; |
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159 | G4cout << "KineticEnergy:" << aParticle->GetKineticEnergy()/GeV <<"[GeV]"; |
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160 | } |
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161 | #endif |
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162 | pathlength = DBL_MIN; |
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163 | } else { |
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164 | // beta <1 |
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165 | pathlength = (aParticle->GetTotalMomentum())/aMass*aCtau ; |
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166 | } |
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167 | } |
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168 | return pathlength; |
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169 | } |
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170 | |
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171 | void G4Decay::BuildPhysicsTable(const G4ParticleDefinition&) |
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172 | { |
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173 | return; |
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174 | } |
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175 | |
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176 | G4VParticleChange* G4Decay::DecayIt(const G4Track& aTrack, const G4Step& ) |
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177 | { |
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178 | // The DecayIt() method returns by pointer a particle-change object. |
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179 | // Units are expressed in GEANT4 internal units. |
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180 | |
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181 | // Initialize ParticleChange |
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182 | // all members of G4VParticleChange are set to equal to |
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183 | // corresponding member in G4Track |
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184 | fParticleChangeForDecay.Initialize(aTrack); |
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185 | |
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186 | // get particle |
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187 | const G4DynamicParticle* aParticle = aTrack.GetDynamicParticle(); |
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188 | G4ParticleDefinition* aParticleDef = aParticle->GetDefinition(); |
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189 | |
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190 | // check if the particle is stable |
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191 | if (aParticleDef->GetPDGStable()) return &fParticleChangeForDecay ; |
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192 | |
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193 | |
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194 | //check if thePreAssignedDecayProducts exists |
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195 | const G4DecayProducts* o_products = (aParticle->GetPreAssignedDecayProducts()); |
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196 | G4bool isPreAssigned = (o_products != 0); |
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197 | G4DecayProducts* products = 0; |
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198 | |
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199 | // decay table |
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200 | G4DecayTable *decaytable = aParticleDef->GetDecayTable(); |
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201 | |
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202 | // check if external decayer exists |
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203 | G4bool isExtDecayer = (decaytable == 0) && (pExtDecayer !=0); |
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204 | |
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205 | // Error due to NO Decay Table |
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206 | if ( (decaytable == 0) && !isExtDecayer &&!isPreAssigned ){ |
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207 | if (GetVerboseLevel()>0) { |
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208 | G4cout << "G4Decay::DoIt : decay table not defined for "; |
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209 | G4cout << aParticle->GetDefinition()->GetParticleName()<< G4endl; |
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210 | } |
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211 | G4Exception( "G4Decay::DecayIt ", |
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212 | "No Decay Table",JustWarning, |
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213 | "Decay table is not defined"); |
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214 | |
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215 | fParticleChangeForDecay.SetNumberOfSecondaries(0); |
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216 | // Kill the parent particle |
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217 | fParticleChangeForDecay.ProposeTrackStatus( fStopAndKill ) ; |
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218 | fParticleChangeForDecay.ProposeLocalEnergyDeposit(0.0); |
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219 | |
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220 | ClearNumberOfInteractionLengthLeft(); |
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221 | return &fParticleChangeForDecay ; |
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222 | } |
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223 | |
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224 | if (isPreAssigned) { |
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225 | // copy decay products |
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226 | products = new G4DecayProducts(*o_products); |
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227 | } else if ( isExtDecayer ) { |
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228 | // decay according to external decayer |
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229 | products = pExtDecayer->ImportDecayProducts(aTrack); |
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230 | } else { |
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231 | // decay acoording to decay table |
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232 | // choose a decay channel |
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233 | G4VDecayChannel *decaychannel = decaytable->SelectADecayChannel(); |
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234 | if (decaychannel == 0 ){ |
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235 | // decay channel not found |
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236 | G4Exception("G4Decay::DoIt : can not determine decay channel "); |
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237 | } else { |
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238 | // execute DecayIt() |
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239 | #ifdef G4VERBOSE |
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240 | G4int temp = decaychannel->GetVerboseLevel(); |
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241 | if (GetVerboseLevel()>1) { |
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242 | G4cout << "G4Decay::DoIt : selected decay channel addr:" << decaychannel <<G4endl; |
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243 | decaychannel->SetVerboseLevel(GetVerboseLevel()); |
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244 | } |
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245 | #endif |
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246 | products = decaychannel->DecayIt(aParticle->GetMass()); |
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247 | #ifdef G4VERBOSE |
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248 | if (GetVerboseLevel()>1) { |
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249 | decaychannel->SetVerboseLevel(temp); |
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250 | } |
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251 | #endif |
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252 | #ifdef G4VERBOSE |
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253 | if (GetVerboseLevel()>2) { |
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254 | if (! products->IsChecked() ) products->DumpInfo(); |
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255 | } |
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256 | #endif |
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257 | } |
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258 | } |
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259 | |
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260 | // get parent particle information ................................... |
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261 | G4double ParentEnergy = aParticle->GetTotalEnergy(); |
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262 | G4double ParentMass = aParticle->GetMass(); |
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263 | if (ParentEnergy < ParentMass) { |
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264 | ParentEnergy = ParentMass; |
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265 | if (GetVerboseLevel()>0) { |
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266 | G4cout << "G4Decay::DoIt : Total Energy is less than its mass" << G4endl; |
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267 | G4cout << " Particle: " << aParticle->GetDefinition()->GetParticleName(); |
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268 | G4cout << " Energy:" << ParentEnergy/MeV << "[MeV]"; |
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269 | G4cout << " Mass:" << ParentMass/MeV << "[MeV]"; |
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270 | G4cout << G4endl; |
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271 | } |
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272 | } |
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273 | |
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274 | G4ThreeVector ParentDirection(aParticle->GetMomentumDirection()); |
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275 | |
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276 | //boost all decay products to laboratory frame |
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277 | G4double energyDeposit = 0.0; |
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278 | G4double finalGlobalTime = aTrack.GetGlobalTime(); |
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279 | if (aTrack.GetTrackStatus() == fStopButAlive ){ |
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280 | // AtRest case |
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281 | finalGlobalTime += fRemainderLifeTime; |
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282 | energyDeposit += aParticle->GetKineticEnergy(); |
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283 | if (isPreAssigned) products->Boost( ParentEnergy, ParentDirection); |
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284 | } else { |
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285 | // PostStep case |
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286 | if (!isExtDecayer) products->Boost( ParentEnergy, ParentDirection); |
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287 | } |
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288 | |
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289 | // set polarization for daughter particles |
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290 | DaughterPolarization(aTrack, products); |
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291 | |
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292 | |
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293 | //add products in fParticleChangeForDecay |
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294 | G4int numberOfSecondaries = products->entries(); |
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295 | fParticleChangeForDecay.SetNumberOfSecondaries(numberOfSecondaries); |
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296 | #ifdef G4VERBOSE |
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297 | if (GetVerboseLevel()>1) { |
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298 | G4cout << "G4Decay::DoIt : Decay vertex :"; |
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299 | G4cout << " Time: " << finalGlobalTime/ns << "[ns]"; |
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300 | G4cout << " X:" << (aTrack.GetPosition()).x() /cm << "[cm]"; |
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301 | G4cout << " Y:" << (aTrack.GetPosition()).y() /cm << "[cm]"; |
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302 | G4cout << " Z:" << (aTrack.GetPosition()).z() /cm << "[cm]"; |
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303 | G4cout << G4endl; |
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304 | G4cout << "G4Decay::DoIt : decay products in Lab. Frame" << G4endl; |
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305 | products->DumpInfo(); |
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306 | } |
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307 | #endif |
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308 | G4int index; |
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309 | G4ThreeVector currentPosition; |
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310 | const G4TouchableHandle thand = aTrack.GetTouchableHandle(); |
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311 | for (index=0; index < numberOfSecondaries; index++) |
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312 | { |
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313 | // get current position of the track |
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314 | currentPosition = aTrack.GetPosition(); |
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315 | // create a new track object |
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316 | G4Track* secondary = new G4Track( products->PopProducts(), |
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317 | finalGlobalTime , |
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318 | currentPosition ); |
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319 | // switch on good for tracking flag |
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320 | secondary->SetGoodForTrackingFlag(); |
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321 | secondary->SetTouchableHandle(thand); |
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322 | // add the secondary track in the List |
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323 | fParticleChangeForDecay.AddSecondary(secondary); |
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324 | } |
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325 | delete products; |
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326 | |
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327 | // Kill the parent particle |
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328 | fParticleChangeForDecay.ProposeTrackStatus( fStopAndKill ) ; |
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329 | fParticleChangeForDecay.ProposeLocalEnergyDeposit(energyDeposit); |
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330 | fParticleChangeForDecay.ProposeGlobalTime( finalGlobalTime ); |
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331 | // Clear NumberOfInteractionLengthLeft |
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332 | ClearNumberOfInteractionLengthLeft(); |
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333 | |
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334 | return &fParticleChangeForDecay ; |
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335 | } |
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336 | |
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337 | void G4Decay::DaughterPolarization(const G4Track& , G4DecayProducts* ) |
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338 | { |
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339 | } |
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340 | |
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341 | |
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342 | |
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343 | void G4Decay::StartTracking(G4Track*) |
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344 | { |
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345 | currentInteractionLength = -1.0; |
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346 | ResetNumberOfInteractionLengthLeft(); |
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347 | |
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348 | fRemainderLifeTime = -1.0; |
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349 | } |
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350 | |
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351 | void G4Decay::EndTracking() |
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352 | { |
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353 | // Clear NumberOfInteractionLengthLeft |
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354 | ClearNumberOfInteractionLengthLeft(); |
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355 | |
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356 | currentInteractionLength = -1.0; |
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357 | } |
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358 | |
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359 | |
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360 | G4double G4Decay::PostStepGetPhysicalInteractionLength( |
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361 | const G4Track& track, |
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362 | G4double previousStepSize, |
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363 | G4ForceCondition* condition |
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364 | ) |
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365 | { |
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366 | |
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367 | // condition is set to "Not Forced" |
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368 | *condition = NotForced; |
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369 | |
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370 | // pre-assigned Decay time |
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371 | G4double pTime = track.GetDynamicParticle()->GetPreAssignedDecayProperTime(); |
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372 | G4double aLife = track.GetDynamicParticle()->GetDefinition()->GetPDGLifeTime(); |
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373 | |
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374 | if (pTime < 0.) { |
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375 | // normal case |
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376 | if ( previousStepSize > 0.0){ |
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377 | // subtract NumberOfInteractionLengthLeft |
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378 | SubtractNumberOfInteractionLengthLeft(previousStepSize); |
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379 | if(theNumberOfInteractionLengthLeft<0.){ |
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380 | theNumberOfInteractionLengthLeft=perMillion; |
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381 | } |
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382 | fRemainderLifeTime = theNumberOfInteractionLengthLeft*aLife; |
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383 | } |
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384 | // get mean free path |
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385 | currentInteractionLength = GetMeanFreePath(track, previousStepSize, condition); |
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386 | |
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387 | #ifdef G4VERBOSE |
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388 | if ((currentInteractionLength <=0.0) || (verboseLevel>2)){ |
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389 | G4cout << "G4Decay::PostStepGetPhysicalInteractionLength " << G4endl; |
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390 | track.GetDynamicParticle()->DumpInfo(); |
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391 | G4cout << " in Material " << track.GetMaterial()->GetName() <<G4endl; |
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392 | G4cout << "MeanFreePath = " << currentInteractionLength/cm << "[cm]" <<G4endl; |
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393 | } |
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394 | #endif |
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395 | |
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396 | G4double value; |
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397 | if (currentInteractionLength <DBL_MAX) { |
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398 | value = theNumberOfInteractionLengthLeft * currentInteractionLength; |
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399 | } else { |
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400 | value = DBL_MAX; |
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401 | } |
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402 | |
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403 | return value; |
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404 | |
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405 | } else { |
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406 | //pre-assigned Decay time case |
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407 | // reminder proper time |
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408 | fRemainderLifeTime = pTime - track.GetProperTime(); |
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409 | if (fRemainderLifeTime <= 0.0) fRemainderLifeTime = DBL_MIN; |
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410 | |
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411 | G4double rvalue=0.0; |
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412 | // use pre-assigned Decay time to determine PIL |
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413 | if (aLife>0.0) { |
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414 | // ordinary particle |
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415 | rvalue = (fRemainderLifeTime/aLife)*GetMeanFreePath(track, previousStepSize, condition); |
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416 | } else { |
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417 | // shortlived particle |
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418 | rvalue = c_light * fRemainderLifeTime; |
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419 | // by using normalized kinetic energy (= Ekin/mass) |
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420 | G4double aMass = track.GetDynamicParticle()->GetMass(); |
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421 | rvalue *= track.GetDynamicParticle()->GetTotalMomentum()/aMass; |
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422 | } |
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423 | return rvalue; |
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424 | } |
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425 | } |
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426 | |
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427 | G4double G4Decay::AtRestGetPhysicalInteractionLength( |
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428 | const G4Track& track, |
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429 | G4ForceCondition* condition |
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430 | ) |
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431 | { |
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432 | // condition is set to "Not Forced" |
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433 | *condition = NotForced; |
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434 | |
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435 | G4double pTime = track.GetDynamicParticle()->GetPreAssignedDecayProperTime(); |
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436 | if (pTime >= 0.) { |
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437 | fRemainderLifeTime = pTime - track.GetProperTime(); |
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438 | if (fRemainderLifeTime <= 0.0) fRemainderLifeTime = DBL_MIN; |
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439 | } else { |
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440 | fRemainderLifeTime = |
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441 | theNumberOfInteractionLengthLeft * GetMeanLifeTime(track, condition); |
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442 | } |
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443 | return fRemainderLifeTime; |
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444 | } |
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445 | |
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446 | |
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447 | void G4Decay::SetExtDecayer(G4VExtDecayer* val) |
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448 | { |
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449 | pExtDecayer = val; |
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450 | |
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451 | // set Process Sub Type |
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452 | if ( pExtDecayer !=0 ) { |
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453 | SetProcessSubType(static_cast<int>(DECAY_External)); |
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454 | } |
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455 | } |
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