[819] | 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 | #include "G4LowEIonFragmentation.hh" |
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| 27 | #include <algorithm> |
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| 28 | |
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| 29 | G4int G4LowEIonFragmentation::hits = 0; |
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| 30 | G4int G4LowEIonFragmentation::totalTries = 0; |
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| 31 | G4double G4LowEIonFragmentation::area = 0; |
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| 32 | |
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| 33 | G4HadFinalState * G4LowEIonFragmentation:: |
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| 34 | ApplyYourself(const G4HadProjectile & thePrimary, G4Nucleus & theNucleus) |
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| 35 | { |
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| 36 | area = 0; |
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| 37 | // initialize the particle change |
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| 38 | theResult.Clear(); |
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| 39 | theResult.SetStatusChange( stopAndKill ); |
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| 40 | theResult.SetEnergyChange( 0.0 ); |
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| 41 | |
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| 42 | // Get Target A, Z |
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| 43 | G4double aTargetA = theNucleus.GetN(); |
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| 44 | G4double aTargetZ = theNucleus.GetZ(); |
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| 45 | |
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| 46 | // Get Projectile A, Z |
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| 47 | G4double aProjectileA = thePrimary.GetDefinition()->GetBaryonNumber(); |
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| 48 | G4double aProjectileZ = thePrimary.GetDefinition()->GetPDGCharge(); |
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| 49 | |
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| 50 | // Get Maximum radius of both |
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| 51 | |
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| 52 | G4Fancy3DNucleus aPrim; |
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| 53 | aPrim.Init(aProjectileA, aProjectileZ); |
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| 54 | G4double projectileOuterRadius = aPrim.GetOuterRadius(); |
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| 55 | |
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| 56 | G4Fancy3DNucleus aTarg; |
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| 57 | aTarg.Init(aTargetA, aTargetZ); |
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| 58 | G4double targetOuterRadius = aTarg.GetOuterRadius(); |
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| 59 | |
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| 60 | // Get the Impact parameter |
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| 61 | G4int particlesFromProjectile = 0; |
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| 62 | G4int chargedFromProjectile = 0; |
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| 63 | G4double impactParameter = 0; |
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| 64 | G4double x,y; |
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| 65 | G4Nucleon * pNucleon; |
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| 66 | // need at lease one particle from the projectile model beyond the |
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| 67 | // projectileHorizon. |
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| 68 | while(0==particlesFromProjectile) |
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| 69 | { |
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| 70 | do |
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| 71 | { |
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| 72 | x = 2*G4UniformRand() - 1; |
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| 73 | y = 2*G4UniformRand() - 1; |
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| 74 | } |
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| 75 | while(x*x + y*y > 1); |
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| 76 | impactParameter = std::sqrt(x*x+y*y)*(targetOuterRadius+projectileOuterRadius); |
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| 77 | totalTries++; |
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| 78 | area = pi*(targetOuterRadius+projectileOuterRadius)* |
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| 79 | (targetOuterRadius+projectileOuterRadius); |
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| 80 | G4double projectileHorizon = impactParameter-targetOuterRadius; |
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| 81 | |
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| 82 | // Empirical boundary transparency. |
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| 83 | G4double empirical = G4UniformRand(); |
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| 84 | if(projectileHorizon/projectileOuterRadius>empirical) continue; |
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| 85 | |
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| 86 | // Calculate the number of nucleons involved in collision |
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| 87 | // From projectile |
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| 88 | aPrim.StartLoop(); |
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| 89 | while((pNucleon = aPrim.GetNextNucleon())) |
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| 90 | { |
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| 91 | if(pNucleon->GetPosition().y()>projectileHorizon) |
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| 92 | { |
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| 93 | // We have one |
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| 94 | particlesFromProjectile++; |
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| 95 | if(pNucleon->GetParticleType()==G4Proton::ProtonDefinition()) |
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| 96 | { |
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| 97 | chargedFromProjectile++; |
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| 98 | } |
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| 99 | } |
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| 100 | } |
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| 101 | } |
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| 102 | hits ++; |
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| 103 | |
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| 104 | // From target: |
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| 105 | G4double targetHorizon = impactParameter-projectileOuterRadius; |
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| 106 | G4int chargedFromTarget = 0; |
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| 107 | G4int particlesFromTarget = 0; |
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| 108 | aTarg.StartLoop(); |
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| 109 | while((pNucleon = aTarg.GetNextNucleon())) |
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| 110 | { |
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| 111 | if(pNucleon->GetPosition().y()>targetHorizon) |
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| 112 | { |
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| 113 | // We have one |
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| 114 | particlesFromTarget++; |
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| 115 | if(pNucleon->GetParticleType()==G4Proton::ProtonDefinition()) |
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| 116 | { |
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| 117 | chargedFromTarget++; |
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| 118 | } |
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| 119 | } |
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| 120 | } |
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| 121 | |
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| 122 | // Energy sharing between projectile and target. Note that this is a quite simplistic kinetically. |
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| 123 | G4ThreeVector exciton3Momentum = thePrimary.Get4Momentum().vect(); |
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| 124 | exciton3Momentum *= particlesFromProjectile/aProjectileA; |
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| 125 | |
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| 126 | G4double compoundEnergy = thePrimary.GetTotalEnergy()*particlesFromProjectile/aProjectileA; |
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| 127 | G4double targetMass = G4ParticleTable::GetParticleTable() |
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| 128 | ->GetIonTable()->GetIonMass(static_cast<G4int>(aTargetZ) ,static_cast<G4int>(aTargetA)); |
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| 129 | compoundEnergy += targetMass; |
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| 130 | G4LorentzVector fragment4Momentum(exciton3Momentum, compoundEnergy); |
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| 131 | |
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| 132 | // take the nucleons and fill the Fragments |
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| 133 | G4Fragment anInitialState; |
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| 134 | anInitialState.SetA(aTargetA+particlesFromProjectile); |
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| 135 | anInitialState.SetZ(aTargetZ+chargedFromProjectile); |
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| 136 | anInitialState.SetNumberOfParticles(particlesFromProjectile); |
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| 137 | anInitialState.SetNumberOfHoles(particlesFromTarget); |
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| 138 | anInitialState.SetNumberOfCharged(chargedFromProjectile + chargedFromTarget); |
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| 139 | anInitialState.SetMomentum(fragment4Momentum); |
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| 140 | |
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| 141 | // Fragment the Fragment using Pre-compound |
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| 142 | G4ReactionProductVector* thePreCompoundResult; |
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| 143 | thePreCompoundResult = theModel->DeExcite(anInitialState); |
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| 144 | |
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| 145 | // De-excite the projectile using ExcitationHandler |
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| 146 | |
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| 147 | G4ReactionProductVector * theExcitationResult = 0; |
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| 148 | if(particlesFromProjectile != aProjectileA) |
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| 149 | { |
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| 150 | G4ThreeVector residual3Momentum = thePrimary.Get4Momentum().vect(); |
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| 151 | residual3Momentum -= exciton3Momentum; |
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| 152 | G4double residualEnergy = thePrimary.GetTotalEnergy()*(1.-particlesFromProjectile/aProjectileA); |
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| 153 | G4LorentzVector residual4Momentum(residual3Momentum, residualEnergy); |
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| 154 | |
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| 155 | G4Fragment initialState2; |
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| 156 | initialState2.SetA(aProjectileA-particlesFromProjectile); |
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| 157 | initialState2.SetZ(aProjectileZ-chargedFromProjectile); |
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| 158 | initialState2.SetNumberOfHoles(static_cast<G4int>((aProjectileA-particlesFromProjectile)/2.0)); |
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| 159 | initialState2.SetNumberOfParticles(static_cast<G4int>((aProjectileZ-chargedFromProjectile)/2.0)); |
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| 160 | initialState2.SetNumberOfCharged(static_cast<G4int>((aProjectileZ-chargedFromProjectile)/2.0)); |
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| 161 | |
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| 162 | |
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| 163 | initialState2.SetMomentum(residual4Momentum); |
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| 164 | theExcitationResult = theHandler->BreakItUp(initialState2); |
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| 165 | } |
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| 166 | |
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| 167 | // Fill the particle change |
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| 168 | G4int nSecondaries = 0; |
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| 169 | if(theExcitationResult) nSecondaries+=theExcitationResult->size(); |
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| 170 | if(thePreCompoundResult) nSecondaries+=thePreCompoundResult->size(); |
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| 171 | |
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| 172 | unsigned int k; |
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| 173 | if(theExcitationResult!=0) |
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| 174 | { |
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| 175 | for(k=0; k<theExcitationResult->size(); k++) |
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| 176 | { |
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| 177 | G4DynamicParticle* p0 = new G4DynamicParticle; |
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| 178 | p0->SetDefinition( theExcitationResult->operator[](k)->GetDefinition() ); |
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| 179 | p0->SetMomentum( theExcitationResult->operator[](k)->GetMomentum() ); |
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| 180 | theResult.AddSecondary(p0); |
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| 181 | } |
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| 182 | } |
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| 183 | |
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| 184 | for(k=0; k<thePreCompoundResult->size(); k++) |
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| 185 | { |
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| 186 | G4DynamicParticle* p0 = new G4DynamicParticle; |
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| 187 | p0->SetDefinition(thePreCompoundResult->operator[](k)->GetDefinition()); |
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| 188 | p0->SetMomentum(thePreCompoundResult->operator[](k)->GetMomentum()); |
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| 189 | theResult.AddSecondary(p0); |
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| 190 | } |
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| 191 | |
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| 192 | // clean up |
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| 193 | std::for_each(thePreCompoundResult->begin(), thePreCompoundResult->end(), DeleteReactionProduct()); |
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| 194 | if(theExcitationResult) |
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| 195 | { |
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| 196 | std::for_each(theExcitationResult->begin(), theExcitationResult->end(), DeleteReactionProduct()); |
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| 197 | } |
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| 198 | delete thePreCompoundResult; |
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| 199 | if(theExcitationResult) delete theExcitationResult; |
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| 200 | |
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| 201 | // return the particle change |
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| 202 | return &theResult; |
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| 203 | |
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| 204 | } |
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