[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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[962] | 26 | // $Id: G4RPGProtonInelastic.cc,v 1.4 2008/05/05 21:21:55 dennis Exp $ |
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[1007] | 27 | // GEANT4 tag $Name: geant4-09-02 $ |
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[819] | 28 | // |
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| 29 | |
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| 30 | #include "G4RPGProtonInelastic.hh" |
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| 31 | #include "Randomize.hh" |
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| 32 | |
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| 33 | G4HadFinalState* |
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[962] | 34 | G4RPGProtonInelastic::ApplyYourself(const G4HadProjectile& aTrack, |
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| 35 | G4Nucleus& targetNucleus ) |
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[819] | 36 | { |
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| 37 | theParticleChange.Clear(); |
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| 38 | const G4HadProjectile *originalIncident = &aTrack; |
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[962] | 39 | if (originalIncident->GetKineticEnergy()<= 0.1) |
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[819] | 40 | { |
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| 41 | theParticleChange.SetStatusChange(isAlive); |
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| 42 | theParticleChange.SetEnergyChange(aTrack.GetKineticEnergy()); |
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| 43 | theParticleChange.SetMomentumChange(aTrack.Get4Momentum().vect().unit()); |
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| 44 | return &theParticleChange; |
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| 45 | } |
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| 46 | |
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| 47 | // |
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| 48 | // create the target particle |
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| 49 | // |
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| 50 | G4DynamicParticle *originalTarget = targetNucleus.ReturnTargetParticle(); |
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| 51 | |
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[962] | 52 | if (originalIncident->GetKineticEnergy()/GeV < 0.01+2.*G4UniformRand()/9. ) |
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[819] | 53 | { |
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| 54 | SlowProton( originalIncident, targetNucleus ); |
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| 55 | delete originalTarget; |
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| 56 | return &theParticleChange; |
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| 57 | } |
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| 58 | |
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| 59 | // Fermi motion and evaporation |
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| 60 | // As of Geant3, the Fermi energy calculation had not been Done |
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[962] | 61 | |
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| 62 | G4double ek = originalIncident->GetKineticEnergy(); |
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| 63 | G4double amas = originalIncident->GetDefinition()->GetPDGMass(); |
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[819] | 64 | G4ReactionProduct modifiedOriginal; |
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| 65 | modifiedOriginal = *originalIncident; |
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| 66 | |
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| 67 | G4double tkin = targetNucleus.Cinema( ek ); |
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| 68 | ek += tkin; |
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[962] | 69 | modifiedOriginal.SetKineticEnergy(ek); |
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[819] | 70 | G4double et = ek + amas; |
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| 71 | G4double p = std::sqrt( std::abs((et-amas)*(et+amas)) ); |
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[962] | 72 | G4double pp = modifiedOriginal.GetMomentum().mag(); |
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| 73 | if (pp > 0.0) { |
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[819] | 74 | G4ThreeVector momentum = modifiedOriginal.GetMomentum(); |
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| 75 | modifiedOriginal.SetMomentum( momentum * (p/pp) ); |
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| 76 | } |
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| 77 | // |
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| 78 | // calculate black track energies |
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| 79 | // |
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[962] | 80 | tkin = targetNucleus.EvaporationEffects(ek); |
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[819] | 81 | ek -= tkin; |
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[962] | 82 | modifiedOriginal.SetKineticEnergy(ek); |
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[819] | 83 | et = ek + amas; |
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| 84 | p = std::sqrt( std::abs((et-amas)*(et+amas)) ); |
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[962] | 85 | pp = modifiedOriginal.GetMomentum().mag(); |
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| 86 | if (pp > 0.0) { |
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[819] | 87 | G4ThreeVector momentum = modifiedOriginal.GetMomentum(); |
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| 88 | modifiedOriginal.SetMomentum( momentum * (p/pp) ); |
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| 89 | } |
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| 90 | const G4double cutOff = 0.1; |
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[962] | 91 | if (modifiedOriginal.GetKineticEnergy() < cutOff) { |
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[819] | 92 | SlowProton( originalIncident, targetNucleus ); |
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| 93 | delete originalTarget; |
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| 94 | return &theParticleChange; |
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| 95 | } |
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| 96 | |
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| 97 | G4ReactionProduct currentParticle = modifiedOriginal; |
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| 98 | G4ReactionProduct targetParticle; |
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| 99 | targetParticle = *originalTarget; |
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| 100 | currentParticle.SetSide( 1 ); // incident always goes in forward hemisphere |
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| 101 | targetParticle.SetSide( -1 ); // target always goes in backward hemisphere |
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| 102 | G4bool incidentHasChanged = false; |
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| 103 | G4bool targetHasChanged = false; |
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| 104 | G4bool quasiElastic = false; |
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| 105 | G4FastVector<G4ReactionProduct,256> vec; // vec will contain the sec. particles |
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| 106 | G4int vecLen = 0; |
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| 107 | vec.Initialize( 0 ); |
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| 108 | |
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[962] | 109 | InitialCollision(vec, vecLen, currentParticle, targetParticle, |
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| 110 | incidentHasChanged, targetHasChanged); |
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[819] | 111 | |
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[962] | 112 | CalculateMomenta(vec, vecLen, |
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| 113 | originalIncident, originalTarget, modifiedOriginal, |
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| 114 | targetNucleus, currentParticle, targetParticle, |
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| 115 | incidentHasChanged, targetHasChanged, quasiElastic); |
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[819] | 116 | |
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| 117 | SetUpChange( vec, vecLen, |
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| 118 | currentParticle, targetParticle, |
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| 119 | incidentHasChanged ); |
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| 120 | |
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| 121 | delete originalTarget; |
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| 122 | return &theParticleChange; |
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| 123 | } |
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| 124 | |
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[962] | 125 | |
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[819] | 126 | void |
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| 127 | G4RPGProtonInelastic::SlowProton(const G4HadProjectile *originalIncident, |
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| 128 | G4Nucleus &targetNucleus ) |
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| 129 | { |
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| 130 | const G4double A = targetNucleus.GetN(); // atomic weight |
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| 131 | const G4double Z = targetNucleus.GetZ(); // atomic number |
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[962] | 132 | // G4double currentKinetic = originalIncident->GetKineticEnergy(); |
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[819] | 133 | // |
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| 134 | // calculate Q-value of reactions |
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| 135 | // |
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| 136 | G4double theAtomicMass = targetNucleus.AtomicMass( A, Z ); |
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| 137 | G4double massVec[9]; |
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| 138 | massVec[0] = targetNucleus.AtomicMass( A+1.0, Z+1.0 ); |
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| 139 | massVec[1] = 0.; |
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| 140 | if (A > Z+1.0) |
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| 141 | massVec[1] = targetNucleus.AtomicMass( A , Z+1.0 ); |
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| 142 | massVec[2] = theAtomicMass; |
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| 143 | massVec[3] = 0.; |
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| 144 | if (A > 1.0 && A-1.0 > Z) |
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| 145 | massVec[3] = targetNucleus.AtomicMass( A-1.0, Z ); |
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| 146 | massVec[4] = 0.; |
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| 147 | if (A > 2.0 && A-2.0 > Z) |
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| 148 | massVec[4] = targetNucleus.AtomicMass( A-2.0, Z ); |
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| 149 | massVec[5] = 0.; |
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| 150 | if (A > 3.0 && Z > 1.0 && A-3.0 > Z-1.0) |
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| 151 | massVec[5] = targetNucleus.AtomicMass( A-3.0, Z-1.0 ); |
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| 152 | massVec[6] = 0.; |
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| 153 | if (A > 1.0 && A-1.0 > Z+1.0) |
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| 154 | massVec[6] = targetNucleus.AtomicMass( A-1.0, Z+1.0 ); |
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| 155 | massVec[7] = massVec[3]; |
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| 156 | massVec[8] = 0.; |
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| 157 | if (A > 1.0 && Z > 1.0) |
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| 158 | massVec[8] = targetNucleus.AtomicMass( A-1.0, Z-1.0 ); |
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| 159 | |
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| 160 | G4FastVector<G4ReactionProduct,4> vec; // vec will contain the secondary particles |
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| 161 | G4int vecLen = 0; |
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| 162 | vec.Initialize( 0 ); |
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| 163 | |
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| 164 | twoBody.NuclearReaction( vec, vecLen, originalIncident, |
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| 165 | targetNucleus, theAtomicMass, massVec ); |
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| 166 | |
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| 167 | theParticleChange.SetStatusChange( stopAndKill ); |
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| 168 | theParticleChange.SetEnergyChange( 0.0 ); |
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| 169 | |
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| 170 | G4DynamicParticle *pd; |
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| 171 | for( G4int i=0; i<vecLen; ++i ) |
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| 172 | { |
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| 173 | pd = new G4DynamicParticle(); |
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| 174 | pd->SetDefinition( vec[i]->GetDefinition() ); |
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| 175 | pd->SetMomentum( vec[i]->GetMomentum() ); |
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| 176 | theParticleChange.AddSecondary( pd ); |
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| 177 | delete vec[i]; |
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| 178 | } |
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| 179 | } |
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[962] | 180 | |
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| 181 | |
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| 182 | // Initial Collision |
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| 183 | // selects the particle types arising from the initial collision of |
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| 184 | // the proton and target nucleon. Secondaries are assigned to forward |
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| 185 | // and backward reaction hemispheres, but final state energies and |
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| 186 | // momenta are not calculated here. |
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| 187 | |
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| 188 | void |
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| 189 | G4RPGProtonInelastic::InitialCollision(G4FastVector<G4ReactionProduct,256>& vec, |
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| 190 | G4int& vecLen, |
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| 191 | G4ReactionProduct& currentParticle, |
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| 192 | G4ReactionProduct& targetParticle, |
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| 193 | G4bool& incidentHasChanged, |
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| 194 | G4bool& targetHasChanged) |
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| 195 | { |
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| 196 | G4double KE = currentParticle.GetKineticEnergy()/GeV; |
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| 197 | |
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| 198 | G4int mult; |
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| 199 | G4int partType; |
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| 200 | std::vector<G4int> fsTypes; |
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| 201 | G4int part1; |
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| 202 | G4int part2; |
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| 203 | |
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| 204 | G4double testCharge; |
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| 205 | G4double testBaryon; |
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| 206 | G4double testStrange; |
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[819] | 207 | |
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[962] | 208 | // Get particle types according to incident and target types |
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| 209 | |
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| 210 | if (targetParticle.GetDefinition() == particleDef[pro]) { |
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| 211 | mult = GetMultiplicityT1(KE); |
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| 212 | fsTypes = GetFSPartTypesForPP(mult, KE); |
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| 213 | |
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| 214 | part1 = fsTypes[0]; |
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| 215 | part2 = fsTypes[1]; |
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| 216 | currentParticle.SetDefinition(particleDef[part1]); |
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| 217 | targetParticle.SetDefinition(particleDef[part2]); |
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| 218 | if (part1 == pro) { |
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| 219 | if (part2 == neu) { |
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| 220 | if (G4UniformRand() > 0.5) { |
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| 221 | incidentHasChanged = true; |
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| 222 | targetParticle.SetDefinition(particleDef[part1]); |
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| 223 | currentParticle.SetDefinition(particleDef[part2]); |
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| 224 | } else { |
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| 225 | targetHasChanged = true; |
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| 226 | } |
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| 227 | } else if (part2 > neu && part2 < xi0) { |
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| 228 | targetHasChanged = true; |
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[819] | 229 | } |
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[962] | 230 | |
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| 231 | } else { // neutron |
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| 232 | targetHasChanged = true; |
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| 233 | incidentHasChanged = true; |
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[819] | 234 | } |
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[962] | 235 | |
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| 236 | testCharge = 2.0; |
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| 237 | testBaryon = 2.0; |
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| 238 | testStrange = 0.0; |
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| 239 | |
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| 240 | } else { // target was a neutron |
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| 241 | mult = GetMultiplicityT0(KE); |
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| 242 | fsTypes = GetFSPartTypesForPN(mult, KE); |
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| 243 | |
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| 244 | part1 = fsTypes[0]; |
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| 245 | part2 = fsTypes[1]; |
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| 246 | currentParticle.SetDefinition(particleDef[part1]); |
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| 247 | targetParticle.SetDefinition(particleDef[part2]); |
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| 248 | if (part1 == pro) { |
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| 249 | if (part2 == pro) { |
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| 250 | targetHasChanged = true; |
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| 251 | } else if (part2 == neu) { |
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| 252 | if (G4UniformRand() > 0.5) { |
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| 253 | incidentHasChanged = true; |
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| 254 | targetHasChanged = true; |
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| 255 | targetParticle.SetDefinition(particleDef[part1]); |
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| 256 | currentParticle.SetDefinition(particleDef[part2]); |
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| 257 | } |
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| 258 | } else { // hyperon |
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| 259 | targetHasChanged = true; |
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[819] | 260 | } |
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[962] | 261 | |
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| 262 | } else { // neutron |
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| 263 | incidentHasChanged = true; |
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| 264 | if (part2 > neu && part2 < xi0) targetHasChanged = true; |
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[819] | 265 | } |
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[962] | 266 | |
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| 267 | testCharge = 1.0; |
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| 268 | testBaryon = 2.0; |
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| 269 | testStrange = 0.0; |
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[819] | 270 | } |
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| 271 | |
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[962] | 272 | // Remove incident and target from fsTypes |
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[819] | 273 | |
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[962] | 274 | fsTypes.erase(fsTypes.begin()); |
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| 275 | fsTypes.erase(fsTypes.begin()); |
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| 276 | |
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| 277 | // Remaining particles are secondaries. Put them into vec. |
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| 278 | |
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| 279 | G4ReactionProduct* rp(0); |
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| 280 | for(G4int i=0; i < mult-2; ++i ) { |
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| 281 | partType = fsTypes[i]; |
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| 282 | rp = new G4ReactionProduct(); |
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| 283 | rp->SetDefinition(particleDef[partType]); |
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| 284 | (G4UniformRand() < 0.5) ? rp->SetSide(-1) : rp->SetSide(1); |
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| 285 | vec.SetElement(vecLen++, rp); |
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| 286 | } |
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| 287 | |
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| 288 | // Check conservation of charge, strangeness, baryon number |
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| 289 | |
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| 290 | CheckQnums(vec, vecLen, currentParticle, targetParticle, |
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| 291 | testCharge, testBaryon, testStrange); |
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| 292 | |
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| 293 | return; |
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| 294 | } |
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