[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: G4RPGTwoCluster.cc,v 1.5 2008/06/09 18:13:35 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 "G4RPGTwoCluster.hh" |
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| 31 | #include "Randomize.hh" |
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| 32 | #include "G4Poisson.hh" |
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| 33 | #include <iostream> |
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| 34 | #include "G4HadReentrentException.hh" |
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| 35 | #include <signal.h> |
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| 36 | |
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| 37 | |
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| 38 | G4RPGTwoCluster::G4RPGTwoCluster() |
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| 39 | : G4RPGReaction() {} |
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| 40 | |
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| 41 | |
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| 42 | G4bool G4RPGTwoCluster:: |
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| 43 | ReactionStage(const G4HadProjectile* originalIncident, |
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| 44 | G4ReactionProduct& modifiedOriginal, |
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| 45 | G4bool& incidentHasChanged, |
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| 46 | const G4DynamicParticle* originalTarget, |
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| 47 | G4ReactionProduct& targetParticle, |
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| 48 | G4bool& targetHasChanged, |
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| 49 | const G4Nucleus& targetNucleus, |
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| 50 | G4ReactionProduct& currentParticle, |
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| 51 | G4FastVector<G4ReactionProduct,256>& vec, |
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| 52 | G4int& vecLen, |
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| 53 | G4bool leadFlag, |
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| 54 | G4ReactionProduct& leadingStrangeParticle) |
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| 55 | { |
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| 56 | // Derived from H. Fesefeldt's FORTRAN code TWOCLU |
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| 57 | // |
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| 58 | // A simple two cluster model is used to generate x- and pt- values for |
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| 59 | // incident, target, and all secondary particles. |
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| 60 | // This should be sufficient for low energy interactions. |
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| 61 | // |
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| 62 | |
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| 63 | G4int i; |
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| 64 | G4ParticleDefinition *aProton = G4Proton::Proton(); |
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| 65 | G4ParticleDefinition *aNeutron = G4Neutron::Neutron(); |
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| 66 | G4ParticleDefinition *aPiPlus = G4PionPlus::PionPlus(); |
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| 67 | G4ParticleDefinition *aPiMinus = G4PionMinus::PionMinus(); |
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| 68 | G4ParticleDefinition *aPiZero = G4PionZero::PionZero(); |
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| 69 | G4bool veryForward = false; |
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| 70 | |
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| 71 | const G4double protonMass = aProton->GetPDGMass()/MeV; |
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| 72 | const G4double ekOriginal = modifiedOriginal.GetKineticEnergy()/GeV; |
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| 73 | const G4double etOriginal = modifiedOriginal.GetTotalEnergy()/GeV; |
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| 74 | const G4double mOriginal = modifiedOriginal.GetMass()/GeV; |
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| 75 | const G4double pOriginal = modifiedOriginal.GetMomentum().mag()/GeV; |
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| 76 | G4double targetMass = targetParticle.GetDefinition()->GetPDGMass()/GeV; |
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| 77 | G4double centerofmassEnergy = std::sqrt( mOriginal*mOriginal + |
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| 78 | targetMass*targetMass + |
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| 79 | 2.0*targetMass*etOriginal ); // GeV |
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| 80 | G4double currentMass = currentParticle.GetMass()/GeV; |
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| 81 | targetMass = targetParticle.GetMass()/GeV; |
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| 82 | |
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| 83 | if( currentMass == 0.0 && targetMass == 0.0 ) |
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| 84 | { |
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| 85 | G4double ek = currentParticle.GetKineticEnergy(); |
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| 86 | G4ThreeVector m = currentParticle.GetMomentum(); |
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| 87 | currentParticle = *vec[0]; |
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| 88 | targetParticle = *vec[1]; |
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| 89 | for( i=0; i<(vecLen-2); ++i )*vec[i] = *vec[i+2]; |
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| 90 | if(vecLen<2) |
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| 91 | { |
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| 92 | for(G4int i=0; i<vecLen; i++) delete vec[i]; |
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| 93 | vecLen = 0; |
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| 94 | throw G4HadReentrentException(__FILE__, __LINE__, |
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| 95 | "G4RPGTwoCluster::ReactionStage : Negative number of particles"); |
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| 96 | } |
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| 97 | delete vec[vecLen-1]; |
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| 98 | delete vec[vecLen-2]; |
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| 99 | vecLen -= 2; |
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| 100 | currentMass = currentParticle.GetMass()/GeV; |
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| 101 | targetMass = targetParticle.GetMass()/GeV; |
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| 102 | incidentHasChanged = true; |
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| 103 | targetHasChanged = true; |
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| 104 | currentParticle.SetKineticEnergy( ek ); |
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| 105 | currentParticle.SetMomentum( m ); |
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| 106 | veryForward = true; |
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| 107 | } |
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| 108 | |
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| 109 | const G4double atomicWeight = targetNucleus.GetN(); |
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| 110 | const G4double atomicNumber = targetNucleus.GetZ(); |
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| 111 | // |
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| 112 | // particles have been distributed in forward and backward hemispheres |
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| 113 | // in center of mass system of the hadron nucleon interaction |
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| 114 | // |
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| 115 | |
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| 116 | // Incident particle always in forward hemisphere |
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| 117 | |
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| 118 | G4int forwardCount = 1; // number of particles in forward hemisphere |
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| 119 | currentParticle.SetSide( 1 ); |
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| 120 | G4double forwardMass = currentParticle.GetMass()/GeV; |
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| 121 | G4double cMass = forwardMass; |
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| 122 | |
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| 123 | // Target particle always in backward hemisphere |
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| 124 | |
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| 125 | G4int backwardCount = 1; // number of particles in backward hemisphere |
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| 126 | targetParticle.SetSide( -1 ); |
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| 127 | G4double backwardMass = targetParticle.GetMass()/GeV; |
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| 128 | G4double bMass = backwardMass; |
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| 129 | |
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[962] | 130 | // G4int backwardNucleonCount = 1; // number of nucleons in backward hemisphere |
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[819] | 131 | |
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| 132 | for( i=0; i<vecLen; ++i ) |
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| 133 | { |
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| 134 | if( vec[i]->GetSide() < 0 )vec[i]->SetSide( -1 ); // to take care of |
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| 135 | // case where vec has been preprocessed by GenerateXandPt |
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| 136 | // and some of them have been set to -2 or -3 |
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| 137 | if( vec[i]->GetSide() == -1 ) |
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| 138 | { |
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| 139 | ++backwardCount; |
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| 140 | backwardMass += vec[i]->GetMass()/GeV; |
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| 141 | } |
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| 142 | else |
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| 143 | { |
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| 144 | ++forwardCount; |
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| 145 | forwardMass += vec[i]->GetMass()/GeV; |
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| 146 | } |
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| 147 | } |
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| 148 | |
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| 149 | // |
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| 150 | // Add nucleons and some pions from intra-nuclear cascade |
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| 151 | // |
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| 152 | |
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| 153 | G4double term1 = std::log(centerofmassEnergy*centerofmassEnergy); |
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| 154 | if(term1 < 0) term1 = 0.0001; // making sure xtarg<0; |
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| 155 | const G4double afc = 0.312 + 0.2 * std::log(term1); |
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| 156 | G4double xtarg; |
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| 157 | if( centerofmassEnergy < 2.0+G4UniformRand() ) // added +2 below, JLC 4Jul97 |
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| 158 | xtarg = afc * (std::pow(atomicWeight,0.33)-1.0) * (2*backwardCount+vecLen+2)/2.0; |
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| 159 | else |
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| 160 | xtarg = afc * (std::pow(atomicWeight,0.33)-1.0) * (2*backwardCount); |
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| 161 | if( xtarg <= 0.0 )xtarg = 0.01; |
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| 162 | G4int nuclearExcitationCount = G4Poisson( xtarg ); |
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| 163 | |
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| 164 | if(atomicWeight<1.0001) nuclearExcitationCount = 0; |
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[962] | 165 | // G4int extraNucleonCount = 0; |
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| 166 | // G4double extraMass = 0.0; |
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| 167 | // G4double extraNucleonMass = 0.0; |
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[819] | 168 | if( nuclearExcitationCount > 0 ) |
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| 169 | { |
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| 170 | G4int momentumBin = std::min( 4, G4int(pOriginal/3.0) ); |
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| 171 | const G4double nucsup[] = { 1.0, 0.8, 0.6, 0.5, 0.4 }; |
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| 172 | // |
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| 173 | // NOTE: in TWOCLU, these new particles were given negative codes |
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| 174 | // here we use NewlyAdded = true instead |
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| 175 | // |
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| 176 | for( i=0; i<nuclearExcitationCount; ++i ) |
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| 177 | { |
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| 178 | G4ReactionProduct* pVec = new G4ReactionProduct(); |
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| 179 | if( G4UniformRand() < nucsup[momentumBin] ) // add proton or neutron |
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| 180 | { |
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| 181 | if( G4UniformRand() > 1.0-atomicNumber/atomicWeight ) |
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| 182 | pVec->SetDefinition( aProton ); |
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| 183 | else |
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| 184 | pVec->SetDefinition( aNeutron ); |
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[962] | 185 | // Not used ++backwardNucleonCount; |
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| 186 | // Not used ++extraNucleonCount; |
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| 187 | // Not used extraNucleonMass += pVec->GetMass()/GeV; |
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[819] | 188 | } |
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| 189 | else |
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| 190 | { // add a pion |
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| 191 | G4double ran = G4UniformRand(); |
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| 192 | if( ran < 0.3181 ) |
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| 193 | pVec->SetDefinition( aPiPlus ); |
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| 194 | else if( ran < 0.6819 ) |
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| 195 | pVec->SetDefinition( aPiZero ); |
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| 196 | else |
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| 197 | pVec->SetDefinition( aPiMinus ); |
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[962] | 198 | |
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| 199 | // DHW: add following two lines to correct energy balance |
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| 200 | // ++backwardCount; |
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| 201 | // backwardMass += pVec->GetMass()/GeV; |
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[819] | 202 | } |
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| 203 | pVec->SetSide( -2 ); // backside particle |
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[962] | 204 | // Not used extraMass += pVec->GetMass()/GeV; |
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[819] | 205 | pVec->SetNewlyAdded( true ); |
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| 206 | vec.SetElement( vecLen++, pVec ); |
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| 207 | } |
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| 208 | } |
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| 209 | |
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[962] | 210 | // Masses of particles added from cascade not included in energy balance. |
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| 211 | // That's correct for nucleons from the intra-nuclear cascade but not for |
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| 212 | // pions from the cascade. |
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| 213 | |
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[819] | 214 | G4double forwardEnergy = (centerofmassEnergy-cMass-bMass)/2.0 +cMass - forwardMass; |
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| 215 | G4double backwardEnergy = (centerofmassEnergy-cMass-bMass)/2.0 +bMass - backwardMass; |
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| 216 | G4double eAvailable = centerofmassEnergy - (forwardMass+backwardMass); |
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| 217 | G4bool secondaryDeleted; |
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| 218 | G4double pMass; |
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| 219 | |
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| 220 | while( eAvailable <= 0.0 ) // must eliminate a particle |
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| 221 | { |
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| 222 | secondaryDeleted = false; |
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| 223 | for( i=(vecLen-1); i>=0; --i ) |
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| 224 | { |
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| 225 | if( vec[i]->GetSide() == 1 && vec[i]->GetMayBeKilled()) |
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| 226 | { |
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| 227 | pMass = vec[i]->GetMass()/GeV; |
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| 228 | for( G4int j=i; j<(vecLen-1); ++j )*vec[j] = *vec[j+1]; // shift up |
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| 229 | --forwardCount; |
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| 230 | forwardEnergy += pMass; |
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| 231 | forwardMass -= pMass; |
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| 232 | secondaryDeleted = true; |
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| 233 | break; |
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| 234 | } |
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| 235 | else if( vec[i]->GetSide() == -1 && vec[i]->GetMayBeKilled()) |
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| 236 | { |
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| 237 | pMass = vec[i]->GetMass()/GeV; |
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| 238 | for( G4int j=i; j<(vecLen-1); ++j )*vec[j] = *vec[j+1]; // shift up |
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| 239 | --backwardCount; |
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| 240 | backwardEnergy += pMass; |
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| 241 | backwardMass -= pMass; |
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| 242 | secondaryDeleted = true; |
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| 243 | break; |
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| 244 | } |
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| 245 | } // breaks go down to here |
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| 246 | |
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| 247 | if( secondaryDeleted ) |
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| 248 | { |
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| 249 | delete vec[vecLen-1]; |
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| 250 | --vecLen; |
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| 251 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
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| 252 | } |
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| 253 | else |
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| 254 | { |
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| 255 | if( vecLen == 0 ) return false; // all secondaries have been eliminated |
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| 256 | if( targetParticle.GetSide() == -1 ) |
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| 257 | { |
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| 258 | pMass = targetParticle.GetMass()/GeV; |
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| 259 | targetParticle = *vec[0]; |
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| 260 | for( G4int j=0; j<(vecLen-1); ++j )*vec[j] = *vec[j+1]; // shift up |
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| 261 | --backwardCount; |
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| 262 | backwardEnergy += pMass; |
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| 263 | backwardMass -= pMass; |
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| 264 | secondaryDeleted = true; |
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| 265 | } |
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| 266 | else if( targetParticle.GetSide() == 1 ) |
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| 267 | { |
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| 268 | pMass = targetParticle.GetMass()/GeV; |
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| 269 | targetParticle = *vec[0]; |
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| 270 | for( G4int j=0; j<(vecLen-1); ++j )*vec[j] = *vec[j+1]; // shift up |
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| 271 | --forwardCount; |
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| 272 | forwardEnergy += pMass; |
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| 273 | forwardMass -= pMass; |
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| 274 | secondaryDeleted = true; |
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| 275 | } |
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| 276 | |
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| 277 | if( secondaryDeleted ) |
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| 278 | { |
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| 279 | delete vec[vecLen-1]; |
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| 280 | --vecLen; |
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| 281 | } |
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| 282 | else |
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| 283 | { |
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| 284 | if( currentParticle.GetSide() == -1 ) |
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| 285 | { |
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| 286 | pMass = currentParticle.GetMass()/GeV; |
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| 287 | currentParticle = *vec[0]; |
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| 288 | for( G4int j=0; j<(vecLen-1); ++j )*vec[j] = *vec[j+1]; // shift up |
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| 289 | --backwardCount; |
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| 290 | backwardEnergy += pMass; |
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| 291 | backwardMass -= pMass; |
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| 292 | secondaryDeleted = true; |
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| 293 | } |
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| 294 | else if( currentParticle.GetSide() == 1 ) |
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| 295 | { |
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| 296 | pMass = currentParticle.GetMass()/GeV; |
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| 297 | currentParticle = *vec[0]; |
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| 298 | for( G4int j=0; j<(vecLen-1); ++j )*vec[j] = *vec[j+1]; // shift up |
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| 299 | --forwardCount; |
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| 300 | forwardEnergy += pMass; |
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| 301 | forwardMass -= pMass; |
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| 302 | secondaryDeleted = true; |
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| 303 | } |
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| 304 | if( secondaryDeleted ) |
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| 305 | { |
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| 306 | delete vec[vecLen-1]; |
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| 307 | --vecLen; |
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| 308 | } |
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| 309 | else break; |
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| 310 | |
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| 311 | } // secondary not deleted |
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| 312 | } // secondary not deleted |
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| 313 | |
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| 314 | eAvailable = centerofmassEnergy - (forwardMass+backwardMass); |
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| 315 | } // while |
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| 316 | |
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| 317 | // |
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| 318 | // This is the start of the TwoCluster function |
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| 319 | // Choose multi-particle resonance masses by sampling |
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| 320 | // P(M) = gc[g(M-M0)]**(c-1) *exp[-(g(M-M0))**c] |
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| 321 | // for M > M0 |
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| 322 | // |
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| 323 | // Use for the forward and backward clusters, but not |
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| 324 | // the cascade cluster |
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| 325 | |
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| 326 | const G4double cpar[] = { 1.60, 1.35, 1.15, 1.10 }; |
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| 327 | const G4double gpar[] = { 2.60, 1.80, 1.30, 1.20 }; |
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| 328 | G4int ntc = 0; |
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| 329 | |
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| 330 | if (forwardCount < 1 || backwardCount < 1) return false; // array bounds protection |
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| 331 | |
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| 332 | G4double rmc = forwardMass; |
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| 333 | if (forwardCount > 1) { |
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| 334 | ntc = std::min(3,forwardCount-2); |
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| 335 | rmc += std::pow(-std::log(1.0-G4UniformRand()),1./cpar[ntc])/gpar[ntc]; |
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| 336 | } |
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| 337 | G4double rmd = backwardMass; |
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| 338 | if( backwardCount > 1 ) { |
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| 339 | ntc = std::min(3,backwardCount-2); |
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| 340 | rmd += std::pow(-std::log(1.0-G4UniformRand()),1./cpar[ntc])/gpar[ntc]; |
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| 341 | } |
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| 342 | |
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| 343 | while( rmc+rmd > centerofmassEnergy ) |
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| 344 | { |
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| 345 | if( (rmc <= forwardMass) && (rmd <= backwardMass) ) |
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| 346 | { |
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| 347 | G4double temp = 0.999*centerofmassEnergy/(rmc+rmd); |
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| 348 | rmc *= temp; |
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| 349 | rmd *= temp; |
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| 350 | } |
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| 351 | else |
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| 352 | { |
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| 353 | rmc = 0.1*forwardMass + 0.9*rmc; |
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| 354 | rmd = 0.1*backwardMass + 0.9*rmd; |
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| 355 | } |
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| 356 | } |
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| 357 | |
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| 358 | G4ReactionProduct pseudoParticle[8]; |
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| 359 | for( i=0; i<8; ++i )pseudoParticle[i].SetZero(); |
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| 360 | |
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| 361 | pseudoParticle[1].SetMass( mOriginal*GeV ); |
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| 362 | pseudoParticle[1].SetTotalEnergy( etOriginal*GeV ); |
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| 363 | pseudoParticle[1].SetMomentum( 0.0, 0.0, pOriginal*GeV ); |
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| 364 | |
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| 365 | pseudoParticle[2].SetMass( protonMass*MeV ); |
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| 366 | pseudoParticle[2].SetTotalEnergy( protonMass*MeV ); |
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| 367 | pseudoParticle[2].SetMomentum( 0.0, 0.0, 0.0 ); |
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| 368 | // |
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| 369 | // transform into center of mass system |
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| 370 | // |
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| 371 | pseudoParticle[0] = pseudoParticle[1] + pseudoParticle[2]; |
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| 372 | pseudoParticle[1].Lorentz( pseudoParticle[1], pseudoParticle[0] ); |
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| 373 | pseudoParticle[2].Lorentz( pseudoParticle[2], pseudoParticle[0] ); |
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| 374 | |
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| 375 | // Calculate cm momentum for forward and backward masses |
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| 376 | // W = sqrt(pf*pf + rmc*rmc) + sqrt(pf*pf + rmd*rmd) |
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| 377 | // Solve for pf |
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| 378 | |
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| 379 | const G4double pfMin = 0.0001; |
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| 380 | G4double pf = (centerofmassEnergy*centerofmassEnergy+rmd*rmd-rmc*rmc); |
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| 381 | pf *= pf; |
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| 382 | pf -= 4*centerofmassEnergy*centerofmassEnergy*rmd*rmd; |
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| 383 | pf = std::sqrt( std::max(pf,pfMin) )/(2.0*centerofmassEnergy); |
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| 384 | // |
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| 385 | // set final state masses and energies in centre of mass system |
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| 386 | // |
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| 387 | pseudoParticle[3].SetMass( rmc*GeV ); |
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| 388 | pseudoParticle[3].SetTotalEnergy( std::sqrt(pf*pf+rmc*rmc)*GeV ); |
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| 389 | |
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| 390 | pseudoParticle[4].SetMass( rmd*GeV ); |
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| 391 | pseudoParticle[4].SetTotalEnergy( std::sqrt(pf*pf+rmd*rmd)*GeV ); |
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| 392 | |
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| 393 | // |
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| 394 | // Get cm scattering angle by sampling t from tmin to tmax |
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| 395 | // |
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| 396 | const G4double bMin = 0.01; |
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| 397 | const G4double b1 = 4.0; |
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| 398 | const G4double b2 = 1.6; |
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| 399 | G4double pin = pseudoParticle[1].GetMomentum().mag()/GeV; |
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| 400 | G4double dtb = 4.0*pin*pf*std::max( bMin, b1+b2*std::log(pOriginal) ); |
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| 401 | G4double factor = 1.0 - std::exp(-dtb); |
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| 402 | G4double costheta = 1.0 + 2.0*std::log(1.0 - G4UniformRand()*factor) / dtb; |
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| 403 | |
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| 404 | costheta = std::max(-1.0, std::min(1.0, costheta)); |
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| 405 | G4double sintheta = std::sqrt((1.0-costheta)*(1.0+costheta)); |
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| 406 | G4double phi = G4UniformRand() * twopi; |
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| 407 | // |
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| 408 | // calculate final state momenta in centre of mass system |
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| 409 | // |
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| 410 | pseudoParticle[3].SetMomentum( pf*sintheta*std::cos(phi)*GeV, |
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| 411 | pf*sintheta*std::sin(phi)*GeV, |
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| 412 | pf*costheta*GeV ); |
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| 413 | pseudoParticle[4].SetMomentum( -pseudoParticle[3].GetMomentum()); |
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| 414 | |
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| 415 | // Backward cluster of nucleons and pions from intra-nuclear cascade |
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| 416 | // Set up in lab system and transform to cms |
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| 417 | |
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| 418 | G4double pp, pp1; |
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| 419 | if( nuclearExcitationCount > 0 ) |
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| 420 | { |
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| 421 | const G4double ga = 1.2; |
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| 422 | G4double ekit1 = 0.04; |
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| 423 | G4double ekit2 = 0.6; // Max KE of cascade particle |
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| 424 | if( ekOriginal <= 5.0 ) |
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| 425 | { |
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| 426 | ekit1 *= ekOriginal*ekOriginal/25.0; |
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| 427 | ekit2 *= ekOriginal*ekOriginal/25.0; |
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| 428 | } |
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| 429 | G4double scale = std::pow(ekit2/ekit1, 1.0-ga) - 1.0; |
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| 430 | for( i=0; i<vecLen; ++i ) |
---|
| 431 | { |
---|
| 432 | if( vec[i]->GetSide() == -2 ) |
---|
| 433 | { |
---|
| 434 | G4double kineticE = ekit1*std::pow((1.0 + G4UniformRand()*scale), 1.0/(1.0-ga) ); |
---|
| 435 | vec[i]->SetKineticEnergy( kineticE*GeV ); |
---|
| 436 | G4double vMass = vec[i]->GetMass()/MeV; |
---|
| 437 | G4double totalE = kineticE*GeV + vMass; |
---|
| 438 | pp = std::sqrt( std::abs(totalE*totalE-vMass*vMass) ); |
---|
| 439 | G4double cost = std::min( 1.0, std::max( -1.0, std::log(2.23*G4UniformRand()+0.383)/0.96 ) ); |
---|
| 440 | G4double sint = std::sqrt(1.0-cost*cost); |
---|
| 441 | phi = twopi*G4UniformRand(); |
---|
| 442 | vec[i]->SetMomentum( pp*sint*std::cos(phi)*MeV, |
---|
| 443 | pp*sint*std::sin(phi)*MeV, |
---|
| 444 | pp*cost*MeV ); |
---|
| 445 | vec[i]->Lorentz( *vec[i], pseudoParticle[0] ); |
---|
| 446 | } |
---|
| 447 | } |
---|
| 448 | } |
---|
| 449 | |
---|
| 450 | // |
---|
| 451 | // Fragmentation of forward and backward clusters |
---|
| 452 | // |
---|
| 453 | |
---|
| 454 | currentParticle.SetMomentum( pseudoParticle[3].GetMomentum() ); |
---|
| 455 | currentParticle.SetTotalEnergy( pseudoParticle[3].GetTotalEnergy() ); |
---|
| 456 | |
---|
| 457 | targetParticle.SetMomentum( pseudoParticle[4].GetMomentum() ); |
---|
| 458 | targetParticle.SetTotalEnergy( pseudoParticle[4].GetTotalEnergy() ); |
---|
| 459 | |
---|
| 460 | pseudoParticle[5].SetMomentum( pseudoParticle[3].GetMomentum() * (-1.0) ); |
---|
| 461 | pseudoParticle[5].SetMass( pseudoParticle[3].GetMass() ); |
---|
| 462 | pseudoParticle[5].SetTotalEnergy( pseudoParticle[3].GetTotalEnergy() ); |
---|
| 463 | |
---|
| 464 | pseudoParticle[6].SetMomentum( pseudoParticle[4].GetMomentum() * (-1.0) ); |
---|
| 465 | pseudoParticle[6].SetMass( pseudoParticle[4].GetMass() ); |
---|
| 466 | pseudoParticle[6].SetTotalEnergy( pseudoParticle[4].GetTotalEnergy() ); |
---|
| 467 | |
---|
| 468 | G4double wgt; |
---|
| 469 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
| 470 | if( forwardCount > 1 ) // tempV will contain the forward particles |
---|
| 471 | { |
---|
| 472 | G4FastVector<G4ReactionProduct,256> tempV; |
---|
| 473 | tempV.Initialize( forwardCount ); |
---|
| 474 | G4bool constantCrossSection = true; |
---|
| 475 | G4int tempLen = 0; |
---|
| 476 | if( currentParticle.GetSide() == 1 ) |
---|
| 477 | tempV.SetElement( tempLen++, ¤tParticle ); |
---|
| 478 | if( targetParticle.GetSide() == 1 ) |
---|
| 479 | tempV.SetElement( tempLen++, &targetParticle ); |
---|
| 480 | for( i=0; i<vecLen; ++i ) |
---|
| 481 | { |
---|
| 482 | if( vec[i]->GetSide() == 1 ) |
---|
| 483 | { |
---|
| 484 | if( tempLen < 18 ) |
---|
| 485 | tempV.SetElement( tempLen++, vec[i] ); |
---|
| 486 | else |
---|
| 487 | { |
---|
| 488 | vec[i]->SetSide( -1 ); |
---|
| 489 | continue; |
---|
| 490 | } |
---|
| 491 | } |
---|
| 492 | } |
---|
| 493 | if( tempLen >= 2 ) |
---|
| 494 | { |
---|
| 495 | wgt = GenerateNBodyEvent( pseudoParticle[3].GetMass()/MeV, |
---|
| 496 | constantCrossSection, tempV, tempLen ); |
---|
| 497 | if( currentParticle.GetSide() == 1 ) |
---|
| 498 | currentParticle.Lorentz( currentParticle, pseudoParticle[5] ); |
---|
| 499 | if( targetParticle.GetSide() == 1 ) |
---|
| 500 | targetParticle.Lorentz( targetParticle, pseudoParticle[5] ); |
---|
| 501 | for( i=0; i<vecLen; ++i ) |
---|
| 502 | { |
---|
| 503 | if( vec[i]->GetSide() == 1 )vec[i]->Lorentz( *vec[i], pseudoParticle[5] ); |
---|
| 504 | } |
---|
| 505 | } |
---|
| 506 | } |
---|
| 507 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
| 508 | if( backwardCount > 1 ) // tempV will contain the backward particles, |
---|
| 509 | { // but not those created from the intranuclear cascade |
---|
| 510 | G4FastVector<G4ReactionProduct,256> tempV; |
---|
| 511 | tempV.Initialize( backwardCount ); |
---|
| 512 | G4bool constantCrossSection = true; |
---|
| 513 | G4int tempLen = 0; |
---|
| 514 | if( currentParticle.GetSide() == -1 ) |
---|
| 515 | tempV.SetElement( tempLen++, ¤tParticle ); |
---|
| 516 | if( targetParticle.GetSide() == -1 ) |
---|
| 517 | tempV.SetElement( tempLen++, &targetParticle ); |
---|
| 518 | for( i=0; i<vecLen; ++i ) |
---|
| 519 | { |
---|
| 520 | if( vec[i]->GetSide() == -1 ) |
---|
| 521 | { |
---|
| 522 | if( tempLen < 18 ) |
---|
| 523 | tempV.SetElement( tempLen++, vec[i] ); |
---|
| 524 | else |
---|
| 525 | { |
---|
| 526 | vec[i]->SetSide( -2 ); |
---|
| 527 | vec[i]->SetKineticEnergy( 0.0 ); |
---|
| 528 | vec[i]->SetMomentum( 0.0, 0.0, 0.0 ); |
---|
| 529 | continue; |
---|
| 530 | } |
---|
| 531 | } |
---|
| 532 | } |
---|
| 533 | if( tempLen >= 2 ) |
---|
| 534 | { |
---|
| 535 | wgt = GenerateNBodyEvent( pseudoParticle[4].GetMass()/MeV, |
---|
| 536 | constantCrossSection, tempV, tempLen ); |
---|
| 537 | if( currentParticle.GetSide() == -1 ) |
---|
| 538 | currentParticle.Lorentz( currentParticle, pseudoParticle[6] ); |
---|
| 539 | if( targetParticle.GetSide() == -1 ) |
---|
| 540 | targetParticle.Lorentz( targetParticle, pseudoParticle[6] ); |
---|
| 541 | for( i=0; i<vecLen; ++i ) |
---|
| 542 | { |
---|
| 543 | if( vec[i]->GetSide() == -1 )vec[i]->Lorentz( *vec[i], pseudoParticle[6] ); |
---|
| 544 | } |
---|
| 545 | } |
---|
| 546 | } |
---|
| 547 | |
---|
| 548 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
| 549 | // |
---|
| 550 | // Lorentz transformation in lab system |
---|
| 551 | // |
---|
| 552 | currentParticle.Lorentz( currentParticle, pseudoParticle[2] ); |
---|
| 553 | targetParticle.Lorentz( targetParticle, pseudoParticle[2] ); |
---|
| 554 | for( i=0; i<vecLen; ++i ) vec[i]->Lorentz( *vec[i], pseudoParticle[2] ); |
---|
| 555 | |
---|
| 556 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
| 557 | // |
---|
| 558 | // sometimes the leading strange particle is lost, set it back |
---|
| 559 | // |
---|
| 560 | G4bool dum = true; |
---|
| 561 | if( leadFlag ) |
---|
| 562 | { |
---|
| 563 | // leadFlag will be true |
---|
| 564 | // iff original particle is strange AND if incident particle is strange |
---|
| 565 | // leadFlag is set to the incident particle |
---|
| 566 | // or |
---|
| 567 | // target particle is strange leadFlag is set to the target particle |
---|
| 568 | |
---|
| 569 | if( currentParticle.GetDefinition() == leadingStrangeParticle.GetDefinition() ) |
---|
| 570 | dum = false; |
---|
| 571 | else if( targetParticle.GetDefinition() == leadingStrangeParticle.GetDefinition() ) |
---|
| 572 | dum = false; |
---|
| 573 | else |
---|
| 574 | { |
---|
| 575 | for( i=0; i<vecLen; ++i ) |
---|
| 576 | { |
---|
| 577 | if( vec[i]->GetDefinition() == leadingStrangeParticle.GetDefinition() ) |
---|
| 578 | { |
---|
| 579 | dum = false; |
---|
| 580 | break; |
---|
| 581 | } |
---|
| 582 | } |
---|
| 583 | } |
---|
| 584 | if( dum ) |
---|
| 585 | { |
---|
| 586 | G4double leadMass = leadingStrangeParticle.GetMass()/MeV; |
---|
| 587 | G4double ekin; |
---|
| 588 | if( ((leadMass < protonMass) && (targetParticle.GetMass()/MeV < protonMass)) || |
---|
| 589 | ((leadMass >= protonMass) && (targetParticle.GetMass()/MeV >= protonMass)) ) |
---|
| 590 | { |
---|
| 591 | ekin = targetParticle.GetKineticEnergy()/GeV; |
---|
| 592 | pp1 = targetParticle.GetMomentum().mag()/MeV; // old momentum |
---|
| 593 | targetParticle.SetDefinition( leadingStrangeParticle.GetDefinition() ); |
---|
| 594 | targetParticle.SetKineticEnergy( ekin*GeV ); |
---|
| 595 | pp = targetParticle.GetTotalMomentum()/MeV; // new momentum |
---|
| 596 | if( pp1 < 1.0e-3 ) { |
---|
| 597 | G4ThreeVector iso = Isotropic(pp); |
---|
| 598 | targetParticle.SetMomentum( iso.x(), iso.y(), iso.z() ); |
---|
| 599 | } else { |
---|
| 600 | targetParticle.SetMomentum( targetParticle.GetMomentum() * (pp/pp1) ); |
---|
| 601 | } |
---|
| 602 | targetHasChanged = true; |
---|
| 603 | } |
---|
| 604 | else |
---|
| 605 | { |
---|
| 606 | ekin = currentParticle.GetKineticEnergy()/GeV; |
---|
| 607 | pp1 = currentParticle.GetMomentum().mag()/MeV; |
---|
| 608 | currentParticle.SetDefinition( leadingStrangeParticle.GetDefinition() ); |
---|
| 609 | currentParticle.SetKineticEnergy( ekin*GeV ); |
---|
| 610 | pp = currentParticle.GetTotalMomentum()/MeV; |
---|
| 611 | if( pp1 < 1.0e-3 ) { |
---|
| 612 | G4ThreeVector iso = Isotropic(pp); |
---|
| 613 | currentParticle.SetMomentum( iso.x(), iso.y(), iso.z() ); |
---|
| 614 | } else { |
---|
| 615 | currentParticle.SetMomentum( currentParticle.GetMomentum() * (pp/pp1) ); |
---|
| 616 | } |
---|
| 617 | incidentHasChanged = true; |
---|
| 618 | } |
---|
| 619 | } |
---|
| 620 | } // end of if( leadFlag ) |
---|
| 621 | |
---|
| 622 | // Get number of final state nucleons and nucleons remaining in |
---|
| 623 | // target nucleus |
---|
| 624 | |
---|
| 625 | std::pair<G4int, G4int> finalStateNucleons = |
---|
| 626 | GetFinalStateNucleons(originalTarget, vec, vecLen); |
---|
| 627 | |
---|
| 628 | G4int protonsInFinalState = finalStateNucleons.first; |
---|
| 629 | G4int neutronsInFinalState = finalStateNucleons.second; |
---|
| 630 | |
---|
| 631 | G4int numberofFinalStateNucleons = |
---|
| 632 | protonsInFinalState + neutronsInFinalState; |
---|
| 633 | |
---|
| 634 | if (currentParticle.GetDefinition()->GetBaryonNumber() == 1 && |
---|
| 635 | targetParticle.GetDefinition()->GetBaryonNumber() == 1 && |
---|
| 636 | originalIncident->GetDefinition()->GetPDGMass() < |
---|
| 637 | G4Lambda::Lambda()->GetPDGMass()) |
---|
| 638 | numberofFinalStateNucleons++; |
---|
| 639 | |
---|
| 640 | numberofFinalStateNucleons = std::max(1, numberofFinalStateNucleons); |
---|
| 641 | |
---|
| 642 | G4int PinNucleus = std::max(0, |
---|
| 643 | G4int(targetNucleus.GetZ()) - protonsInFinalState); |
---|
| 644 | G4int NinNucleus = std::max(0, |
---|
| 645 | G4int(targetNucleus.GetN()-targetNucleus.GetZ()) - neutronsInFinalState); |
---|
| 646 | // |
---|
| 647 | // for various reasons, the energy balance is not sufficient, |
---|
| 648 | // check that, energy balance, angle of final system, etc. |
---|
| 649 | // |
---|
| 650 | pseudoParticle[4].SetMass( mOriginal*GeV ); |
---|
| 651 | pseudoParticle[4].SetTotalEnergy( etOriginal*GeV ); |
---|
| 652 | pseudoParticle[4].SetMomentum( 0.0, 0.0, pOriginal*GeV ); |
---|
| 653 | |
---|
| 654 | G4ParticleDefinition * aOrgDef = modifiedOriginal.GetDefinition(); |
---|
| 655 | G4int diff = 0; |
---|
| 656 | if(aOrgDef == G4Proton::Proton() || aOrgDef == G4Neutron::Neutron() ) diff = 1; |
---|
| 657 | if(numberofFinalStateNucleons == 1) diff = 0; |
---|
| 658 | pseudoParticle[5].SetMomentum( 0.0, 0.0, 0.0 ); |
---|
| 659 | pseudoParticle[5].SetMass( protonMass*(numberofFinalStateNucleons-diff)*MeV); |
---|
| 660 | pseudoParticle[5].SetTotalEnergy( protonMass*(numberofFinalStateNucleons-diff)*MeV); |
---|
| 661 | |
---|
| 662 | G4double theoreticalKinetic = |
---|
| 663 | pseudoParticle[4].GetTotalEnergy()/GeV + pseudoParticle[5].GetTotalEnergy()/GeV; |
---|
| 664 | |
---|
| 665 | pseudoParticle[6] = pseudoParticle[4] + pseudoParticle[5]; |
---|
| 666 | pseudoParticle[4].Lorentz( pseudoParticle[4], pseudoParticle[6] ); |
---|
| 667 | pseudoParticle[5].Lorentz( pseudoParticle[5], pseudoParticle[6] ); |
---|
| 668 | |
---|
| 669 | if( vecLen < 16 ) |
---|
| 670 | { |
---|
| 671 | G4ReactionProduct tempR[130]; |
---|
| 672 | tempR[0] = currentParticle; |
---|
| 673 | tempR[1] = targetParticle; |
---|
| 674 | for( i=0; i<vecLen; ++i )tempR[i+2] = *vec[i]; |
---|
| 675 | |
---|
| 676 | G4FastVector<G4ReactionProduct,256> tempV; |
---|
| 677 | tempV.Initialize( vecLen+2 ); |
---|
| 678 | G4bool constantCrossSection = true; |
---|
| 679 | G4int tempLen = 0; |
---|
| 680 | for( i=0; i<vecLen+2; ++i )tempV.SetElement( tempLen++, &tempR[i] ); |
---|
| 681 | |
---|
| 682 | if( tempLen >= 2 ) |
---|
| 683 | { |
---|
| 684 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
| 685 | wgt = GenerateNBodyEvent( pseudoParticle[4].GetTotalEnergy()/MeV + |
---|
| 686 | pseudoParticle[5].GetTotalEnergy()/MeV, |
---|
| 687 | constantCrossSection, tempV, tempLen ); |
---|
| 688 | if (wgt == -1) { |
---|
| 689 | G4double Qvalue = 0; |
---|
| 690 | for (i = 0; i < tempLen; i++) Qvalue += tempV[i]->GetMass(); |
---|
| 691 | wgt = GenerateNBodyEvent( Qvalue/MeV, |
---|
| 692 | constantCrossSection, tempV, tempLen ); |
---|
| 693 | } |
---|
| 694 | theoreticalKinetic = 0.0; |
---|
| 695 | for( i=0; i<vecLen+2; ++i ) |
---|
| 696 | { |
---|
| 697 | pseudoParticle[7].SetMomentum( tempV[i]->GetMomentum() ); |
---|
| 698 | pseudoParticle[7].SetMass( tempV[i]->GetMass() ); |
---|
| 699 | pseudoParticle[7].SetTotalEnergy( tempV[i]->GetTotalEnergy() ); |
---|
| 700 | pseudoParticle[7].Lorentz( pseudoParticle[7], pseudoParticle[5] ); |
---|
| 701 | theoreticalKinetic += pseudoParticle[7].GetKineticEnergy()/GeV; |
---|
| 702 | } |
---|
| 703 | } |
---|
| 704 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
| 705 | } |
---|
| 706 | else |
---|
| 707 | { |
---|
| 708 | theoreticalKinetic -= |
---|
| 709 | ( currentParticle.GetMass()/GeV + targetParticle.GetMass()/GeV ); |
---|
| 710 | for( i=0; i<vecLen; ++i )theoreticalKinetic -= vec[i]->GetMass()/GeV; |
---|
| 711 | } |
---|
| 712 | G4double simulatedKinetic = |
---|
| 713 | currentParticle.GetKineticEnergy()/GeV + targetParticle.GetKineticEnergy()/GeV; |
---|
| 714 | for( i=0; i<vecLen; ++i )simulatedKinetic += vec[i]->GetKineticEnergy()/GeV; |
---|
| 715 | |
---|
| 716 | // make sure that kinetic energies are correct |
---|
| 717 | // the backward nucleon cluster is not produced within proper kinematics!!! |
---|
| 718 | |
---|
| 719 | if( simulatedKinetic != 0.0 ) |
---|
| 720 | { |
---|
| 721 | wgt = (theoreticalKinetic)/simulatedKinetic; |
---|
| 722 | currentParticle.SetKineticEnergy( wgt*currentParticle.GetKineticEnergy() ); |
---|
| 723 | pp = currentParticle.GetTotalMomentum()/MeV; |
---|
| 724 | pp1 = currentParticle.GetMomentum().mag()/MeV; |
---|
| 725 | if( pp1 < 0.001*MeV ) { |
---|
| 726 | G4ThreeVector iso = Isotropic(pp); |
---|
| 727 | currentParticle.SetMomentum( iso.x(), iso.y(), iso.z() ); |
---|
| 728 | } else { |
---|
| 729 | currentParticle.SetMomentum( currentParticle.GetMomentum() * (pp/pp1) ); |
---|
| 730 | } |
---|
| 731 | |
---|
| 732 | targetParticle.SetKineticEnergy( wgt*targetParticle.GetKineticEnergy() ); |
---|
| 733 | pp = targetParticle.GetTotalMomentum()/MeV; |
---|
| 734 | pp1 = targetParticle.GetMomentum().mag()/MeV; |
---|
| 735 | if( pp1 < 0.001*MeV ) { |
---|
| 736 | G4ThreeVector iso = Isotropic(pp); |
---|
| 737 | targetParticle.SetMomentum( iso.x(), iso.y(), iso.z() ); |
---|
| 738 | } else { |
---|
| 739 | targetParticle.SetMomentum( targetParticle.GetMomentum() * (pp/pp1) ); |
---|
| 740 | } |
---|
| 741 | |
---|
| 742 | for( i=0; i<vecLen; ++i ) |
---|
| 743 | { |
---|
| 744 | vec[i]->SetKineticEnergy( wgt*vec[i]->GetKineticEnergy() ); |
---|
| 745 | pp = vec[i]->GetTotalMomentum()/MeV; |
---|
| 746 | pp1 = vec[i]->GetMomentum().mag()/MeV; |
---|
| 747 | if( pp1 < 0.001 ) { |
---|
| 748 | G4ThreeVector iso = Isotropic(pp); |
---|
| 749 | vec[i]->SetMomentum( iso.x(), iso.y(), iso.z() ); |
---|
| 750 | } else { |
---|
| 751 | vec[i]->SetMomentum( vec[i]->GetMomentum() * (pp/pp1) ); |
---|
| 752 | } |
---|
| 753 | } |
---|
| 754 | } |
---|
| 755 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
| 756 | |
---|
| 757 | Rotate( numberofFinalStateNucleons, pseudoParticle[4].GetMomentum(), |
---|
| 758 | modifiedOriginal, originalIncident, targetNucleus, |
---|
| 759 | currentParticle, targetParticle, vec, vecLen ); |
---|
| 760 | |
---|
| 761 | // Add black track particles |
---|
| 762 | // the total number of particles produced is restricted to 198 |
---|
| 763 | // this may have influence on very high energies |
---|
| 764 | |
---|
| 765 | if( atomicWeight >= 1.5 ) |
---|
| 766 | { |
---|
| 767 | // npnb is number of proton/neutron black track particles |
---|
| 768 | // ndta is the number of deuterons, tritons, and alphas produced |
---|
| 769 | // epnb is the kinetic energy available for proton/neutron black track |
---|
| 770 | // particles |
---|
| 771 | // edta is the kinetic energy available for deuteron/triton/alpha |
---|
| 772 | // particles |
---|
| 773 | |
---|
| 774 | G4int npnb = 0; |
---|
| 775 | G4int ndta = 0; |
---|
| 776 | |
---|
| 777 | G4double epnb, edta; |
---|
| 778 | if (veryForward) { |
---|
| 779 | epnb = targetNucleus.GetAnnihilationPNBlackTrackEnergy(); |
---|
| 780 | edta = targetNucleus.GetAnnihilationDTABlackTrackEnergy(); |
---|
| 781 | } else { |
---|
| 782 | epnb = targetNucleus.GetPNBlackTrackEnergy(); |
---|
| 783 | edta = targetNucleus.GetDTABlackTrackEnergy(); |
---|
| 784 | } |
---|
| 785 | |
---|
| 786 | const G4double pnCutOff = 0.001; // GeV |
---|
| 787 | const G4double dtaCutOff = 0.001; // GeV |
---|
[962] | 788 | // const G4double kineticMinimum = 1.e-6; |
---|
| 789 | // const G4double kineticFactor = -0.005; |
---|
[819] | 790 | |
---|
[962] | 791 | // G4double sprob = 0.0; // sprob = probability of self-absorption in |
---|
[819] | 792 | // heavy molecules |
---|
[962] | 793 | // Not currently used (DHW 9 June 2008) const G4double ekIncident = originalIncident->GetKineticEnergy()/GeV; |
---|
| 794 | // if( ekIncident >= 5.0 )sprob = std::min( 1.0, 0.6*std::log(ekIncident-4.0) ); |
---|
[819] | 795 | |
---|
| 796 | if( epnb >= pnCutOff ) |
---|
| 797 | { |
---|
| 798 | npnb = G4Poisson((1.5+1.25*numberofFinalStateNucleons)*epnb/(epnb+edta)); |
---|
| 799 | if( numberofFinalStateNucleons + npnb > atomicWeight ) |
---|
| 800 | npnb = G4int(atomicWeight - numberofFinalStateNucleons); |
---|
| 801 | npnb = std::min( npnb, 127-vecLen ); |
---|
| 802 | } |
---|
| 803 | if( edta >= dtaCutOff ) |
---|
| 804 | { |
---|
| 805 | ndta = G4Poisson( (1.5+1.25*numberofFinalStateNucleons)*edta/(epnb+edta) ); |
---|
| 806 | ndta = std::min( ndta, 127-vecLen ); |
---|
| 807 | } |
---|
| 808 | if (npnb == 0 && ndta == 0) npnb = 1; |
---|
| 809 | |
---|
| 810 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
| 811 | |
---|
[962] | 812 | AddBlackTrackParticles(epnb, npnb, edta, ndta, modifiedOriginal, |
---|
[819] | 813 | PinNucleus, NinNucleus, targetNucleus, |
---|
| 814 | vec, vecLen ); |
---|
| 815 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
| 816 | } |
---|
| 817 | |
---|
| 818 | //if( centerofmassEnergy <= (4.0+G4UniformRand()) ) |
---|
| 819 | // MomentumCheck( modifiedOriginal, currentParticle, targetParticle, vec, vecLen ); |
---|
| 820 | // |
---|
| 821 | // calculate time delay for nuclear reactions |
---|
| 822 | // |
---|
| 823 | if( (atomicWeight >= 1.5) && (atomicWeight <= 230.0) && (ekOriginal <= 0.2) ) |
---|
| 824 | currentParticle.SetTOF( 1.0-500.0*std::exp(-ekOriginal/0.04)*std::log(G4UniformRand()) ); |
---|
| 825 | else |
---|
| 826 | currentParticle.SetTOF( 1.0 ); |
---|
| 827 | |
---|
| 828 | return true; |
---|
| 829 | } |
---|
| 830 | |
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| 831 | /* end of file */ |
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