[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 | // |
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| 27 | // $Id: G4LEAntiLambdaInelastic.cc,v 1.11 2006/06/29 20:44:41 gunter Exp $ |
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[1007] | 28 | // GEANT4 tag $Name: geant4-09-02 $ |
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[819] | 29 | // |
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| 30 | // Hadronic Process: AntiLambda Inelastic Process |
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| 31 | // J.L. Chuma, TRIUMF, 19-Feb-1997 |
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| 32 | // Last modified: 27-Mar-1997 |
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| 33 | // Modified by J.L.Chuma 30-Apr-97: added originalTarget for CalculateMomenta |
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| 34 | |
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| 35 | #include "G4LEAntiLambdaInelastic.hh" |
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| 36 | #include "Randomize.hh" |
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| 37 | |
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| 38 | G4HadFinalState * |
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| 39 | G4LEAntiLambdaInelastic::ApplyYourself( const G4HadProjectile &aTrack, |
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| 40 | G4Nucleus &targetNucleus ) |
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| 41 | { |
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| 42 | const G4HadProjectile *originalIncident = &aTrack; |
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| 43 | // |
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| 44 | // create the target particle |
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| 45 | // |
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| 46 | G4DynamicParticle *originalTarget = targetNucleus.ReturnTargetParticle(); |
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| 47 | |
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| 48 | if( verboseLevel > 1 ) |
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| 49 | { |
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| 50 | const G4Material *targetMaterial = aTrack.GetMaterial(); |
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| 51 | G4cout << "G4LEAntiLambdaInelastic::ApplyYourself called" << G4endl; |
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| 52 | G4cout << "kinetic energy = " << originalIncident->GetKineticEnergy()/MeV << "MeV, "; |
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| 53 | G4cout << "target material = " << targetMaterial->GetName() << ", "; |
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| 54 | G4cout << "target particle = " << originalTarget->GetDefinition()->GetParticleName() |
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| 55 | << G4endl; |
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| 56 | } |
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| 57 | // |
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| 58 | // Fermi motion and evaporation |
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| 59 | // As of Geant3, the Fermi energy calculation had not been Done |
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| 60 | // |
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| 61 | G4double ek = originalIncident->GetKineticEnergy()/MeV; |
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| 62 | G4double amas = originalIncident->GetDefinition()->GetPDGMass()/MeV; |
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| 63 | G4ReactionProduct modifiedOriginal; |
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| 64 | modifiedOriginal = *originalIncident; |
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| 65 | |
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| 66 | G4double tkin = targetNucleus.Cinema( ek ); |
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| 67 | ek += tkin; |
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| 68 | modifiedOriginal.SetKineticEnergy( ek*MeV ); |
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| 69 | G4double et = ek + amas; |
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| 70 | G4double p = std::sqrt( std::abs((et-amas)*(et+amas)) ); |
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| 71 | G4double pp = modifiedOriginal.GetMomentum().mag()/MeV; |
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| 72 | if( pp > 0.0 ) |
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| 73 | { |
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| 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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| 80 | tkin = targetNucleus.EvaporationEffects( ek ); |
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| 81 | ek -= tkin; |
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| 82 | modifiedOriginal.SetKineticEnergy( ek*MeV ); |
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| 83 | et = ek + amas; |
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| 84 | p = std::sqrt( std::abs((et-amas)*(et+amas)) ); |
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| 85 | pp = modifiedOriginal.GetMomentum().mag()/MeV; |
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| 86 | if( pp > 0.0 ) |
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| 87 | { |
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| 88 | G4ThreeVector momentum = modifiedOriginal.GetMomentum(); |
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| 89 | modifiedOriginal.SetMomentum( momentum * (p/pp) ); |
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| 90 | } |
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| 91 | |
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| 92 | G4ReactionProduct currentParticle = modifiedOriginal; |
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| 93 | G4ReactionProduct targetParticle; |
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| 94 | targetParticle = *originalTarget; |
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| 95 | currentParticle.SetSide( 1 ); // incident always goes in forward hemisphere |
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| 96 | targetParticle.SetSide( -1 ); // target always goes in backward hemisphere |
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| 97 | G4bool incidentHasChanged = false; |
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| 98 | G4bool targetHasChanged = false; |
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| 99 | G4bool quasiElastic = false; |
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| 100 | G4FastVector<G4ReactionProduct,GHADLISTSIZE> vec; // vec will contain the secondary particles |
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| 101 | G4int vecLen = 0; |
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| 102 | vec.Initialize( 0 ); |
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| 103 | |
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| 104 | const G4double cutOff = 0.1; |
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| 105 | const G4double anni = std::min( 1.3*currentParticle.GetTotalMomentum()/GeV, 0.4 ); |
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| 106 | if( (originalIncident->GetKineticEnergy()/MeV > cutOff) || (G4UniformRand() > anni) ) |
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| 107 | Cascade( vec, vecLen, |
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| 108 | originalIncident, currentParticle, targetParticle, |
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| 109 | incidentHasChanged, targetHasChanged, quasiElastic ); |
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| 110 | |
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| 111 | CalculateMomenta( vec, vecLen, |
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| 112 | originalIncident, originalTarget, modifiedOriginal, |
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| 113 | targetNucleus, currentParticle, targetParticle, |
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| 114 | incidentHasChanged, targetHasChanged, quasiElastic ); |
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| 115 | |
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| 116 | SetUpChange( vec, vecLen, |
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| 117 | currentParticle, targetParticle, |
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| 118 | incidentHasChanged ); |
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| 119 | |
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| 120 | delete originalTarget; |
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| 121 | return &theParticleChange; |
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| 122 | } |
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| 123 | |
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| 124 | void |
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| 125 | G4LEAntiLambdaInelastic::Cascade( |
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| 126 | G4FastVector<G4ReactionProduct,GHADLISTSIZE> &vec, |
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| 127 | G4int &vecLen, |
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| 128 | const G4HadProjectile *originalIncident, |
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| 129 | G4ReactionProduct ¤tParticle, |
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| 130 | G4ReactionProduct &targetParticle, |
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| 131 | G4bool &incidentHasChanged, |
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| 132 | G4bool &targetHasChanged, |
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| 133 | G4bool &quasiElastic ) |
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| 134 | { |
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| 135 | // derived from original FORTRAN code CASAL0 by H. Fesefeldt (13-Sep-1987) |
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| 136 | // |
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| 137 | // AntiLambda undergoes interaction with nucleon within a nucleus. Check if it is |
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| 138 | // energetically possible to produce pions/kaons. In not, assume nuclear excitation |
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| 139 | // occurs and input particle is degraded in energy. No other particles are produced. |
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| 140 | // If reaction is possible, find the correct number of pions/protons/neutrons |
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| 141 | // produced using an interpolation to multiplicity data. Replace some pions or |
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| 142 | // protons/neutrons by kaons or strange baryons according to the average |
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| 143 | // multiplicity per Inelastic reaction. |
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| 144 | // |
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| 145 | const G4double mOriginal = originalIncident->GetDefinition()->GetPDGMass()/MeV; |
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| 146 | const G4double etOriginal = originalIncident->GetTotalEnergy()/MeV; |
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| 147 | const G4double targetMass = targetParticle.GetMass()/MeV; |
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| 148 | const G4double pOriginal = originalIncident->GetTotalMomentum()/GeV; |
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| 149 | G4double centerofmassEnergy = std::sqrt( mOriginal*mOriginal + |
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| 150 | targetMass*targetMass + |
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| 151 | 2.0*targetMass*etOriginal ); |
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| 152 | G4double availableEnergy = centerofmassEnergy-(targetMass+mOriginal); |
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| 153 | |
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| 154 | static G4bool first = true; |
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| 155 | const G4int numMul = 1200; |
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| 156 | const G4int numMulA = 400; |
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| 157 | const G4int numSec = 60; |
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| 158 | static G4double protmul[numMul], protnorm[numSec]; // proton constants |
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| 159 | static G4double neutmul[numMul], neutnorm[numSec]; // neutron constants |
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| 160 | static G4double protmulA[numMulA], protnormA[numSec]; // proton constants |
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| 161 | static G4double neutmulA[numMulA], neutnormA[numSec]; // neutron constants |
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| 162 | // np = number of pi+, nm = number of pi-, nz = number of pi0 |
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| 163 | G4int nt=0, np=0, nm=0, nz=0; |
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| 164 | G4double test; |
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| 165 | const G4double c = 1.25; |
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| 166 | const G4double b[] = { 0.7, 0.7 }; |
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| 167 | if( first ) // compute normalization constants, this will only be Done once |
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| 168 | { |
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| 169 | first = false; |
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| 170 | G4int i; |
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| 171 | for( i=0; i<numMul; ++i )protmul[i] = 0.0; |
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| 172 | for( i=0; i<numSec; ++i )protnorm[i] = 0.0; |
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| 173 | G4int counter = -1; |
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| 174 | for( np=0; np<(numSec/3); ++np ) |
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| 175 | { |
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| 176 | for( nm=std::max(0,np-2); nm<=(np+1); ++nm ) |
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| 177 | { |
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| 178 | for( nz=0; nz<numSec/3; ++nz ) |
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| 179 | { |
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| 180 | if( ++counter < numMul ) |
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| 181 | { |
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| 182 | nt = np+nm+nz; |
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| 183 | if( nt>0 && nt<=numSec ) |
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| 184 | { |
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| 185 | protmul[counter] = Pmltpc(np,nm,nz,nt,b[0],c); |
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| 186 | protnorm[nt-1] += protmul[counter]; |
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| 187 | } |
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| 188 | } |
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| 189 | } |
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| 190 | } |
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| 191 | } |
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| 192 | for( i=0; i<numMul; ++i )neutmul[i] = 0.0; |
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| 193 | for( i=0; i<numSec; ++i )neutnorm[i] = 0.0; |
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| 194 | counter = -1; |
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| 195 | for( np=0; np<numSec/3; ++np ) |
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| 196 | { |
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| 197 | for( nm=std::max(0,np-1); nm<=(np+2); ++nm ) |
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| 198 | { |
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| 199 | for( nz=0; nz<numSec/3; ++nz ) |
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| 200 | { |
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| 201 | if( ++counter < numMul ) |
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| 202 | { |
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| 203 | nt = np+nm+nz; |
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| 204 | if( nt>0 && nt<=numSec ) |
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| 205 | { |
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| 206 | neutmul[counter] = Pmltpc(np,nm,nz,nt,b[1],c); |
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| 207 | neutnorm[nt-1] += neutmul[counter]; |
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| 208 | } |
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| 209 | } |
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| 210 | } |
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| 211 | } |
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| 212 | } |
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| 213 | for( i=0; i<numSec; ++i ) |
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| 214 | { |
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| 215 | if( protnorm[i] > 0.0 )protnorm[i] = 1.0/protnorm[i]; |
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| 216 | if( neutnorm[i] > 0.0 )neutnorm[i] = 1.0/neutnorm[i]; |
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| 217 | } |
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| 218 | // |
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| 219 | // do the same for annihilation channels |
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| 220 | // |
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| 221 | for( i=0; i<numMulA; ++i )protmulA[i] = 0.0; |
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| 222 | for( i=0; i<numSec; ++i )protnormA[i] = 0.0; |
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| 223 | counter = -1; |
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| 224 | for( np=1; np<(numSec/3); ++np ) |
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| 225 | { |
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| 226 | nm = np-1; |
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| 227 | for( nz=0; nz<numSec/3; ++nz ) |
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| 228 | { |
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| 229 | if( ++counter < numMulA ) |
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| 230 | { |
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| 231 | nt = np+nm+nz; |
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| 232 | if( nt>1 && nt<=numSec ) |
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| 233 | { |
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| 234 | protmulA[counter] = Pmltpc(np,nm,nz,nt,b[0],c); |
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| 235 | protnormA[nt-1] += protmulA[counter]; |
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| 236 | } |
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| 237 | } |
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| 238 | } |
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| 239 | } |
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| 240 | for( i=0; i<numMulA; ++i )neutmulA[i] = 0.0; |
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| 241 | for( i=0; i<numSec; ++i )neutnormA[i] = 0.0; |
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| 242 | counter = -1; |
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| 243 | for( np=0; np<numSec/3; ++np ) |
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| 244 | { |
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| 245 | nm = np; |
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| 246 | for( nz=0; nz<numSec/3; ++nz ) |
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| 247 | { |
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| 248 | if( ++counter < numMulA ) |
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| 249 | { |
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| 250 | nt = np+nm+nz; |
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| 251 | if( nt>1 && nt<=numSec ) |
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| 252 | { |
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| 253 | neutmulA[counter] = Pmltpc(np,nm,nz,nt,b[1],c); |
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| 254 | neutnormA[nt-1] += neutmulA[counter]; |
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| 255 | } |
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| 256 | } |
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| 257 | } |
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| 258 | } |
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| 259 | for( i=0; i<numSec; ++i ) |
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| 260 | { |
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| 261 | if( protnormA[i] > 0.0 )protnormA[i] = 1.0/protnormA[i]; |
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| 262 | if( neutnormA[i] > 0.0 )neutnormA[i] = 1.0/neutnormA[i]; |
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| 263 | } |
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| 264 | } // end of initialization |
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| 265 | const G4double expxu = 82.; // upper bound for arg. of exp |
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| 266 | const G4double expxl = -expxu; // lower bound for arg. of exp |
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| 267 | |
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| 268 | G4ParticleDefinition *aNeutron = G4Neutron::Neutron(); |
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| 269 | G4ParticleDefinition *aProton = G4Proton::Proton(); |
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| 270 | G4ParticleDefinition *aPiPlus = G4PionPlus::PionPlus(); |
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| 271 | G4ParticleDefinition *aPiMinus = G4PionMinus::PionMinus(); |
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| 272 | G4ParticleDefinition *aPiZero = G4PionZero::PionZero(); |
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| 273 | G4ParticleDefinition *aKaonPlus = G4KaonPlus::KaonPlus(); |
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| 274 | G4ParticleDefinition *aKaonMinus = G4KaonMinus::KaonMinus(); |
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| 275 | G4ParticleDefinition *aKaonZL = G4KaonZeroLong::KaonZeroLong(); |
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| 276 | G4ParticleDefinition *anAntiSigmaZero = G4AntiSigmaZero::AntiSigmaZero(); |
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| 277 | G4ParticleDefinition *anAntiSigmaPlus = G4AntiSigmaPlus::AntiSigmaPlus(); |
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| 278 | G4ParticleDefinition *anAntiSigmaMinus = G4AntiSigmaMinus::AntiSigmaMinus(); |
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| 279 | const G4double anhl[] = {1.00,1.00,1.00,1.00,1.00,1.00,1.00,1.00,0.97,0.88, |
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| 280 | 0.85,0.81,0.75,0.64,0.64,0.55,0.55,0.45,0.47,0.40, |
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| 281 | 0.39,0.36,0.33,0.10,0.01}; |
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| 282 | G4int iplab = G4int( pOriginal*10.0 ); |
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| 283 | if( iplab > 9 )iplab = G4int( (pOriginal- 1.0)*5.0 ) + 10; |
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| 284 | if( iplab > 14 )iplab = G4int( pOriginal- 2.0 ) + 15; |
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| 285 | if( iplab > 22 )iplab = G4int( (pOriginal-10.0)/10.0 ) + 23; |
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| 286 | if( iplab > 24 )iplab = 24; |
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| 287 | if( G4UniformRand() > anhl[iplab] ) |
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| 288 | { |
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| 289 | if( availableEnergy <= aPiPlus->GetPDGMass()/MeV ) |
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| 290 | { // not energetically possible to produce pion(s) |
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| 291 | quasiElastic = true; |
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| 292 | return; |
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| 293 | } |
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| 294 | G4double n, anpn; |
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| 295 | GetNormalizationConstant( availableEnergy, n, anpn ); |
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| 296 | G4double ran = G4UniformRand(); |
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| 297 | G4double dum, excs = 0.0; |
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| 298 | if( targetParticle.GetDefinition() == aProton ) |
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| 299 | { |
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| 300 | G4int counter = -1; |
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| 301 | for( np=0; np<numSec/3 && ran>=excs; ++np ) |
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| 302 | { |
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| 303 | for( nm=std::max(0,np-2); nm<=(np+1) && ran>=excs; ++nm ) |
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| 304 | { |
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| 305 | for( nz=0; nz<numSec/3 && ran>=excs; ++nz ) |
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| 306 | { |
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| 307 | if( ++counter < numMul ) |
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| 308 | { |
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| 309 | nt = np+nm+nz; |
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| 310 | if( nt>0 && nt<=numSec ) |
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| 311 | { |
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| 312 | test = std::exp( std::min( expxu, std::max( expxl, -(pi/4.0)*(nt*nt)/(n*n) ) ) ); |
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| 313 | dum = (pi/anpn)*nt*protmul[counter]*protnorm[nt-1]/(2.0*n*n); |
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| 314 | if( std::fabs(dum) < 1.0 ) |
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| 315 | { |
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| 316 | if( test >= 1.0e-10 )excs += dum*test; |
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| 317 | } |
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| 318 | else |
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| 319 | excs += dum*test; |
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| 320 | } |
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| 321 | } |
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| 322 | } |
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| 323 | } |
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| 324 | } |
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| 325 | if( ran >= excs ) // 3 previous loops continued to the end |
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| 326 | { |
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| 327 | quasiElastic = true; |
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| 328 | return; |
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| 329 | } |
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| 330 | np--; nm--; nz--; |
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| 331 | G4int ncht = std::min( 4, std::max( 1, np-nm+2 ) ); |
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| 332 | switch( ncht ) |
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| 333 | { |
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| 334 | case 1: |
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| 335 | currentParticle.SetDefinitionAndUpdateE( anAntiSigmaMinus ); |
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| 336 | incidentHasChanged = true; |
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| 337 | break; |
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| 338 | case 2: |
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| 339 | if( G4UniformRand() < 0.5 ) |
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| 340 | { |
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| 341 | if( G4UniformRand() < 0.5 ) |
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| 342 | { |
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| 343 | currentParticle.SetDefinitionAndUpdateE( anAntiSigmaZero ); |
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| 344 | incidentHasChanged = true; |
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| 345 | } |
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| 346 | else |
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| 347 | { |
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| 348 | currentParticle.SetDefinitionAndUpdateE( anAntiSigmaMinus ); |
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| 349 | incidentHasChanged = true; |
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| 350 | targetParticle.SetDefinitionAndUpdateE( aNeutron ); |
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| 351 | targetHasChanged = true; |
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| 352 | } |
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| 353 | } |
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| 354 | else |
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| 355 | { |
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| 356 | if( G4UniformRand() >= 0.5 ) |
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| 357 | { |
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| 358 | currentParticle.SetDefinitionAndUpdateE( anAntiSigmaMinus ); |
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| 359 | incidentHasChanged = true; |
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| 360 | targetParticle.SetDefinitionAndUpdateE( aNeutron ); |
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| 361 | targetHasChanged = true; |
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| 362 | } |
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| 363 | } |
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| 364 | break; |
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| 365 | case 3: |
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| 366 | if( G4UniformRand() < 0.5 ) |
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| 367 | { |
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| 368 | if( G4UniformRand() < 0.5 ) |
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| 369 | { |
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| 370 | currentParticle.SetDefinitionAndUpdateE( anAntiSigmaZero ); |
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| 371 | incidentHasChanged = true; |
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| 372 | targetParticle.SetDefinitionAndUpdateE( aNeutron ); |
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| 373 | targetHasChanged = true; |
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| 374 | } |
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| 375 | else |
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| 376 | { |
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| 377 | currentParticle.SetDefinitionAndUpdateE( anAntiSigmaPlus ); |
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| 378 | incidentHasChanged = true; |
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| 379 | } |
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| 380 | } |
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| 381 | else |
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| 382 | { |
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| 383 | if( G4UniformRand() < 0.5 ) |
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| 384 | { |
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| 385 | targetParticle.SetDefinitionAndUpdateE( aNeutron ); |
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| 386 | targetHasChanged = true; |
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| 387 | } |
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| 388 | else |
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| 389 | { |
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| 390 | currentParticle.SetDefinitionAndUpdateE( anAntiSigmaPlus ); |
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| 391 | incidentHasChanged = true; |
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| 392 | } |
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| 393 | } |
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| 394 | break; |
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| 395 | case 4: |
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| 396 | currentParticle.SetDefinitionAndUpdateE( anAntiSigmaPlus ); |
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| 397 | incidentHasChanged = true; |
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| 398 | targetParticle.SetDefinitionAndUpdateE( aNeutron ); |
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| 399 | targetHasChanged = true; |
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| 400 | break; |
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| 401 | } |
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| 402 | } |
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| 403 | else // target must be a neutron |
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| 404 | { |
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| 405 | G4int counter = -1; |
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| 406 | for( np=0; np<numSec/3 && ran>=excs; ++np ) |
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| 407 | { |
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| 408 | for( nm=std::max(0,np-1); nm<=(np+2) && ran>=excs; ++nm ) |
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| 409 | { |
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| 410 | for( nz=0; nz<numSec/3 && ran>=excs; ++nz ) |
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| 411 | { |
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| 412 | if( ++counter < numMul ) |
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| 413 | { |
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| 414 | nt = np+nm+nz; |
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| 415 | if( nt>0 && nt<=numSec ) |
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| 416 | { |
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| 417 | test = std::exp( std::min( expxu, std::max( expxl, -(pi/4.0)*(nt*nt)/(n*n) ) ) ); |
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| 418 | dum = (pi/anpn)*nt*neutmul[counter]*neutnorm[nt-1]/(2.0*n*n); |
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| 419 | if( std::fabs(dum) < 1.0 ) |
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| 420 | { |
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| 421 | if( test >= 1.0e-10 )excs += dum*test; |
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| 422 | } |
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| 423 | else |
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| 424 | excs += dum*test; |
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| 425 | } |
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| 426 | } |
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| 427 | } |
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| 428 | } |
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| 429 | } |
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| 430 | if( ran >= excs ) // 3 previous loops continued to the end |
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| 431 | { |
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| 432 | quasiElastic = true; |
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| 433 | return; |
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| 434 | } |
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| 435 | np--; nm--; nz--; |
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| 436 | G4int ncht = std::min( 4, std::max( 1, np-nm+3 ) ); |
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| 437 | switch( ncht ) |
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| 438 | { |
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| 439 | case 1: |
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| 440 | currentParticle.SetDefinitionAndUpdateE( anAntiSigmaMinus ); |
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| 441 | incidentHasChanged = true; |
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| 442 | targetParticle.SetDefinitionAndUpdateE( aProton ); |
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| 443 | targetHasChanged = true; |
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| 444 | break; |
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| 445 | case 2: |
---|
| 446 | if( G4UniformRand() < 0.5 ) |
---|
| 447 | { |
---|
| 448 | if( G4UniformRand() < 0.5 ) |
---|
| 449 | { |
---|
| 450 | currentParticle.SetDefinitionAndUpdateE( anAntiSigmaZero ); |
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| 451 | incidentHasChanged = true; |
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| 452 | targetParticle.SetDefinitionAndUpdateE( aProton ); |
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| 453 | targetHasChanged = true; |
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| 454 | } |
---|
| 455 | else |
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| 456 | { |
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| 457 | currentParticle.SetDefinitionAndUpdateE( anAntiSigmaMinus ); |
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| 458 | incidentHasChanged = true; |
---|
| 459 | } |
---|
| 460 | } |
---|
| 461 | else |
---|
| 462 | { |
---|
| 463 | if( G4UniformRand() < 0.5 ) |
---|
| 464 | { |
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| 465 | targetParticle.SetDefinitionAndUpdateE( aProton ); |
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| 466 | targetHasChanged = true; |
---|
| 467 | } |
---|
| 468 | else |
---|
| 469 | { |
---|
| 470 | currentParticle.SetDefinitionAndUpdateE( anAntiSigmaMinus ); |
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| 471 | incidentHasChanged = true; |
---|
| 472 | } |
---|
| 473 | } |
---|
| 474 | break; |
---|
| 475 | case 3: |
---|
| 476 | if( G4UniformRand() < 0.5 ) |
---|
| 477 | { |
---|
| 478 | if( G4UniformRand() < 0.5 ) |
---|
| 479 | { |
---|
| 480 | currentParticle.SetDefinitionAndUpdateE( anAntiSigmaZero ); |
---|
| 481 | incidentHasChanged = true; |
---|
| 482 | } |
---|
| 483 | else |
---|
| 484 | { |
---|
| 485 | currentParticle.SetDefinitionAndUpdateE( anAntiSigmaPlus ); |
---|
| 486 | incidentHasChanged = true; |
---|
| 487 | targetParticle.SetDefinitionAndUpdateE( aProton ); |
---|
| 488 | targetHasChanged = true; |
---|
| 489 | } |
---|
| 490 | } |
---|
| 491 | else |
---|
| 492 | { |
---|
| 493 | if( G4UniformRand() >= 0.5 ) |
---|
| 494 | { |
---|
| 495 | currentParticle.SetDefinitionAndUpdateE( anAntiSigmaPlus ); |
---|
| 496 | incidentHasChanged = true; |
---|
| 497 | targetParticle.SetDefinitionAndUpdateE( aProton ); |
---|
| 498 | targetHasChanged = true; |
---|
| 499 | } |
---|
| 500 | } |
---|
| 501 | break; |
---|
| 502 | default: |
---|
| 503 | currentParticle.SetDefinitionAndUpdateE( anAntiSigmaPlus ); |
---|
| 504 | incidentHasChanged = true; |
---|
| 505 | break; |
---|
| 506 | } |
---|
| 507 | } |
---|
| 508 | } |
---|
| 509 | else // random number <= anhl[iplab] |
---|
| 510 | { |
---|
| 511 | if( centerofmassEnergy <= aPiPlus->GetPDGMass()/MeV+aKaonPlus->GetPDGMass()/MeV ) |
---|
| 512 | { |
---|
| 513 | quasiElastic = true; |
---|
| 514 | return; |
---|
| 515 | } |
---|
| 516 | // |
---|
| 517 | // annihilation channels |
---|
| 518 | // |
---|
| 519 | G4double n, anpn; |
---|
| 520 | GetNormalizationConstant( -centerofmassEnergy, n, anpn ); |
---|
| 521 | G4double ran = G4UniformRand(); |
---|
| 522 | G4double dum, excs = 0.0; |
---|
| 523 | if( targetParticle.GetDefinition() == aProton ) |
---|
| 524 | { |
---|
| 525 | G4int counter = -1; |
---|
| 526 | for( np=1; np<numSec/3 && ran>=excs; ++np ) |
---|
| 527 | { |
---|
| 528 | nm = np-1; |
---|
| 529 | for( nz=0; nz<numSec/3 && ran>=excs; ++nz ) |
---|
| 530 | { |
---|
| 531 | if( ++counter < numMulA ) |
---|
| 532 | { |
---|
| 533 | nt = np+nm+nz; |
---|
| 534 | if( nt>1 && nt<=numSec ) |
---|
| 535 | { |
---|
| 536 | test = std::exp( std::min( expxu, std::max( expxl, -(pi/4.0)*(nt*nt)/(n*n) ) ) ); |
---|
| 537 | dum = (pi/anpn)*nt*protmulA[counter]*protnormA[nt-1]/(2.0*n*n); |
---|
| 538 | if( std::fabs(dum) < 1.0 ) |
---|
| 539 | { |
---|
| 540 | if( test >= 1.0e-10 )excs += dum*test; |
---|
| 541 | } |
---|
| 542 | else |
---|
| 543 | excs += dum*test; |
---|
| 544 | } |
---|
| 545 | } |
---|
| 546 | } |
---|
| 547 | } |
---|
| 548 | } |
---|
| 549 | else // target must be a neutron |
---|
| 550 | { |
---|
| 551 | G4int counter = -1; |
---|
| 552 | for( np=0; np<numSec/3 && ran>=excs; ++np ) |
---|
| 553 | { |
---|
| 554 | nm = np; |
---|
| 555 | for( nz=0; nz<numSec/3 && ran>=excs; ++nz ) |
---|
| 556 | { |
---|
| 557 | if( ++counter < numMulA ) |
---|
| 558 | { |
---|
| 559 | nt = np+nm+nz; |
---|
| 560 | if( nt>1 && nt<=numSec ) |
---|
| 561 | { |
---|
| 562 | test = std::exp( std::min( expxu, std::max( expxl, -(pi/4.0)*(nt*nt)/(n*n) ) ) ); |
---|
| 563 | dum = (pi/anpn)*nt*neutmulA[counter]*neutnormA[nt-1]/(2.0*n*n); |
---|
| 564 | if( std::fabs(dum) < 1.0 ) |
---|
| 565 | { |
---|
| 566 | if( test >= 1.0e-10 )excs += dum*test; |
---|
| 567 | } |
---|
| 568 | else |
---|
| 569 | excs += dum*test; |
---|
| 570 | } |
---|
| 571 | } |
---|
| 572 | } |
---|
| 573 | } |
---|
| 574 | } |
---|
| 575 | if( ran >= excs ) // 3 previous loops continued to the end |
---|
| 576 | { |
---|
| 577 | quasiElastic = true; |
---|
| 578 | return; |
---|
| 579 | } |
---|
| 580 | np--; nz--; |
---|
| 581 | currentParticle.SetMass( 0.0 ); |
---|
| 582 | targetParticle.SetMass( 0.0 ); |
---|
| 583 | } |
---|
| 584 | SetUpPions( np, nm, nz, vec, vecLen ); |
---|
| 585 | if( currentParticle.GetMass() == 0.0 ) |
---|
| 586 | { |
---|
| 587 | if( nz == 0 ) |
---|
| 588 | { |
---|
| 589 | if( nm > 0 ) |
---|
| 590 | { |
---|
| 591 | for( G4int i=0; i<vecLen; ++i ) |
---|
| 592 | { |
---|
| 593 | if( vec[i]->GetDefinition() == aPiMinus ) |
---|
| 594 | { |
---|
| 595 | vec[i]->SetDefinitionAndUpdateE( aKaonMinus ); |
---|
| 596 | break; |
---|
| 597 | } |
---|
| 598 | } |
---|
| 599 | } |
---|
| 600 | } |
---|
| 601 | else // nz > 0 |
---|
| 602 | { |
---|
| 603 | if( nm == 0 ) |
---|
| 604 | { |
---|
| 605 | for( G4int i=0; i<vecLen; ++i ) |
---|
| 606 | { |
---|
| 607 | if( vec[i]->GetDefinition() == aPiZero ) |
---|
| 608 | { |
---|
| 609 | vec[i]->SetDefinitionAndUpdateE( aKaonZL ); |
---|
| 610 | break; |
---|
| 611 | } |
---|
| 612 | } |
---|
| 613 | } |
---|
| 614 | else // nm > 0 |
---|
| 615 | { |
---|
| 616 | if( G4UniformRand() < 0.5 ) |
---|
| 617 | { |
---|
| 618 | if( nm > 0 ) |
---|
| 619 | { |
---|
| 620 | for( G4int i=0; i<vecLen; ++i ) |
---|
| 621 | { |
---|
| 622 | if( vec[i]->GetDefinition() == aPiMinus ) |
---|
| 623 | { |
---|
| 624 | vec[i]->SetDefinitionAndUpdateE( aKaonMinus ); |
---|
| 625 | break; |
---|
| 626 | } |
---|
| 627 | } |
---|
| 628 | } |
---|
| 629 | } |
---|
| 630 | else // random number >= 0.5 |
---|
| 631 | { |
---|
| 632 | for( G4int i=0; i<vecLen; ++i ) |
---|
| 633 | { |
---|
| 634 | if( vec[i]->GetDefinition() == aPiZero ) |
---|
| 635 | { |
---|
| 636 | vec[i]->SetDefinitionAndUpdateE( aKaonZL ); |
---|
| 637 | break; |
---|
| 638 | } |
---|
| 639 | } |
---|
| 640 | } |
---|
| 641 | } |
---|
| 642 | } |
---|
| 643 | } |
---|
| 644 | return; |
---|
| 645 | } |
---|
| 646 | |
---|
| 647 | /* end of file */ |
---|
| 648 | |
---|