| [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 | // $Id: G4RPGAntiOmegaMinusInelastic.cc,v 1.1 2007/07/18 21:04:20 dennis Exp $
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| [1340] | 27 | // GEANT4 tag $Name: geant4-09-03-ref-09 $
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| [819] | 28 | //
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| 29 | //
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| 30 | // NOTE: The FORTRAN version of the cascade, CASAOM, simply called the
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| 31 | // routine for the OmegaMinus particle. Hence, the Cascade function
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| 32 | // below is just a copy of the Cascade from the OmegaMinus particle.
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| 33 |
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| 34 | #include "G4RPGAntiOmegaMinusInelastic.hh"
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| 35 | #include "Randomize.hh"
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| 36 |
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| 37 | G4HadFinalState*
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| 38 | G4RPGAntiOmegaMinusInelastic::ApplyYourself( const G4HadProjectile &aTrack,
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| 39 | G4Nucleus &targetNucleus )
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| 40 | {
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| 41 | const G4HadProjectile *originalIncident = &aTrack;
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| 42 | if (originalIncident->GetKineticEnergy()<= 0.1*MeV)
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| 43 | {
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| 44 | theParticleChange.SetStatusChange(isAlive);
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| 45 | theParticleChange.SetEnergyChange(aTrack.GetKineticEnergy());
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| 46 | theParticleChange.SetMomentumChange(aTrack.Get4Momentum().vect().unit());
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| 47 | return &theParticleChange;
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| 48 | }
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| 49 |
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| 50 | // create the target particle
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| 51 |
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| 52 | G4DynamicParticle *originalTarget = targetNucleus.ReturnTargetParticle();
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| 53 |
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| 54 | if( verboseLevel > 1 )
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| 55 | {
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| 56 | const G4Material *targetMaterial = aTrack.GetMaterial();
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| 57 | G4cout << "kinetic energy = " << originalIncident->GetKineticEnergy()/MeV << "MeV, ";
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| 58 | G4cout << "target material = " << targetMaterial->GetName() << ", ";
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| 59 | G4cout << "target particle = " << originalTarget->GetDefinition()->GetParticleName()
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| 60 | << G4endl;
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| 61 | }
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| 62 | //
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| 63 | // Fermi motion and evaporation
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| 64 | // As of Geant3, the Fermi energy calculation had not been Done
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| 65 | //
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| 66 | G4double ek = originalIncident->GetKineticEnergy()/MeV;
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| 67 | G4double amas = originalIncident->GetDefinition()->GetPDGMass()/MeV;
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| 68 | G4ReactionProduct modifiedOriginal;
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| 69 | modifiedOriginal = *originalIncident;
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| 70 |
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| 71 | G4double tkin = targetNucleus.Cinema( ek );
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| 72 | ek += tkin;
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| 73 | modifiedOriginal.SetKineticEnergy( ek*MeV );
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| 74 | G4double et = ek + amas;
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| 75 | G4double p = std::sqrt( std::abs((et-amas)*(et+amas)) );
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| 76 | G4double pp = modifiedOriginal.GetMomentum().mag()/MeV;
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| 77 | if( pp > 0.0 )
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| 78 | {
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| 79 | G4ThreeVector momentum = modifiedOriginal.GetMomentum();
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| 80 | modifiedOriginal.SetMomentum( momentum * (p/pp) );
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| 81 | }
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| 82 | //
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| 83 | // calculate black track energies
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| 84 | //
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| 85 | tkin = targetNucleus.EvaporationEffects( ek );
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| 86 | ek -= tkin;
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| 87 | modifiedOriginal.SetKineticEnergy( ek*MeV );
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| 88 | et = ek + amas;
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| 89 | p = std::sqrt( std::abs((et-amas)*(et+amas)) );
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| 90 | pp = modifiedOriginal.GetMomentum().mag()/MeV;
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| 91 | if( pp > 0.0 )
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| 92 | {
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| 93 | G4ThreeVector momentum = modifiedOriginal.GetMomentum();
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| 94 | modifiedOriginal.SetMomentum( momentum * (p/pp) );
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| 95 | }
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| 96 | G4ReactionProduct currentParticle = modifiedOriginal;
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| 97 | G4ReactionProduct targetParticle;
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| 98 | targetParticle = *originalTarget;
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| 99 | currentParticle.SetSide( 1 ); // incident always goes in forward hemisphere
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| 100 | targetParticle.SetSide( -1 ); // target always goes in backward hemisphere
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| 101 | G4bool incidentHasChanged = false;
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| 102 | G4bool targetHasChanged = false;
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| 103 | G4bool quasiElastic = false;
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| 104 | G4FastVector<G4ReactionProduct,GHADLISTSIZE> vec; // vec will contain the secondary particles
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| 105 | G4int vecLen = 0;
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| 106 | vec.Initialize( 0 );
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| 107 |
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| 108 | const G4double cutOff = 0.1;
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| 109 | const G4double anni = std::min( 1.3*currentParticle.GetTotalMomentum()/GeV, 0.4 );
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| 110 |
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| 111 | if( (currentParticle.GetKineticEnergy()/MeV > cutOff) || (G4UniformRand() > anni) )
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| 112 | Cascade( vec, vecLen,
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| 113 | originalIncident, currentParticle, targetParticle,
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| 114 | incidentHasChanged, targetHasChanged, quasiElastic );
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| 115 |
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| 116 | CalculateMomenta( vec, vecLen,
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| 117 | originalIncident, originalTarget, modifiedOriginal,
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| 118 | targetNucleus, currentParticle, targetParticle,
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| 119 | incidentHasChanged, targetHasChanged, quasiElastic );
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| 120 |
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| 121 | SetUpChange( vec, vecLen,
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| 122 | currentParticle, targetParticle,
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| 123 | incidentHasChanged );
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| 124 |
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| 125 | delete originalTarget;
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| 126 | return &theParticleChange;
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| 127 | }
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| 128 |
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| 129 |
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| 130 | void G4RPGAntiOmegaMinusInelastic::Cascade(
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| 131 | G4FastVector<G4ReactionProduct,GHADLISTSIZE> &vec,
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| 132 | G4int& vecLen,
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| 133 | const G4HadProjectile *originalIncident,
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| 134 | G4ReactionProduct ¤tParticle,
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| 135 | G4ReactionProduct &targetParticle,
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| 136 | G4bool &incidentHasChanged,
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| 137 | G4bool &targetHasChanged,
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| 138 | G4bool &quasiElastic )
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| 139 | {
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| 140 | // Derived from H. Fesefeldt's original FORTRAN code CASOM
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| 141 | // AntiOmegaMinus undergoes interaction with nucleon within a nucleus. Check if it is
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| 142 | // energetically possible to produce pions/kaons. In not, assume nuclear excitation
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| 143 | // occurs and input particle is degraded in energy. No other particles are produced.
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| 144 | // If reaction is possible, find the correct number of pions/protons/neutrons
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| 145 | // produced using an interpolation to multiplicity data. Replace some pions or
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| 146 | // protons/neutrons by kaons or strange baryons according to the average
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| 147 | // multiplicity per Inelastic reaction.
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| 148 |
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| 149 | const G4double mOriginal = originalIncident->GetDefinition()->GetPDGMass()/MeV;
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| 150 | const G4double etOriginal = originalIncident->GetTotalEnergy()/MeV;
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| 151 | // const G4double pOriginal = originalIncident->GetTotalMomentum()/MeV;
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| 152 | const G4double targetMass = targetParticle.GetMass()/MeV;
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| 153 | G4double centerofmassEnergy = std::sqrt( mOriginal*mOriginal +
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| 154 | targetMass*targetMass +
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| 155 | 2.0*targetMass*etOriginal );
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| 156 | G4double availableEnergy = centerofmassEnergy-(targetMass+mOriginal);
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| 157 | if( availableEnergy <= G4PionPlus::PionPlus()->GetPDGMass()/MeV )
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| 158 | { // not energetically possible to produce pion(s)
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| 159 | quasiElastic = true;
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| 160 | return;
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| 161 | }
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| 162 | static G4bool first = true;
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| 163 | const G4int numMul = 1200;
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| 164 | const G4int numSec = 60;
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| 165 | static G4double protmul[numMul], protnorm[numSec]; // proton constants
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| 166 | static G4double neutmul[numMul], neutnorm[numSec]; // neutron constants
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| 167 | // np = number of pi+, nm = number of pi-, nz = number of pi0
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| 168 | G4int counter, nt=0, np=0, nm=0, nz=0;
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| 169 | G4double test;
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| 170 | const G4double c = 1.25;
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| 171 | const G4double b[] = { 0.7, 0.7 };
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| 172 | if( first ) // compute normalization constants, this will only be Done once
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| 173 | {
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| 174 | first = false;
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| 175 | G4int i;
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| 176 | for( i=0; i<numMul; ++i )protmul[i] = 0.0;
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| 177 | for( i=0; i<numSec; ++i )protnorm[i] = 0.0;
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| 178 | counter = -1;
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| 179 | for( np=0; np<(numSec/3); ++np )
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| 180 | {
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| 181 | for( nm=std::max(0,np-1); nm<=(np+1); ++nm )
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| 182 | {
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| 183 | for( nz=0; nz<numSec/3; ++nz )
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| 184 | {
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| 185 | if( ++counter < numMul )
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| 186 | {
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| 187 | nt = np+nm+nz;
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| 188 | if( nt>0 && nt<=numSec )
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| 189 | {
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| 190 | protmul[counter] = Pmltpc(np,nm,nz,nt,b[0],c);
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| 191 | protnorm[nt-1] += protmul[counter];
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| 192 | }
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| 193 | }
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| 194 | }
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| 195 | }
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| 196 | }
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| 197 | for( i=0; i<numMul; ++i )neutmul[i] = 0.0;
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| 198 | for( i=0; i<numSec; ++i )neutnorm[i] = 0.0;
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| 199 | counter = -1;
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| 200 | for( np=0; np<numSec/3; ++np )
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| 201 | {
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| 202 | for( nm=np; nm<=(np+2); ++nm )
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| 203 | {
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| 204 | for( nz=0; nz<numSec/3; ++nz )
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| 205 | {
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| 206 | if( ++counter < numMul )
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| 207 | {
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| 208 | nt = np+nm+nz;
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| 209 | if( nt>0 && nt<=numSec )
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| 210 | {
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| 211 | neutmul[counter] = Pmltpc(np,nm,nz,nt,b[1],c);
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| 212 | neutnorm[nt-1] += neutmul[counter];
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| 213 | }
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| 214 | }
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| 215 | }
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| 216 | }
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| 217 | }
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| 218 | for( i=0; i<numSec; ++i )
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| 219 | {
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| 220 | if( protnorm[i] > 0.0 )protnorm[i] = 1.0/protnorm[i];
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| 221 | if( neutnorm[i] > 0.0 )neutnorm[i] = 1.0/neutnorm[i];
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| 222 | }
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| 223 | } // end of initialization
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| 224 |
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| 225 | const G4double expxu = 82.; // upper bound for arg. of exp
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| 226 | const G4double expxl = -expxu; // lower bound for arg. of exp
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| 227 | G4ParticleDefinition *aNeutron = G4Neutron::Neutron();
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| 228 | G4ParticleDefinition *aProton = G4Proton::Proton();
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| 229 | G4ParticleDefinition *aKaonMinus = G4KaonMinus::KaonMinus();
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| 230 | G4ParticleDefinition *aSigmaPlus = G4SigmaPlus::SigmaPlus();
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| 231 | G4ParticleDefinition *aXiZero = G4XiZero::XiZero();
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| 232 | G4double n, anpn;
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| 233 | GetNormalizationConstant( availableEnergy, n, anpn );
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| 234 | G4double ran = G4UniformRand();
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| 235 | G4double dum, excs = 0.0;
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| 236 | G4int nvefix = 0;
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| 237 | if( targetParticle.GetDefinition() == aProton )
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| 238 | {
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| 239 | counter = -1;
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| 240 | for( np=0; np<numSec/3 && ran>=excs; ++np )
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| 241 | {
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| 242 | for( nm=std::max(0,np-1); nm<=(np+1) && ran>=excs; ++nm )
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| 243 | {
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| 244 | for( nz=0; nz<numSec/3 && ran>=excs; ++nz )
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| 245 | {
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| 246 | if( ++counter < numMul )
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| 247 | {
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| 248 | nt = np+nm+nz;
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| 249 | if( nt>0 && nt<=numSec )
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| 250 | {
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| 251 | test = std::exp( std::min( expxu, std::max( expxl, -(pi/4.0)*(nt*nt)/(n*n) ) ) );
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| 252 | dum = (pi/anpn)*nt*protmul[counter]*protnorm[nt-1]/(2.0*n*n);
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| 253 | if( std::fabs(dum) < 1.0 )
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| 254 | {
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| 255 | if( test >= 1.0e-10 )excs += dum*test;
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| 256 | }
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| 257 | else
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| 258 | excs += dum*test;
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| 259 | }
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| 260 | }
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| 261 | }
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| 262 | }
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| 263 | }
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| 264 | if( ran >= excs ) // 3 previous loops continued to the end
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| 265 | {
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| 266 | quasiElastic = true;
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| 267 | return;
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| 268 | }
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| 269 | np--; nm--; nz--;
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| 270 | //
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| 271 | // number of secondary mesons determined by kno distribution
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| 272 | // check for total charge of final state mesons to determine
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| 273 | // the kind of baryons to be produced, taking into account
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| 274 | // charge and strangeness conservation
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| 275 | //
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| 276 | if( np < nm )
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| 277 | {
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| 278 | if( np+1 == nm )
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| 279 | {
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| 280 | currentParticle.SetDefinitionAndUpdateE( aXiZero );
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| 281 | incidentHasChanged = true;
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| 282 | nvefix = 1;
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| 283 | }
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| 284 | else // charge mismatch
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| 285 | {
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| 286 | currentParticle.SetDefinitionAndUpdateE( aSigmaPlus );
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| 287 | incidentHasChanged = true;
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| 288 | nvefix = 2;
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| 289 | }
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| 290 | }
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| 291 | else if( np > nm )
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| 292 | {
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| 293 | targetParticle.SetDefinitionAndUpdateE( aNeutron );
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| 294 | targetHasChanged = true;
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| 295 | }
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| 296 | }
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| 297 | else // target must be a neutron
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| 298 | {
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| 299 | counter = -1;
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| 300 | for( np=0; np<numSec/3 && ran>=excs; ++np )
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| 301 | {
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| 302 | for( nm=np; nm<=(np+2) && ran>=excs; ++nm )
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| 303 | {
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| 304 | for( nz=0; nz<numSec/3 && ran>=excs; ++nz )
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| 305 | {
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| 306 | if( ++counter < numMul )
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| 307 | {
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| 308 | nt = np+nm+nz;
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| 309 | if( nt>0 && nt<=numSec )
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| 310 | {
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| 311 | test = std::exp( std::min( expxu, std::max( expxl, -(pi/4.0)*(nt*nt)/(n*n) ) ) );
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| 312 | dum = (pi/anpn)*nt*neutmul[counter]*neutnorm[nt-1]/(2.0*n*n);
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| 313 | if( std::fabs(dum) < 1.0 )
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| 314 | {
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| 315 | if( test >= 1.0e-10 )excs += dum*test;
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| 316 | }
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| 317 | else
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| 318 | excs += dum*test;
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| 319 | }
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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 | if( ran >= excs ) // 3 previous loops continued to the end
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| 325 | {
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| 326 | quasiElastic = true;
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| 327 | return;
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| 328 | }
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| 329 | np--; nm--; nz--;
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| 330 | if( np+1 < nm )
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| 331 | {
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| 332 | if( np+2 == nm )
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| 333 | {
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| 334 | currentParticle.SetDefinitionAndUpdateE( aXiZero );
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| 335 | incidentHasChanged = true;
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| 336 | nvefix = 1;
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| 337 | }
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| 338 | else // charge mismatch
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| 339 | {
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| 340 | currentParticle.SetDefinitionAndUpdateE( aSigmaPlus );
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| 341 | incidentHasChanged = true;
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| 342 | nvefix = 2;
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| 343 | }
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| 344 | targetParticle.SetDefinitionAndUpdateE( aProton );
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| 345 | targetHasChanged = true;
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| 346 | }
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| 347 | else if( np+1 == nm )
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| 348 | {
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| 349 | targetParticle.SetDefinitionAndUpdateE( aProton );
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| 350 | targetHasChanged = true;
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| 351 | }
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| 352 | }
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| 353 | SetUpPions( np, nm, nz, vec, vecLen );
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| 354 | for( G4int i=0; i<vecLen && nvefix>0; ++i )
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| 355 | {
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| 356 | if( vec[i]->GetDefinition() == G4PionMinus::PionMinus() )
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| 357 | {
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| 358 | //
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| 359 | // correct the strangeness by replacing a pi- by a kaon-
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| 360 | //
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| 361 | if( nvefix >= 1 )vec[i]->SetDefinitionAndUpdateE( aKaonMinus );
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| 362 | --nvefix;
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| 363 | }
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| 364 | }
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| 365 | return;
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| 366 | }
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| 367 |
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| 368 | /* end of file */
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| 369 |
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