Gabriele Cosmo
108 lines
4.2 KiB
C++
108 lines
4.2 KiB
C++
//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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// INCL++ intra-nuclear cascade model
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// Pekka Kaitaniemi, CEA and Helsinki Institute of Physics
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// Davide Mancusi, CEA
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// Alain Boudard, CEA
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// Sylvie Leray, CEA
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// Joseph Cugnon, University of Liege
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//
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// INCL++ revision: v5.1.8
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//
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#define INCLXX_IN_GEANT4_MODE 1
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#include "globals.hh"
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#include "G4INCLPionNucleonChannel.hh"
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#include "G4INCLKinematicsUtils.hh"
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#include "G4INCLBinaryCollisionAvatar.hh"
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#include "G4INCLRandom.hh"
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#include "G4INCLGlobals.hh"
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#include "G4INCLLogger.hh"
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namespace G4INCL {
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PionNucleonChannel::PionNucleonChannel(Particle *p1, Particle *p2, Nucleus *nucleus, const G4bool localE)
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: theNucleus(nucleus), particle1(p1), particle2(p2), locE(localE)
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{
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}
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PionNucleonChannel::~PionNucleonChannel(){
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}
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FinalState* PionNucleonChannel::getFinalState() {
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FinalState *fs = new FinalState;
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Particle * nucleon;
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Particle * pion;
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if(particle1->isNucleon()) {
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nucleon = particle1;
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pion = particle2;
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} else {
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nucleon = particle2;
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pion = particle1;
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}
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ParticleType deltaType = DeltaZero;
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if(ParticleConfig::isPair(particle1, particle2, Proton, PiPlus)) {
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deltaType = DeltaPlusPlus;
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} else if(ParticleConfig::isPair(particle1, particle2, Neutron, PiPlus)) {
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deltaType = DeltaPlus;
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} else if(ParticleConfig::isPair(particle1, particle2, Proton, PiZero)) {
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deltaType = DeltaPlus;
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} else if(ParticleConfig::isPair(particle1, particle2, Neutron, PiZero)) {
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deltaType = DeltaZero;
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} else if(ParticleConfig::isPair(particle1, particle2, Proton, PiMinus)) {
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deltaType = DeltaZero;
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} else if(ParticleConfig::isPair(particle1, particle2, Neutron, PiMinus)) {
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deltaType = DeltaMinus;
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} else {
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ERROR("Unknown particle pair in Pi-N collision." << std::endl);
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}
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G4double deltaEnergy = nucleon->getEnergy() - nucleon->getPotentialEnergy()
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+ pion->getEnergy() - pion->getPotentialEnergy();
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nucleon->setType(deltaType); // nucleon becomes the delta
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deltaEnergy += theNucleus->getPotential()->computePotentialEnergy(nucleon);
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nucleon->setEnergy(deltaEnergy); // set the energy of the delta
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ThreeVector deltaMomentum = nucleon->getMomentum() + pion->getMomentum();
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nucleon->setMomentum(deltaMomentum);
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const G4double deltaMass = std::sqrt(deltaEnergy*deltaEnergy - deltaMomentum.mag2());
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nucleon->setMass(deltaMass);
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theNucleus->updatePotentialEnergy(nucleon);
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fs->addModifiedParticle(nucleon); // nucleon became a delta
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fs->addDestroyedParticle(pion); // pion was removed
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return fs;
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}
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}
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