Gabriele Cosmo
128 lines
5.3 KiB
C++
128 lines
5.3 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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// Alain Boudard, CEA-Saclay, France
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// Joseph Cugnon, University of Liege, Belgium
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// Jean-Christophe David, CEA-Saclay, France
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// Pekka Kaitaniemi, CEA-Saclay, France, and Helsinki Institute of Physics, Finland
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// Sylvie Leray, CEA-Saclay, France
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// Davide Mancusi, CEA-Saclay, France
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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 "G4INCLTransmissionChannel.hh"
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namespace G4INCL {
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TransmissionChannel::TransmissionChannel(Nucleus * const nucleus, Particle * const particle)
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: theNucleus(nucleus), theParticle(particle),
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refraction(false),
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pOutMag(0.),
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kineticEnergyOutside(initializeKineticEnergyOutside()),
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cosRefractionAngle(1.)
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{}
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TransmissionChannel::TransmissionChannel(Nucleus * const nucleus, Particle * const particle, const G4double TOut)
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: theNucleus(nucleus), theParticle(particle),
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refraction(false),
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pOutMag(0.),
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kineticEnergyOutside(TOut),
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cosRefractionAngle(1.)
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{}
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TransmissionChannel::TransmissionChannel(Nucleus * const nucleus, Particle * const particle, const G4double kOut, const G4double cosR)
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: theNucleus(nucleus), theParticle(particle),
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refraction(true),
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pOutMag(kOut),
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kineticEnergyOutside(initializeKineticEnergyOutside()),
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cosRefractionAngle(cosR)
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{}
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TransmissionChannel::~TransmissionChannel() {}
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G4double TransmissionChannel::initializeKineticEnergyOutside() {
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// The particle energy outside the nucleus. Subtract the nuclear
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// potential from the kinetic energy when leaving the nucleus
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G4double TOut = theParticle->getEnergy()
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- theParticle->getPotentialEnergy()
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- theParticle->getMass();
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// Correction for real masses
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const G4int AParent = theNucleus->getA();
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const G4int ZParent = theNucleus->getZ();
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const G4int SParent = theNucleus->getS();
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const G4double theQValueCorrection = theParticle->getEmissionQValueCorrection(AParent,ZParent,SParent);
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TOut += theQValueCorrection;
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return TOut;
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}
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void TransmissionChannel::particleLeaves() {
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// Use the table mass in the outside world
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theParticle->setTableMass();
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theParticle->setPotentialEnergy(0.);
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if(refraction) {
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// Change the momentum direction
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// The magnitude of the particle momentum outside the nucleus will be
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// fixed by the kineticEnergyOutside variable. This is done in order to
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// avoid numerical inaccuracies.
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const ThreeVector &position = theParticle->getPosition();
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const G4double r2 = position.mag2();
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ThreeVector normal;
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if(r2>0.)
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normal = position / std::sqrt(r2);
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const ThreeVector &momentum = theParticle->getMomentum();
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const ThreeVector pOut = normal * (pOutMag * cosRefractionAngle) + momentum - normal * normal.dot(momentum);
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// assert(std::fabs(pOut.mag()-pOutMag)<1.e-5);
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theParticle->setMomentum(pOut);
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}
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// Scaling factor for the particle momentum
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theParticle->setEnergy(kineticEnergyOutside + theParticle->getMass());
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theParticle->adjustMomentumFromEnergy();
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}
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void TransmissionChannel::fillFinalState(FinalState *fs) {
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G4double initialEnergy = 0.0;
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initialEnergy = theParticle->getEnergy() - theParticle->getPotentialEnergy();
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// Correction for real masses
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const G4int AParent = theNucleus->getA();
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const G4int ZParent = theNucleus->getZ();
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const G4int SParent = theNucleus->getS();
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initialEnergy += theParticle->getTableMass() - theParticle->getMass()
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+ theParticle->getEmissionQValueCorrection(AParent,ZParent,SParent);
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particleLeaves();
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fs->setTotalEnergyBeforeInteraction(initialEnergy);
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fs->addOutgoingParticle(theParticle); // We write the particle down as outgoing
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}
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}
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