90 lines
4.2 KiB
C++
90 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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// 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 "G4INCLReflectionChannel.hh"
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#include "G4INCLFinalState.hh"
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#include "G4INCLRandom.hh"
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#include "G4INCLINuclearPotential.hh"
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#include <cmath>
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namespace G4INCL {
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const G4double ReflectionChannel::sinMinReflectionAngleSquaredOverFour = std::pow(std::sin(2.*Math::pi/200.),2.);
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const G4double ReflectionChannel::positionScalingFactor = 0.99;
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ReflectionChannel::ReflectionChannel(Nucleus *n, Particle *p)
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:theNucleus(n),theParticle(p)
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{
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}
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ReflectionChannel::~ReflectionChannel()
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{
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}
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void ReflectionChannel::fillFinalState(FinalState *fs) {
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fs->setTotalEnergyBeforeInteraction(theParticle->getEnergy() - theParticle->getPotentialEnergy());
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const ThreeVector &oldMomentum = theParticle->getMomentum();
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const ThreeVector thePosition = theParticle->getPosition();
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G4double pspr = thePosition.dot(oldMomentum);
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if(pspr>=0) { // This means that the particle is trying to leave; perform a reflection
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const G4double x2cour = thePosition.mag2();
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const ThreeVector newMomentum = oldMomentum - (thePosition * (2.0 * pspr/x2cour));
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const G4double deltaP2 = (newMomentum-oldMomentum).mag2();
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theParticle->setMomentum(newMomentum);
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const G4double minDeltaP2 = sinMinReflectionAngleSquaredOverFour * newMomentum.mag2();
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if(deltaP2 < minDeltaP2) { // Avoid extremely small reflection angles
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theParticle->setPosition(thePosition * positionScalingFactor);
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INCL_DEBUG("Reflection angle for particle " << theParticle->getID() << " was too tangential: " << '\n'
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<< " " << deltaP2 << "=deltaP2<minDeltaP2=" << minDeltaP2 << '\n'
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<< " Resetting the particle position to ("
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<< thePosition.getX() << ", "
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<< thePosition.getY() << ", "
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<< thePosition.getZ() << ")" << '\n');
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}
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theNucleus->updatePotentialEnergy(theParticle);
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} else { // The particle momentum is already directed towards the inside of the nucleus; do nothing
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// ...but make sure this only happened because of the frozen propagation
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// assert(theParticle->getPosition().dot(theParticle->getPropagationVelocity())>0.);
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}
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theParticle->thawPropagation();
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fs->addModifiedParticle(theParticle);
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}
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}
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