G4INCLPiNToDeltaChannel.cc

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//
// INCL++ intra-nuclear cascade model
// Alain Boudard, CEA-Saclay, France
// Joseph Cugnon, University of Liege, Belgium
// Jean-Christophe David, CEA-Saclay, France
// Pekka Kaitaniemi, CEA-Saclay, France, and Helsinki Institute of Physics, Finland
// Sylvie Leray, CEA-Saclay, France
// Davide Mancusi, CEA-Saclay, France
//
#define INCLXX_IN_GEANT4_MODE 1
 
#include "globals.hh"
 
#include "G4INCLPiNToDeltaChannel.hh"
#include "G4INCLKinematicsUtils.hh"
#include "G4INCLBinaryCollisionAvatar.hh"
#include "G4INCLRandom.hh"
#include "G4INCLGlobals.hh"
#include "G4INCLLogger.hh"
 
namespace G4INCL {
 
  PiNToDeltaChannel::PiNToDeltaChannel(Particle *p1, Particle *p2)
    : particle1(p1), particle2(p2)
  {
 
  }
 
  PiNToDeltaChannel::~PiNToDeltaChannel(){
 
  }
 
  void PiNToDeltaChannel::fillFinalState(FinalState *fs) {
    Particle * nucleon;
    Particle * pion;
    if(particle1->isNucleon()) {
      nucleon = particle1;
      pion = particle2;
    } else {
      nucleon = particle2;
      pion = particle1;
    }
 
    ParticleType deltaType = DeltaZero;
    if(ParticleConfig::isPair(particle1, particle2, Proton, PiPlus)) {
      deltaType = DeltaPlusPlus;
    } else if(ParticleConfig::isPair(particle1, particle2, Neutron, PiPlus)) {
      deltaType = DeltaPlus;
    } else if(ParticleConfig::isPair(particle1, particle2, Proton, PiZero)) {
      deltaType = DeltaPlus;
    } else if(ParticleConfig::isPair(particle1, particle2, Neutron, PiZero)) {
      deltaType = DeltaZero;
    } else if(ParticleConfig::isPair(particle1, particle2, Proton, PiMinus)) {
      deltaType = DeltaZero;
    } else if(ParticleConfig::isPair(particle1, particle2, Neutron, PiMinus)) {
      deltaType = DeltaMinus;
    } else {
      INCL_ERROR("Unknown particle pair in Pi-N collision." << '\n');
    }
 
    G4double deltaEnergy = nucleon->getEnergy()+ pion->getEnergy();
 
    nucleon->setType(deltaType); // nucleon becomes the delta
    nucleon->setEnergy(deltaEnergy); // set the energy of the delta
 
    // Erase the parent resonance information of the nucleon and pion
    nucleon->setParentResonancePDGCode(0);
    nucleon->setParentResonanceID(0);
    pion->setParentResonancePDGCode(0);
    pion->setParentResonanceID(0);
    
    ThreeVector deltaMomentum = nucleon->getMomentum() + pion->getMomentum();
    nucleon->setMomentum(deltaMomentum);
 
    const G4double deltaMass = std::sqrt(deltaEnergy*deltaEnergy - deltaMomentum.mag2());
    nucleon->setMass(deltaMass);
 
    fs->addModifiedParticle(nucleon); // nucleon became a delta
    fs->addDestroyedParticle(pion);  // pion was removed
  }
 
}