G4INCLNSToNSChannel.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 "G4INCLNSToNSChannel.hh"
#include "G4INCLKinematicsUtils.hh"
#include "G4INCLBinaryCollisionAvatar.hh"
#include "G4INCLRandom.hh"
#include "G4INCLGlobals.hh"
#include "G4INCLLogger.hh"
#include <algorithm>
#include "G4INCLPhaseSpaceGenerator.hh"
 
namespace G4INCL {
    
    NSToNSChannel::NSToNSChannel(Particle *p1, Particle *p2)
        : particle1(p1), particle2(p2)
        {}
    
    NSToNSChannel::~NSToNSChannel(){}
    
    void NSToNSChannel::fillFinalState(FinalState *fs) {
        
        Particle *nucleon;
        Particle *sigma;
        
        if(particle1->isNucleon()){
            nucleon = particle1;
            sigma = particle2;
        }
        else{
            nucleon = particle2;
            sigma = particle1;
        }
        
        const G4double sqrtS = KinematicsUtils::totalEnergyInCM(nucleon, sigma);
        const G4int iso = ParticleTable::getIsospin(nucleon->getType()) + ParticleTable::getIsospin(sigma->getType());
// assert(iso == -1 || iso == 1);
        
        if(sigma->getType() == SigmaZero){
            nucleon->setType(ParticleTable::getNucleonType(-iso));
            sigma->setType(ParticleTable::getSigmaType(2*iso));
        }
        else{
            nucleon->setType(ParticleTable::getNucleonType(iso));
            sigma->setType(SigmaZero);
        }
        
        G4double mn=nucleon->getMass();
        G4double my=sigma->getMass();
        
        G4double ey=(sqrtS*sqrtS+my*my-mn*mn)/(2*sqrtS);
        G4double en=std::sqrt(ey*ey-my*my+mn*mn);
        nucleon->setEnergy(en);
        sigma->setEnergy(ey);
        G4double py=std::sqrt(ey*ey-my*my);
        
        ThreeVector mom_hyperon = Random::normVector(py);
 
        sigma->setMomentum(mom_hyperon);
        nucleon->setMomentum(-mom_hyperon);
        
        sigma->adjustEnergyFromMomentum();
        nucleon->adjustEnergyFromMomentum();
        
        fs->addModifiedParticle(nucleon);
        fs->addModifiedParticle(sigma);
                
    }
}