G4INCLNNToNNKKbChannel.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 "G4INCLNNToNNKKbChannel.hh"
#include "G4INCLKinematicsUtils.hh"
#include "G4INCLBinaryCollisionAvatar.hh"
#include "G4INCLRandom.hh"
#include "G4INCLGlobals.hh"
#include "G4INCLLogger.hh"
#include <algorithm>
#include "G4INCLPhaseSpaceGenerator.hh"
 
namespace G4INCL {
    
    const G4double NNToNNKKbChannel::angularSlope = 2.; // What is the exact effect? Sould be check
    
    NNToNNKKbChannel::NNToNNKKbChannel(Particle *p1, Particle *p2)
        : particle1(p1), particle2(p2)
        {}
    
    NNToNNKKbChannel::~NNToNNKKbChannel(){}
    
    void NNToNNKKbChannel::fillFinalState(FinalState *fs) {
        
        // pp -> pp K+ K- (1)
        // pp -> pp K0 K0 (1)
        // pp -> pn K+ K0 (4)
        // pn -> pp K0 K- (4)
        // pn -> pn K+ K- (9)
        
        const G4double sqrtS = KinematicsUtils::totalEnergyInCM(particle1, particle2);
        
        const G4int iso = ParticleTable::getIsospin(particle1->getType()) + ParticleTable::getIsospin(particle2->getType());
        
        ParticleType Kaon1Type;
        ParticleType Kaon2Type;
        G4double rdm = Random::shoot();
        
        if(iso == 2){
            if(rdm*6. < 1.){
                Kaon1Type = KPlus;
                Kaon2Type = KMinus;
            }
            else if(rdm*6. < 2){
                Kaon1Type = KZero;
                Kaon2Type = KZeroBar;
            }
            else{
                Kaon1Type = KPlus;
                Kaon2Type = KZeroBar;
                particle1->setType(Neutron);
            }
        }
        else if(iso == -2){
            if(rdm*6. < 1.){
                Kaon1Type = KPlus;
                Kaon2Type = KMinus;
            }
            else if(rdm*6. < 2){
                Kaon1Type = KZero;
                Kaon2Type = KZeroBar;
            }
            else{
                Kaon1Type = KZero;
                Kaon2Type = KMinus;
                particle1->setType(Proton);
            }
        }
        else if(rdm*26. < 9.){
            Kaon1Type = KPlus;
            Kaon2Type = KMinus;
        }
        else if(rdm*26. < 18.){
            Kaon1Type = KZero;
            Kaon2Type = KZeroBar;
        }
        else if(rdm*26. < 22.){
            Kaon1Type = KZero;
            Kaon2Type = KMinus;
            particle1->setType(Proton);
            particle2->setType(Proton);
        }
        else{
            Kaon1Type = KPlus;
            Kaon2Type = KZeroBar;
            particle1->setType(Neutron);
            particle2->setType(Neutron);
        }
        
        ParticleList list;
        list.push_back(particle1);
        list.push_back(particle2);
        const ThreeVector &rcol1 = particle1->getPosition();
        const ThreeVector &rcol2 = particle2->getPosition();
        const ThreeVector zero;
        Particle *kaon = new Particle(Kaon1Type,zero,rcol1);
        Particle *antikaon = new Particle(Kaon2Type,zero,rcol2);
        list.push_back(kaon);
        list.push_back(antikaon);
        
        if(Random::shoot()<0.5) PhaseSpaceGenerator::generateBiased(sqrtS, list, 0, angularSlope);
        else PhaseSpaceGenerator::generateBiased(sqrtS, list, 1, angularSlope);
        
        fs->addModifiedParticle(particle1);
        fs->addModifiedParticle(particle2);
        fs->addCreatedParticle(kaon);
        fs->addCreatedParticle(antikaon);
        
    }
}