G4INCLNDeltaToNSKChannel.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 "G4INCLNDeltaToNSKChannel.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 NDeltaToNSKChannel::angularSlope = 2.;
    
    NDeltaToNSKChannel::NDeltaToNSKChannel(Particle *p1, Particle *p2)
        : particle1(p1), particle2(p2)
        {}
    
    NDeltaToNSKChannel::~NDeltaToNSKChannel(){}
    
    void NDeltaToNSKChannel::fillFinalState(FinalState *fs) {
        // D++ p -> p S+ K+ (6)
        //
        // D++ n -> p S+ K0 (3)
        // D++ n -> p S0 K+ (3)
        // D++ n -> n S+ K+ (3)
        //
        // D+  p -> p S+ K0 (2)
        // D+  p -> p S0 K+ (2)
        // D+  p -> n S+ K+ (3)
        //
        // D+  n -> p S0 K0 (3)
        // D+  n -> p S- K+ (2)
        // D+  n -> n S+ K0 (2)
        // D+  n -> n S0 K+ (2)
        
        
        Particle *delta;
        
        if (particle1->isResonance()) {
            delta = particle1;
        }
        else {
            delta = particle2;
        }
        
        const G4double sqrtS = KinematicsUtils::totalEnergyInCM(particle1, particle2);
        
        const G4int iso = ParticleTable::getIsospin(particle1->getType()) + ParticleTable::getIsospin(particle2->getType());
        const G4int iso_d = ParticleTable::getIsospin(delta->getType());
        
        ParticleType KaonType;
        ParticleType NucleonType;
        ParticleType SigmaType;
        
        const G4double rdm = Random::shoot();
        
        if(std::abs(iso) == 4){// D++ p
            KaonType = ParticleTable::getKaonType(iso/4);
            NucleonType = ParticleTable::getNucleonType(iso/4);
            SigmaType = ParticleTable::getSigmaType(iso/2);
        }
        else if(iso == 0){// D+  n
            if(rdm*9 < 3){
                KaonType = ParticleTable::getKaonType(-iso_d);
                NucleonType = ParticleTable::getNucleonType(iso_d);
                SigmaType = SigmaZero;
            }
            else if(rdm*9 < 5){
                KaonType = ParticleTable::getKaonType(iso_d);
                NucleonType = ParticleTable::getNucleonType(iso_d);
                SigmaType = ParticleTable::getSigmaType(-2*iso_d);
            }
            else if(rdm*9 < 7){
                KaonType = ParticleTable::getKaonType(-iso_d);
                NucleonType = ParticleTable::getNucleonType(-iso_d);
                SigmaType = ParticleTable::getSigmaType(2*iso_d);
            }
            else{
                KaonType = ParticleTable::getKaonType(iso_d);
                NucleonType = ParticleTable::getNucleonType(-iso_d);
                SigmaType = SigmaZero;
            }
        }
        else if(ParticleTable::getIsospin(particle1->getType()) == ParticleTable::getIsospin(particle2->getType())){// D+  p
            if(rdm*7 < 2){
                KaonType = ParticleTable::getKaonType(-iso/2);
                NucleonType = ParticleTable::getNucleonType(iso/2);
                SigmaType = ParticleTable::getSigmaType(iso);
            }
            else if(rdm*7 < 4){
                KaonType = ParticleTable::getKaonType(iso/2);
                NucleonType = ParticleTable::getNucleonType(iso/2);
                SigmaType = SigmaZero;
            }
            else{
                KaonType = ParticleTable::getKaonType(iso/2);
                NucleonType = ParticleTable::getNucleonType(-iso/2);
                SigmaType = ParticleTable::getSigmaType(iso);
            }
        }
        else{// D++ n 
            if(rdm*3 < 1){
                KaonType = ParticleTable::getKaonType(-iso/2);
                NucleonType = ParticleTable::getNucleonType(iso/2);
                SigmaType = ParticleTable::getSigmaType(iso);
            }
            else if(rdm*3 < 2){
                KaonType = ParticleTable::getKaonType(iso/2);
                NucleonType = ParticleTable::getNucleonType(iso/2);
                SigmaType = SigmaZero;
            }
            else{
                KaonType = ParticleTable::getKaonType(iso/2);
                NucleonType = ParticleTable::getNucleonType(-iso/2);
                SigmaType = ParticleTable::getSigmaType(iso);
            }
        }
        
        particle1->setType(NucleonType);
        particle2->setType(SigmaType);
        
        ParticleList list;
        list.push_back(particle1);
        list.push_back(particle2);
        const ThreeVector &rcol = particle2->getPosition();
        const ThreeVector zero;
        Particle *kaon = new Particle(KaonType,zero,rcol);
        list.push_back(kaon);
        
        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);
        
    }
}