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);
    
  }
}