G4INCLNuclearPotentialConstant.cc

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//
// INCL++ intra-nuclear cascade model
// Pekka Kaitaniemi, CEA and Helsinki Institute of Physics
// Davide Mancusi, CEA
// Alain Boudard, CEA
// Sylvie Leray, CEA
// Joseph Cugnon, University of Liege
//
#define INCLXX_IN_GEANT4_MODE 1

#include "globals.hh"

/** \file G4INCLNuclearPotentialConstant.cc
 * \brief Isospin- and energy-independent nuclear potential.
 *
 * Provides a constant nuclear potential (V0).
 *
 * \date 17 January 2011
 * \author Davide Mancusi
 */

#include "G4INCLNuclearPotentialConstant.hh"
#include "G4INCLParticleTable.hh"

namespace G4INCL {

  namespace NuclearPotential {

    // Constructors
    NuclearPotentialConstant::NuclearPotentialConstant(const G4int A, const G4int Z, const G4bool aPionPotential)
      : INuclearPotential(A, Z, aPionPotential)
    {
      initialize();
    }

    // Destructor
    NuclearPotentialConstant::~NuclearPotentialConstant() {
    }

    void NuclearPotentialConstant::initialize() {
      const G4double mp = ParticleTable::getINCLMass(Proton);
      const G4double mn = ParticleTable::getINCLMass(Neutron);

      const G4double theFermiMomentum = ParticleTable::getFermiMomentum(theA,theZ);

      fermiMomentum[Proton] = theFermiMomentum;
      const G4double theProtonFermiEnergy = std::sqrt(theFermiMomentum*theFermiMomentum + mp*mp) - mp;
      fermiEnergy[Proton] = theProtonFermiEnergy;

      fermiMomentum[Neutron] = theFermiMomentum;
      const G4double theNeutronFermiEnergy = std::sqrt(theFermiMomentum*theFermiMomentum + mn*mn) - mn;
      fermiEnergy[Neutron] = theNeutronFermiEnergy;

      fermiEnergy[DeltaPlusPlus] = fermiEnergy.find(Proton)->second;
      fermiEnergy[DeltaPlus] = fermiEnergy.find(Proton)->second;
      fermiEnergy[DeltaZero] = fermiEnergy.find(Neutron)->second;
      fermiEnergy[DeltaMinus] = fermiEnergy.find(Neutron)->second;

      const G4double theAverageSeparationEnergy = 0.5*(ParticleTable::getSeparationEnergy(Proton,theA,theZ)+ParticleTable::getSeparationEnergy(Neutron,theA,theZ));
      separationEnergy[Proton] = theAverageSeparationEnergy;
      separationEnergy[Neutron] = theAverageSeparationEnergy;

      // Use separation energies from the ParticleTable
      vNucleon = 0.5*(theProtonFermiEnergy + theNeutronFermiEnergy) + theAverageSeparationEnergy;
      vDelta = vNucleon;
      separationEnergy[DeltaPlusPlus] = vDelta - fermiEnergy.find(DeltaPlusPlus)->second;
      separationEnergy[DeltaPlus] = vDelta - fermiEnergy.find(DeltaPlus)->second;
      separationEnergy[DeltaZero] = vDelta - fermiEnergy.find(DeltaZero)->second;
      separationEnergy[DeltaMinus] = vDelta - fermiEnergy.find(DeltaMinus)->second;

      separationEnergy[PiPlus] = 0.;
      separationEnergy[PiZero] = 0.;
      separationEnergy[PiMinus] = 0.;

      INCL_DEBUG("Table of separation energies [MeV] for A=" << theA << ", Z=" << theZ << ":" << std::endl
            << "  proton:  " << separationEnergy[Proton] << std::endl
            << "  neutron: " << separationEnergy[Neutron] << std::endl
            << "  delta++: " << separationEnergy[DeltaPlusPlus] << std::endl
            << "  delta+:  " << separationEnergy[DeltaPlus] << std::endl
            << "  delta0:  " << separationEnergy[DeltaZero] << std::endl
            << "  delta-:  " << separationEnergy[DeltaMinus] << std::endl
            << "  pi+:     " << separationEnergy[PiPlus] << std::endl
            << "  pi0:     " << separationEnergy[PiZero] << std::endl
            << "  pi-:     " << separationEnergy[PiMinus] << std::endl
            );

      INCL_DEBUG("Table of Fermi energies [MeV] for A=" << theA << ", Z=" << theZ << ":" << std::endl
            << "  proton:  " << fermiEnergy[Proton] << std::endl
            << "  neutron: " << fermiEnergy[Neutron] << std::endl
            << "  delta++: " << fermiEnergy[DeltaPlusPlus] << std::endl
            << "  delta+:  " << fermiEnergy[DeltaPlus] << std::endl
            << "  delta0:  " << fermiEnergy[DeltaZero] << std::endl
            << "  delta-:  " << fermiEnergy[DeltaMinus] << std::endl
            );

      INCL_DEBUG("Table of Fermi momenta [MeV/c] for A=" << theA << ", Z=" << theZ << ":" << std::endl
            << "  proton:  " << fermiMomentum[Proton] << std::endl
            << "  neutron: " << fermiMomentum[Neutron] << std::endl
            );
    }

    G4double NuclearPotentialConstant::computePotentialEnergy(const Particle *particle) const {

      switch( particle->getType() )
      {
        case Proton:
        case Neutron:
          return vNucleon;
          break;

        case PiPlus:
        case PiZero:
        case PiMinus:
          return computePionPotentialEnergy(particle);
          break;

        case DeltaPlusPlus:
        case DeltaPlus:
        case DeltaZero:
        case DeltaMinus:
          return vDelta;
          break;
        case UnknownParticle:
          INCL_ERROR("Trying to compute potential energy of an unknown particle.");
          return 0.0;
          break;
        default:
          INCL_ERROR("Trying to compute potential energy of a malformed particle.");
          return 0.0;
          break;
      }
    }

  }
}