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
//
// INCL++ revision: v5.1.8
//
#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);
 
      G4double theFermiMomentum;
      if(theA<ParticleTable::clusterTableASize && theZ<ParticleTable::clusterTableZSize)
        // Use momentum RMS from tables to define the Fermi momentum for light
        // nuclei
        theFermiMomentum = Math::sqrtFiveThirds * ParticleTable::getMomentumRMS(theA,theZ);
      else
        theFermiMomentum = PhysicalConstants::Pf;
 
      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;
    }
 
    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:
          ERROR("Trying to compute potential energy of an unknown particle.");
          return 0.0;
          break;
        default:
          ERROR("Trying to compute potential energy of a malformed particle.");
          return 0.0;
          break;
      }
    }
 
  }
}