G4INCLNuclearPotentialIsospin.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 G4INCLNuclearPotentialIsospin.cc
 * \brief Isospin-dependent nuclear potential.
 *
 * Provides an isospin-dependent nuclear potential.
 *
 * \date 28 February 2011
 * \author Davide Mancusi
 */
 
#include "G4INCLNuclearPotentialIsospin.hh"
#include "G4INCLNuclearPotentialConstant.hh"
#include "G4INCLParticleTable.hh"
#include "G4INCLGlobals.hh"
 
namespace G4INCL {
 
  namespace NuclearPotential {
 
    // Constructors
    NuclearPotentialIsospin::NuclearPotentialIsospin(const G4int A, const G4int Z, const G4bool aPionPotential)
      : INuclearPotential(A, Z, aPionPotential)
    {
      initialize();
    }
 
    // Destructor
    NuclearPotentialIsospin::~NuclearPotentialIsospin() {}
 
    void NuclearPotentialIsospin::initialize() {
      const G4double ZOverA = ((G4double) theZ) / ((G4double) theA);
 
      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 * Math::pow13(2.*ZOverA);
      const G4double theProtonFermiEnergy = std::sqrt(fermiMomentum[Proton]*fermiMomentum[Proton] + mp*mp) - mp;
      fermiEnergy[Proton] = theProtonFermiEnergy;
      // Use separation energies from the ParticleTable
      const G4double theProtonSeparationEnergy = ParticleTable::getSeparationEnergy(Proton,theA,theZ);
      separationEnergy[Proton] = theProtonSeparationEnergy;
      vProton = theProtonFermiEnergy + theProtonSeparationEnergy;
 
      fermiMomentum[Neutron] = theFermiMomentum * Math::pow13(2.*(1.-ZOverA));
      const G4double theNeutronFermiEnergy = std::sqrt(fermiMomentum[Neutron]*fermiMomentum[Neutron] + mn*mn) - mn;
      fermiEnergy[Neutron] = theNeutronFermiEnergy;
      // Use separation energies from the ParticleTable
      const G4double theNeutronSeparationEnergy = ParticleTable::getSeparationEnergy(Neutron,theA,theZ);
      separationEnergy[Neutron] = theNeutronSeparationEnergy;
      vNeutron = theNeutronFermiEnergy + theNeutronSeparationEnergy;
 
      vDeltaPlus = vProton;
      vDeltaZero = vNeutron;
      vDeltaPlusPlus = 2.*vDeltaPlus - vDeltaZero;
      vDeltaMinus = 2.*vDeltaZero - vDeltaPlus;
 
      separationEnergy[DeltaPlusPlus] = 2.*theProtonSeparationEnergy - theNeutronSeparationEnergy;
      separationEnergy[DeltaPlus] = theProtonSeparationEnergy;
      separationEnergy[DeltaZero] = theNeutronSeparationEnergy;
      separationEnergy[DeltaMinus] = 2.*theNeutronSeparationEnergy - theProtonSeparationEnergy;
 
      fermiEnergy[DeltaPlusPlus] = vDeltaPlusPlus - separationEnergy[DeltaPlusPlus];
      fermiEnergy[DeltaPlus] = vDeltaPlus - separationEnergy[DeltaPlus];
      fermiEnergy[DeltaZero] = vDeltaZero - separationEnergy[DeltaZero];
      fermiEnergy[DeltaMinus] = vDeltaMinus - separationEnergy[DeltaMinus];
    }
 
    G4double NuclearPotentialIsospin::computePotentialEnergy(const Particle *particle) const {
 
      switch( particle->getType() )
      {
        case Proton:
          return vProton;
          break;
        case Neutron:
          return vNeutron;
          break;
 
        case PiPlus:
        case PiZero:
        case PiMinus:
          return computePionPotentialEnergy(particle);
          break;
 
        case DeltaPlusPlus:
          return vDeltaPlusPlus;
          break;
        case DeltaPlus:
          return vDeltaPlus;
          break;
        case DeltaZero:
          return vDeltaZero;
          break;
        case DeltaMinus:
          return vDeltaMinus;
          break;
      case Composite:
    ERROR("No potential computed for particle of type Cluster.");
    return 0.0;
    break;
      case UnknownParticle:
    ERROR("Trying to compute potential energy for an unknown particle.");
    return 0.0;
    break;
      }
 
      ERROR("There is no potential for this type of particle.");
      return 0.0;
    }
 
  }
}