G4INCLNuclearPotentialEnergyIsospin.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"
 
/** \file G4INCLNuclearPotentialEnergyIsospin.cc
 * \brief Isospin- and energy-dependent nuclear potential.
 *
 * Provides an isospin- and energy-dependent nuclear potential.
 *
 * \date 21 March 2011
 * \author Davide Mancusi
 */
 
#include "G4INCLNuclearPotentialEnergyIsospin.hh"
#include "G4INCLParticleTable.hh"
#include "G4INCLGlobals.hh"
 
namespace G4INCL {
 
  namespace NuclearPotential {
 
    const G4double NuclearPotentialEnergyIsospin::alpha= 0.223;
 
    // Constructors
    NuclearPotentialEnergyIsospin::NuclearPotentialEnergyIsospin(const G4int A, const G4int Z, const G4bool aPionPotential)
      : NuclearPotentialIsospin(A,Z,aPionPotential)
    {}
 
    // Destructor
    NuclearPotentialEnergyIsospin::~NuclearPotentialEnergyIsospin() {}
 
    G4double NuclearPotentialEnergyIsospin::computePotentialEnergy(const Particle *particle) const {
 
      const G4double v0 = NuclearPotentialIsospin::computePotentialEnergy(particle);
 
      if(particle->isNucleon()) {
        const G4double t = particle->getKineticEnergy();
        const G4double tf = getFermiEnergy(particle);
        // Constant potential for T<Tf
        if(t < tf)
          return v0;
 
        // Linear function for T>Tf
        const G4double v = v0 - alpha*(t-tf)/(1-alpha);
        return (v>0.0) ? v : 0.0; // return 0.0 if v is negative
      } else
        return v0;
    }
 
  }
}