G4INCL::ParticleEntryChannel Class Reference

#include <G4INCLParticleEntryChannel.hh>

Inheritance diagram for G4INCL::ParticleEntryChannel:

Collaboration diagram for G4INCL::ParticleEntryChannel:

Public Member Functions
	ParticleEntryChannel (Nucleus *n, Particle *p)
virtual	~ParticleEntryChannel ()
void	fillFinalState (FinalState *fs)
Public Member Functions inherited from G4INCL::IChannel
	IChannel ()
virtual	~IChannel ()
FinalState *	getFinalState ()

Detailed Description

Definition at line 49 of file G4INCLParticleEntryChannel.hh.

Constructor & Destructor Documentation

G4INCL::ParticleEntryChannel::ParticleEntryChannel	(	Nucleus *	n,
		Particle *	p
	)

Definition at line 45 of file G4INCLParticleEntryChannel.cc.

    :theNucleus(n), theParticle(p)
  {}

G4INCL::ParticleEntryChannel::~ParticleEntryChannel ( )

virtual

Definition at line 49 of file G4INCLParticleEntryChannel.cc.

  {}

Member Function Documentation

void G4INCL::ParticleEntryChannel::fillFinalState ( FinalState *  fs )

virtual

Implements G4INCL::IChannel.

Definition at line 52 of file G4INCLParticleEntryChannel.cc.

                                                          {
    // Behaves slightly differency if a third body (the projectile) is present
    G4bool isNN = theNucleus->isNucleusNucleusCollision();

    /* Corrections to the energy of the entering nucleon
     *
     * In particle-nucleus reactions, the goal of this correction is to satisfy
     * energy conservation in particle-nucleus reactions using real particle
     * and nuclear masses.
     *
     * In nucleus-nucleus reactions, in addition to the above, the correction
     * is determined by a model for the excitation energy of the
     * quasi-projectile (QP). The energy of the entering nucleon is such that
     * the QP excitation energy, as determined by conservation, is what given
     * by our model.
     *
     * Possible choices for the correction (or, equivalently, for the QP
     * excitation energy):
     *
     * 1. the correction is 0. (same as in particle-nucleus);
     * 2. the correction is the separation energy of the entering nucleon in
     *    the current QP;
     * 3. the QP excitation energy is given by A. Boudard's algorithm, as
     *    implemented in INCL4.2-HI/Geant4.
     * 4. the QP excitation energy vanishes.
     *
     * Ideally, the QP excitation energy should always be >=0. Algorithms 1.
     * and 2. do not guarantee this, although violations to the rule seem to be
     * more severe for 1. than for 2.. Algorithms 3. and 4., by construction,
     * yields non-negative QP excitation energies.
     */
    G4double theCorrection;
    if(isNN) {
// assert(theParticle->isNucleon());
      ProjectileRemnant * const projectileRemnant = theNucleus->getProjectileRemnant();
// assert(projectileRemnant);

      // No correction (model 1. above)
      /*
      theCorrection = theParticle->getEmissionQValueCorrection(
          theNucleus->getA() + theParticle->getA(),
          theNucleus->getZ() + theParticle->getZ())
        + theParticle->getTableMass() - theParticle->getINCLMass();
      const G4double theProjectileCorrection = 0.;
      */

      // Correct the energy of the entering particle for the Q-value of the
      // emission from the projectile (model 2. above)
      /*
      theCorrection = theParticle->getTransferQValueCorrection(
          projectileRemnant->getA(), projectileRemnant->getZ(),
          theNucleus->getA(), theNucleus->getZ());
      G4double theProjectileCorrection;
      if(projectileRemnant->getA()>theParticle->getA()) { // if there are any particles left
        // Compute the projectile Q-value (to be used as a correction to the
        // other components of the projectile remnant)
        theProjectileCorrection = ParticleTable::getTableQValue(
            projectileRemnant->getA() - theParticle->getA(),
            projectileRemnant->getZ() - theParticle->getZ(),
            theParticle->getA(),
            theParticle->getZ());
      } else
        theProjectileCorrection = 0.;
      */

      // Fix the correction in such a way that the quasi-projectile excitation
      // energy is given by A. Boudard's INCL4.2-HI model (model 3. above).
      const G4double theProjectileExcitationEnergy =
        (projectileRemnant->getA()-theParticle->getA()>1) ?
        (projectileRemnant->computeExcitationEnergyExcept(theParticle->getID())) :
        0.;
      // Set the projectile excitation energy to zero (cold quasi-projectile,
      // model 4. above).
      // const G4double theProjectileExcitationEnergy = 0.;
      // The part that follows is common to model 3. and 4.
      const G4double theProjectileEffectiveMass =
        ParticleTable::getTableMass(projectileRemnant->getA() - theParticle->getA(), projectileRemnant->getZ() - theParticle->getZ())
        + theProjectileExcitationEnergy;
      const ThreeVector &theProjectileMomentum = projectileRemnant->getMomentum() - theParticle->getMomentum();
      const G4double theProjectileEnergy = std::sqrt(theProjectileMomentum.mag2() + theProjectileEffectiveMass*theProjectileEffectiveMass);
      const G4double theProjectileCorrection = theProjectileEnergy - (projectileRemnant->getEnergy() - theParticle->getEnergy());
      theCorrection = theParticle->getEmissionQValueCorrection(
          theNucleus->getA() + theParticle->getA(),
          theNucleus->getZ() + theParticle->getZ())
        + theParticle->getTableMass() - theParticle->getINCLMass()
        + theProjectileCorrection;
      // end of part common to model 3. and 4.


      projectileRemnant->removeParticle(theParticle, theProjectileCorrection);
    } else {
      const G4int ACN = theNucleus->getA() + theParticle->getA();
      const G4int ZCN = theNucleus->getZ() + theParticle->getZ();
      // Correction to the Q-value of the entering particle
      theCorrection = theParticle->getEmissionQValueCorrection(ACN,ZCN);
      INCL_DEBUG("The following Particle enters with correction " << theCorrection << '\n'
          << theParticle->print() << '\n');
    }

    const G4double energyBefore = theParticle->getEnergy() - theCorrection;
    G4bool success = particleEnters(theCorrection);
    fs->addEnteringParticle(theParticle);

    if(!success) {
      fs->makeParticleBelowZero();
    } else if(theParticle->isNucleon() &&
        theParticle->getKineticEnergy()<theNucleus->getPotential()->getFermiEnergy(theParticle)) {
      // If the participant is a nucleon entering below its Fermi energy, force a
      // compound nucleus
      fs->makeParticleBelowFermi();
    }

    fs->setTotalEnergyBeforeInteraction(energyBefore);
  }

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The documentation for this class was generated from the following files:

• geant4.10.03.p01/source/processes/hadronic/models/inclxx/incl_physics/include/G4INCLParticleEntryChannel.hh
• geant4.10.03.p01/source/processes/hadronic/models/inclxx/incl_physics/src/G4INCLParticleEntryChannel.cc