G4LENeutronInelastic Class Reference

#include <G4LENeutronInelastic.hh>

Inheritance diagram for G4LENeutronInelastic:

Public Member Functions
	G4LENeutronInelastic ()
	~G4LENeutronInelastic ()
G4HadFinalState *	ApplyYourself (const G4HadProjectile &aTrack, G4Nucleus &targetNucleus)
virtual void	ModelDescription (std::ostream &outFile) const

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Detailed Description

Definition at line 44 of file G4LENeutronInelastic.hh.

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Constructor & Destructor Documentation

G4LENeutronInelastic::G4LENeutronInelastic

(

)

[inline]

Definition at line 48 of file G4LENeutronInelastic.hh.

References G4cout, G4endl, G4HadronicInteraction::SetMaxEnergy(), and G4HadronicInteraction::SetMinEnergy().

                           : G4InelasticInteraction("G4LENeutronInelastic")
    {
      SetMinEnergy(0.0);
      SetMaxEnergy(55.*CLHEP::GeV);
      G4cout << "WARNING: model G4LENeutronInelastic is being deprecated and will\n"
             << "disappear in Geant4 version 10.0"  << G4endl;
    }

G4LENeutronInelastic::~G4LENeutronInelastic

(

)

[inline]

Definition at line 56 of file G4LENeutronInelastic.hh.

{}

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Member Function Documentation

G4HadFinalState * G4LENeutronInelastic::ApplyYourself	(	const G4HadProjectile &	aTrack,
		G4Nucleus &	targetNucleus
	)			[virtual]

Implements G4HadronicInteraction.

Definition at line 52 of file G4LENeutronInelastic.cc.

References G4InelasticInteraction::CalculateMomenta(), G4Nucleus::Cinema(), G4HadFinalState::Clear(), G4InelasticInteraction::DoIsotopeCounting(), G4Nucleus::EvaporationEffects(), G4cout, G4endl, G4UniformRand, G4HadProjectile::GetDefinition(), G4DynamicParticle::GetDefinition(), G4ReactionProduct::GetKineticEnergy(), G4HadProjectile::GetKineticEnergy(), G4HadProjectile::GetMaterial(), G4ReactionProduct::GetMomentum(), G4Material::GetName(), G4ParticleDefinition::GetParticleName(), G4ParticleDefinition::GetPDGMass(), G4FastVector< Type, N >::Initialize(), G4InelasticInteraction::isotopeProduction, G4InuclParticleNames::pp, G4Nucleus::ReturnTargetParticle(), G4ReactionProduct::SetKineticEnergy(), G4ReactionProduct::SetMomentum(), G4ReactionProduct::SetSide(), G4InelasticInteraction::SetUpChange(), G4HadronicInteraction::theParticleChange, and G4HadronicInteraction::verboseLevel.

Referenced by G4NeutronHPorLEInelasticModel::ApplyYourself().

{
  theParticleChange.Clear();
  const G4HadProjectile *originalIncident = &aTrack;

  // Create the target particle
  G4DynamicParticle* originalTarget = targetNucleus.ReturnTargetParticle();
    
  if (verboseLevel > 1) {
    const G4Material* targetMaterial = aTrack.GetMaterial();
    G4cout << "G4LENeutronInelastic::ApplyYourself called" << G4endl;
    G4cout << "kinetic energy = " << originalIncident->GetKineticEnergy()/MeV << "MeV, ";
    G4cout << "target material = " << targetMaterial->GetName() << ", ";
    G4cout << "target particle = " << originalTarget->GetDefinition()->GetParticleName()
           << G4endl;
  }
 
  G4ReactionProduct modifiedOriginal;
  modifiedOriginal = *originalIncident;
  G4ReactionProduct targetParticle;
  targetParticle = *originalTarget;
  if (originalIncident->GetKineticEnergy()/GeV < 0.01 + 2.*G4UniformRand()/9.) {
    SlowNeutron(originalIncident, modifiedOriginal, targetParticle, targetNucleus);
    if (isotopeProduction) DoIsotopeCounting(originalIncident, targetNucleus);
    delete originalTarget;
    return &theParticleChange;
  }

  // Fermi motion and evaporation
  // As of Geant3, the Fermi energy calculation had not been done
  G4double ek = originalIncident->GetKineticEnergy()/MeV;
  G4double amas = originalIncident->GetDefinition()->GetPDGMass()/MeV;
    
  G4double tkin = targetNucleus.Cinema(ek);
  ek += tkin;
  modifiedOriginal.SetKineticEnergy( ek*MeV );
  G4double et = ek + amas;
  G4double p = std::sqrt( std::abs((et-amas)*(et+amas)) );
  G4double pp = modifiedOriginal.GetMomentum().mag()/MeV;
  if (pp > 0.0) {
    G4ThreeVector momentum = modifiedOriginal.GetMomentum();
    modifiedOriginal.SetMomentum(momentum * (p/pp) );
  }

  // calculate black track energies
  tkin = targetNucleus.EvaporationEffects( ek );
  ek -= tkin;
  modifiedOriginal.SetKineticEnergy( ek*MeV );
  et = ek + amas;
  p = std::sqrt( std::abs((et-amas)*(et+amas)) );
  pp = modifiedOriginal.GetMomentum().mag()/MeV;
  if (pp > 0.0) {
    G4ThreeVector momentum = modifiedOriginal.GetMomentum();
    modifiedOriginal.SetMomentum(momentum * (p/pp) );
  }
  const G4double cutOff = 0.1;
  if (modifiedOriginal.GetKineticEnergy()/MeV <= cutOff) {
    SlowNeutron(originalIncident, modifiedOriginal, targetParticle, targetNucleus);
    if (isotopeProduction) DoIsotopeCounting(originalIncident, targetNucleus);
    delete originalTarget;
    return &theParticleChange;
  }

  G4ReactionProduct currentParticle = modifiedOriginal;
  currentParticle.SetSide(1);  // incident always goes in forward hemisphere
  targetParticle.SetSide(-1);  // target always goes in backward hemisphere
  G4bool incidentHasChanged = false;
  G4bool targetHasChanged = false;
  G4bool quasiElastic = false;
  G4FastVector<G4ReactionProduct,GHADLISTSIZE> vec;  // vec will contain the secondary particles
  G4int vecLen = 0;
  vec.Initialize(0);
    
  Cascade(vec, vecLen, originalIncident, currentParticle, targetParticle,
          incidentHasChanged, targetHasChanged, quasiElastic);
    
  CalculateMomenta(vec, vecLen, originalIncident, originalTarget,
                   modifiedOriginal, targetNucleus, currentParticle,
                   targetParticle, incidentHasChanged, targetHasChanged,
                   quasiElastic);
    
  SetUpChange(vec, vecLen, currentParticle, targetParticle, incidentHasChanged);
   
  if (isotopeProduction) DoIsotopeCounting(originalIncident, targetNucleus); 
  delete originalTarget;
  return &theParticleChange;
}

void G4LENeutronInelastic::ModelDescription

(

std::ostream &

outFile

)

const [virtual]

Reimplemented from G4HadronicInteraction.

Definition at line 37 of file G4LENeutronInelastic.cc.

{
  outFile << "G4LENeutronInelastic is one of the Low Energy Parameterized\n"
          << "(LEP) models used to implement inelastic neutron scattering\n"
          << "from nuclei.  It is a re-engineered version of the GHEISHA\n"
          << "code of H. Fesefeldt.  It divides the initial collision\n"
          << "products into backward- and forward-going clusters which are\n"
          << "then decayed into final state hadrons.  The model does not\n"
          << "conserve energy on an event-by-event basis.  It may be\n"
          << "applied to neutrons with initial energies between 0 and 25\n"
          << "GeV.\n";
}

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

• G4LENeutronInelastic.hh
• G4LENeutronInelastic.cc

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