G4LEAlphaInelastic.cc

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//
// Hadronic Process: Alpha Inelastic Process
// J.L. Chuma, TRIUMF, 25-Feb-1997
// J.L. Chuma, 08-May-2001: Update original incident passed back in vec[0]
//                          from NuclearReaction

#include <iostream>

#include "G4LEAlphaInelastic.hh"
#include "G4SystemOfUnits.hh"
#include "Randomize.hh"
#include "G4Electron.hh"

G4LEAlphaInelastic::G4LEAlphaInelastic(const G4String& name)
 : G4InelasticInteraction(name)
{
  SetMinEnergy(0.0*GeV);
  SetMaxEnergy(10.*TeV);
  G4cout << "WARNING: model G4LEAlphaInelastic is being deprecated and will\n"
         << "disappear in Geant4 version 10.0"  << G4endl;
}


void G4LEAlphaInelastic::ModelDescription(std::ostream& outFile) const
{
  outFile << "G4LEAlphaInelastic is one of the Low Energy Parameterized\n"
          << "(LEP) models used to implement inelastic alpha 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 alphas with initial energies between 0 and 10\n"
          << "TeV.\n";
}


G4HadFinalState*
G4LEAlphaInelastic::ApplyYourself(const G4HadProjectile& aTrack,
                                  G4Nucleus& targetNucleus)
{
  theParticleChange.Clear();
  const G4HadProjectile* originalIncident = &aTrack;

  G4double A = targetNucleus.GetA_asInt();
  G4double Z = targetNucleus.GetZ_asInt();
        
  G4double kineticEnergy = aTrack.Get4Momentum().e()-aTrack.GetDefinition()->GetPDGMass();
  if (verboseLevel > 1) {
    const G4Material *targetMaterial = aTrack.GetMaterial();
    G4cout << "G4LEAlphaInelastic::ApplyYourself called" << G4endl;
    G4cout << "kinetc energy = " <<kineticEnergy/MeV << "MeV, ";
    G4cout << "target material = " << targetMaterial->GetName() << G4endl;
  }
    
  // Work-around for lack of model above 100 MeV
  if (kineticEnergy/MeV > 100. || kineticEnergy <= 0.1*MeV) {
    theParticleChange.SetStatusChange(isAlive);
    theParticleChange.SetEnergyChange(aTrack.GetKineticEnergy());
    theParticleChange.SetMomentumChange(aTrack.Get4Momentum().vect().unit()); 
    return &theParticleChange;      
  }
  G4double theAtomicMass = targetNucleus.AtomicMass( A, Z );
  G4double massVec[9];
  massVec[0] = targetNucleus.AtomicMass( A+4.0, Z+2.0 );
  massVec[1] = targetNucleus.AtomicMass( A+3.0, Z+2.0 );
  massVec[2] = targetNucleus.AtomicMass( A+3.0, Z+1.0 );
  massVec[3] = targetNucleus.AtomicMass( A+2.0, Z+1.0 );
  massVec[4] = targetNucleus.AtomicMass( A+1.0, Z+1.0 );
  massVec[5] = theAtomicMass;
  massVec[6] = targetNucleus.AtomicMass( A+2.0, Z+2.0 );
  massVec[7] = massVec[3];
  massVec[8] = targetNucleus.AtomicMass( A+2.0, Z     );

  G4FastVector<G4ReactionProduct,4> vec;  // vec will contain the secondary particles
  G4int vecLen = 0;
  vec.Initialize( 0 );

  theReactionDynamics.NuclearReaction(vec, vecLen, &aTrack,
                                      targetNucleus, theAtomicMass, massVec);

  G4double p = vec[0]->GetMomentum().mag();
  theParticleChange.SetMomentumChange( vec[0]->GetMomentum() *(1./p));
  theParticleChange.SetEnergyChange( vec[0]->GetKineticEnergy() );
  delete vec[0];

  if (vecLen <= 1) 
    {
      theParticleChange.SetStatusChange(isAlive);
      theParticleChange.SetEnergyChange(aTrack.GetKineticEnergy());
      theParticleChange.SetMomentumChange(aTrack.Get4Momentum().vect().unit()); 
      return &theParticleChange;      
    }

  G4DynamicParticle *pd;
  for (G4int i = 1; i < vecLen; ++i) {
    pd = new G4DynamicParticle();
    pd->SetDefinition( vec[i]->GetDefinition() );
    pd->SetMomentum( vec[i]->GetMomentum() );
    theParticleChange.AddSecondary( pd );
    delete vec[i];
  }

  if (isotopeProduction) DoIsotopeCounting(originalIncident, targetNucleus); 
  return &theParticleChange;
}

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