G4LowEGammaNuclearModel.cc

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// Physics model class G4LowEGammaNuclearModel 
// Created:  15 May 2019
// Author  V.Ivanchenko
//  
//

#include "G4LowEGammaNuclearModel.hh"
#include "G4SystemOfUnits.hh"
#include "G4ParticleDefinition.hh"
#include "G4Fragment.hh"
#include "G4NucleiProperties.hh"
#include "G4DynamicParticle.hh"
#include "G4HadSecondary.hh"
#include "G4ReactionProduct.hh"
#include "G4ReactionProductVector.hh"
#include "G4HadronicParameters.hh"
#include "G4HadronicInteractionRegistry.hh"
#include "G4PreCompoundModel.hh"
#include "G4ThreeVector.hh"

G4LowEGammaNuclearModel::G4LowEGammaNuclearModel() 
  : G4HadronicInteraction("GammaNPreco"),lab4mom(0.,0.,0.,0.)
{
  SetMinEnergy( 0.0*CLHEP::GeV );
  SetMaxEnergy( G4HadronicParameters::Instance()->GetMaxEnergy() );

  // reuse existing pre-compound model
  G4HadronicInteraction* p =
    G4HadronicInteractionRegistry::Instance()->FindModel("PRECO");
  fPreco = static_cast<G4PreCompoundModel*>(p);
  if(!fPreco) { fPreco = new G4PreCompoundModel(); }
}

G4LowEGammaNuclearModel::~G4LowEGammaNuclearModel()
{}

void G4LowEGammaNuclearModel::InitialiseModel()
{}

G4HadFinalState* G4LowEGammaNuclearModel::ApplyYourself(
     const G4HadProjectile& aTrack, G4Nucleus& theNucleus)
{
  theParticleChange.Clear();

  G4int A = theNucleus.GetA_asInt();
  G4int Z = theNucleus.GetZ_asInt();

  // Create initial state
  lab4mom.set(0.,0.,0.,G4NucleiProperties::GetNuclearMass(A, Z));
  lab4mom += aTrack.Get4Momentum();

  G4Fragment frag(A, Z, lab4mom);

  if (verboseLevel > 1) {
    G4cout << "G4LowEGammaNuclearModel::ApplyYourself initial G4Fragmet:" 
     << G4endl;
    G4cout << frag << G4endl;
  }
  G4ReactionProductVector* res = fPreco->DeExcite(frag);

  // secondaries produced
  if(res) {

    theParticleChange.SetStatusChange(stopAndKill);
    G4int nsec = res->size();
    if (verboseLevel > 1) {
      G4cout << "G4LowEGammaNuclearModel: " << nsec << " secondaries" << G4endl;
    }
    for(G4int i=0; i<nsec; ++i) {
      if((*res)[i]) {
  G4double ekin = (*res)[i]->GetKineticEnergy();
  G4ThreeVector dir(0.,0.,1.);
  if(ekin > 0.0) { dir = (*res)[i]->GetMomentum().unit(); }
  G4HadSecondary* news = new G4HadSecondary(
          new G4DynamicParticle((*res)[i]->GetDefinition(), dir, ekin));
  news->SetTime((*res)[i]->GetTOF());
  news->SetCreatorModelType((*res)[i]->GetCreatorModel());
  theParticleChange.AddSecondary(*news);
  if (verboseLevel > 1) {
    G4cout << i << ". " << (*res)[i]->GetDefinition()->GetParticleName()
     << " Ekin(MeV)= " << ekin/MeV
     << " dir: " << dir << G4endl;
  }
  delete (*res)[i];
        delete news;
      }
    } 
    delete res;
  } 
  return &theParticleChange;
}