G4HEAntiSigmaZeroInelastic.cc

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// $Id$
//

// G4 Process: Gheisha High Energy Collision model.
// This includes the high energy cascading model, the two-body-resonance model
// and the low energy two-body model.  Not included is the low energy stuff
// like nuclear reactions, nuclear fission without any cascading and all
// processes for particles at rest.  
// First work done by J.L.Chuma and F.W.Jones, TRIUMF, June 96.  
// H. Fesefeldt, RWTH-Aachen, 23-October-1996
 
#include "G4HEAntiSigmaZeroInelastic.hh"
#include "G4Gamma.hh"
#include "globals.hh"
#include "G4ios.hh"

void G4HEAntiSigmaZeroInelastic::ModelDescription(std::ostream& outFile) const
{
  outFile << "G4HEAntiSigmaZeroInelastic is one of the High Energy\n"
          << "Parameterized (HEP) models used to implement inelastic\n"
          << "anti-Sigma0 scattering from nuclei.  It is a re-engineered\n"
          << "version of the GHEISHA code of H. Fesefeldt.  It divides the\n"
          << "initial collision products into backward- and forward-going\n"
          << "clusters which are then decayed into final state hadrons.\n"
          << "The model does not conserve energy on an event-by-event\n"
          << "basis.  It may be applied to anti-Sigma0 with initial\n"
          << "energies above 20 GeV.\n";
}


G4HadFinalState*
G4HEAntiSigmaZeroInelastic::ApplyYourself(const G4HadProjectile& aTrack,
                                          G4Nucleus& targetNucleus)
{
  G4HEVector* pv = new G4HEVector[MAXPART];
  const G4HadProjectile *aParticle = &aTrack;
  G4HEVector incidentParticle(aParticle);
  G4HEAntiLambdaInelastic theAntiLambdaInelastic;
  theAntiLambdaInelastic.SetMaxNumberOfSecondaries(MAXPART);
  theAntiLambdaInelastic.SetVerboseLevel(verboseLevel);
    
  G4double incidentTotalMomentum = incidentParticle.getTotalMomentum();
  G4double pgam = G4UniformRand()*incidentTotalMomentum*0.75;
  G4HEVector incidentAntiLambda; 
  incidentAntiLambda.SmulAndUpdate(incidentParticle, 
                                   (incidentTotalMomentum - pgam)/incidentTotalMomentum);                   
  G4DynamicParticle* aLambda = new G4DynamicParticle();
  aLambda->SetDefinition(G4AntiLambda::AntiLambda());
  aLambda->SetMomentum(incidentAntiLambda.getMomentum());
  G4HadProjectile aLambdaTrack(*aLambda);
  G4HadFinalState* result = theAntiLambdaInelastic.ApplyYourself(aLambdaTrack, targetNucleus);          
  vecLength = theAntiLambdaInelastic.GetNumberOfSecondaries();
  pv[vecLength] = Gamma;
  pv[vecLength].setMomentum(incidentParticle.getMomentum());
  pv[vecLength].SmulAndUpdate( pv[vecLength],pgam/incidentTotalMomentum); 
  G4DynamicParticle * aPhoton = new G4DynamicParticle();
  aPhoton->SetDefinition(G4Gamma::Gamma());
  aPhoton->SetMomentum(pv[vecLength].getMomentum());
  result->AddSecondary(aPhoton);
  delete [] pv;
  return result;
} 

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