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// $Id: G4HESigmaZeroInelastic.cc,v 1.11 2006/06/29 20:30:44 gunter Exp $
// GEANT4 tag $Name: geant4-09-02-ref-02 $
//
//

#include "globals.hh"
#include "G4ios.hh"

//
// 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 are 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
// Last modified: 29-July-1998 
 
#include "G4HESigmaZeroInelastic.hh"
#include "G4Gamma.hh"

G4HadFinalState *  G4HESigmaZeroInelastic::
ApplyYourself( const G4HadProjectile &aTrack, G4Nucleus &targetNucleus )
  {
    G4HEVector * pv = new G4HEVector[MAXPART];
    const G4HadProjectile *aParticle = &aTrack;
//    G4DynamicParticle *originalTarget = targetNucleus.ReturnTargetParticle();
    G4HEVector incidentParticle(aParticle);
     
    G4HELambdaInelastic theLambdaInelastic;
    theLambdaInelastic.SetMaxNumberOfSecondaries(MAXPART);
    theLambdaInelastic.SetVerboseLevel(verboseLevel);
    
    G4double incidentTotalMomentum = incidentParticle.getTotalMomentum();
    G4double pgam = G4UniformRand()*incidentTotalMomentum*0.75;
    G4HEVector incidentLambda; 
    incidentLambda.SmulAndUpdate( incidentParticle, 
                                 (incidentTotalMomentum - pgam)/incidentTotalMomentum);                    
    G4DynamicParticle * aLambda = new G4DynamicParticle();
    aLambda->SetDefinition(G4Lambda::Lambda());
    aLambda->SetMomentum(incidentLambda.getMomentum());
    G4HadProjectile aLambdaTrack(*aLambda);
    G4HadFinalState * result = theLambdaInelastic.ApplyYourself(aLambdaTrack, targetNucleus);         	
    vecLength = theLambdaInelastic.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;
  } 
        








