G4DiffElasticRatio.cc

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// $Id: G4DiffElasticRatio.cc 66241 2012-12-13 18:34:42Z gunter $
//
// -------------------------------------------------------------------
//
// GEANT4 Class file
//
//
// File name:    G4DiffElasticRatio
//
// Author:  V.Grichine 07.10.2014
//
// Modifications:
//
// 16.03.15 V. Grichine safety against H ( A > 1 only ) 

#include "G4DiffElasticRatio.hh"
#include "G4ParticleDefinition.hh"
#include "G4DiffElasticRatio.hh"
#include "G4ComponentGGHadronNucleusXsc.hh"

G4DiffElasticRatio::G4DiffElasticRatio(const G4String& nam, G4int verb) 
  : G4VCrossSectionRatio( nam, verb) 
{
  fGGXsc = new G4ComponentGGHadronNucleusXsc();
  fDDthreshold = 450.*CLHEP::MeV; // ~3 pi masses
}

G4DiffElasticRatio::~G4DiffElasticRatio()
{
  if(fGGXsc) delete fGGXsc;
}


G4double G4DiffElasticRatio::ComputeRatio(const G4ParticleDefinition* theParticleDefinition,
            G4double kinEnergy, 
            G4int Z, G4int A)
{
  G4double ratio = 0.;

  if( A > 1 && kinEnergy > fDDthreshold )
  {
    G4double ggElXsc = fGGXsc->GetElasticElementCrossSection(theParticleDefinition,kinEnergy,
                                                       Z,A);
    G4double ggsdXsc = fGGXsc->GetDiffractionGlauberGribovXsc();

    if( ggElXsc > 0.) ratio = ggsdXsc/ggElXsc;
    else              ratio = 0;
  }
  // G4cout<<theParticleDefinition->GetParticleName()<<"; "<<kinEnergy/CLHEP::GeV<<" GeV; r = "<<ratio<<G4endl;
  return ratio;
}