G4CrossSectionElastic.cc

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// -------------------------------------------------------------------
//
// GEANT4 Class file
//
//
// File name:     G4CrossSectionElastic
//
// Author:        Vladimir Ivanchenko
//
// Creation date: 19.11.2010
// Modifications:
//
// Class Description:
//
// Wrapper for elastic cross section build from a component
//
// -------------------------------------------------------------------
//

#include "G4CrossSectionElastic.hh"
#include "G4VComponentCrossSection.hh"
#include "G4ParticleDefinition.hh"
#include "G4DynamicParticle.hh"
#include "G4Element.hh"
#include "G4NistManager.hh"
#include "G4HadronicParameters.hh"

G4CrossSectionElastic::G4CrossSectionElastic(G4VComponentCrossSection* c,
               G4int zmin, G4int zmax, 
               G4double Emin, G4double Emax)
  : G4VCrossSectionDataSet(c->GetName()), component(c),
    Zmin(zmin),Zmax(zmax)
{
  nist = G4NistManager::Instance();
  SetMinKinEnergy(Emin);
  SetMaxKinEnergy(Emax);
}

G4CrossSectionElastic::~G4CrossSectionElastic()
{}
   
G4bool G4CrossSectionElastic::IsElementApplicable(const G4DynamicParticle* p, 
              G4int Z, const G4Material*)
{
  G4double e = p->GetKineticEnergy();
  return 
    (Z >= Zmin && Z <= Zmax && e >= GetMinKinEnergy() && e <= GetMaxKinEnergy()); 
}

G4double 
G4CrossSectionElastic::GetElementCrossSection(const G4DynamicParticle* p, 
                G4int Z, 
                const G4Material*)
{
  return component->GetElasticElementCrossSection(p->GetDefinition(), 
              p->GetKineticEnergy(), 
              Z, nist->GetAtomicMassAmu(Z));
}

void G4CrossSectionElastic::BuildPhysicsTable(const G4ParticleDefinition& p)
{
  component->BuildPhysicsTable(p);
  // For ions, the max energy of applicability of the cross sections must scale
  // with the absolute baryonic number; however, the cross sections objects are
  // often shared between the different types of ions (d, t, He3, alpha, and
  // genericIon) therefore we scale by Zmax - which is safely larger than the
  // number of nucleons of the heaviest nuclides.
  SetMaxKinEnergy( G4HadronicParameters::Instance()->GetMaxEnergy() *
       ( std::abs( p.GetBaryonNumber() ) > 1 ? Zmax : 1 ) );
}

void G4CrossSectionElastic::DumpPhysicsTable(const G4ParticleDefinition& p)
{
  component->DumpPhysicsTable(p);
}

void G4CrossSectionElastic::CrossSectionDescription(std::ostream& outFile) const
{
  component->Description(outFile);
}