G4HadronElasticDataSet.cc

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// G4 Physics class: HadronElasticDataSet for cross sections
// F.W. Jones, TRIUMF, 28-JAN-98
// 
// Modified: V.Ivanchenko
//

#include "G4HadronElasticDataSet.hh"
#include "G4HadronCrossSections.hh"
#include "G4DynamicParticle.hh"
#include "G4NistManager.hh"
#include <iostream>

G4HadronElasticDataSet::G4HadronElasticDataSet(const G4String& nam)
  : G4VCrossSectionDataSet(nam), theZ(0),fElasticXS(0.0),
    fKinEnergy(0.0),fParticle(nullptr)
{
  fGheishaXS = G4HadronCrossSections::Instance(); 
  fNIST = G4NistManager::Instance();
}

G4HadronElasticDataSet::~G4HadronElasticDataSet() {}

void 
G4HadronElasticDataSet::CrossSectionDescription(std::ostream& outFile) const
{
  outFile << "G4HadronElasticDataSet contains elastic cross sections for\n"
          << "all long-lived hadrons at all incident energies.  It was\n"
          << "developed as part of the Gheisha hadronic package\n"
          << "by H. Fesefeldt, and consists of a set of parameterizations\n"
          << "of elastic scattering data.\n";
}

G4bool
G4HadronElasticDataSet::IsElementApplicable(const G4DynamicParticle*, 
              G4int, const G4Material*)
{
  return true;
}

G4double G4HadronElasticDataSet::GetElementCrossSection(
         const G4DynamicParticle* aParticle, G4int Z, const G4Material*)
{
  G4double ekin = aParticle->GetKineticEnergy();
  const G4ParticleDefinition* pd = aParticle->GetDefinition();
  if(Z != theZ || ekin != fKinEnergy || pd != fParticle) {
    theZ = Z;
    fKinEnergy = ekin;
    fParticle = pd;
    G4int A = G4lrint(fNIST->GetAtomicMassAmu(Z));
    fElasticXS = fGheishaXS->GetElasticCrossSection(aParticle, Z, A);
  }
  return fElasticXS;
}