G4NucleonNuclearCrossSection.cc

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//
// author: Vladimir.Grichine@cern.ch
//
// Implements data from: Barashenkov V.S., Nucleon-Nucleus Cross Section,
// Preprint JINR P2-89-770, p. 12, Dubna 1989 (scanned version from KEK)
// Based on G. Folger version of G4PiNuclearCrossSection class
//
// Modified: 16.08.2018 V.Ivanchenko - major update
//

#include "G4NucleonNuclearCrossSection.hh"
#include "G4DynamicParticle.hh"
#include "G4ParticleDefinition.hh"
#include "G4Neutron.hh"
#include "G4Proton.hh"
#include "G4ComponentBarNucleonNucleusXsc.hh"

// factory
#include "G4CrossSectionFactory.hh"
//
G4_DECLARE_XS_FACTORY(G4NucleonNuclearCrossSection);


G4NucleonNuclearCrossSection::G4NucleonNuclearCrossSection()
 : G4VCrossSectionDataSet(Default_Name()),
   fTotalXsc(0.0), fInelasticXsc(0.0), fElasticXsc(0.0)
{
  theNeutron = G4Neutron::Neutron();
  theProton  = G4Proton::Proton();
  fBarash = new G4ComponentBarNucleonNucleusXsc();  
}

//

G4NucleonNuclearCrossSection::~G4NucleonNuclearCrossSection()
{}


G4bool G4NucleonNuclearCrossSection::IsElementApplicable(
       const G4DynamicParticle*, G4int Z, const G4Material*)
{
  return (Z > 1);
}


G4double G4NucleonNuclearCrossSection::GetElementCrossSection(
         const G4DynamicParticle* dp, G4int Z, const G4Material*)
{
  ComputeCrossSections(dp->GetDefinition(), dp->GetKineticEnergy(), Z);
  return fInelasticXsc;
}


void G4NucleonNuclearCrossSection::ComputeCrossSections(
            const G4ParticleDefinition* pd, 
            G4double kinEnergy, G4int Z)
{
  fBarash->ComputeCrossSections(pd, kinEnergy, Z);
  fTotalXsc = fBarash->GetTotalXsc();
  fInelasticXsc = fBarash->GetInelasticXsc();
  fElasticXsc = fBarash->GetElasticXsc();
}


void G4NucleonNuclearCrossSection::BuildPhysicsTable(const G4ParticleDefinition& part)
{
  fBarash->BuildPhysicsTable(part);
}


void
G4NucleonNuclearCrossSection::CrossSectionDescription(std::ostream& outFile) const
{
  outFile << "G4NucleonNuclearCrossSection is a variant of the Barashenkov\n"
          << "cross section parameterization to be used of protons and\n"
          << "nucleons on targets heavier than hydrogen.  It is intended for\n"
          << "use as a cross section component and is currently used by\n"
          << "G4BGGNucleonInelasticXS.  It is valid for incident energies up\n"
          << "to 1 TeV.\n"; 
}