G4IonProtonCrossSection.cc

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// -------------------------------------------------------------------
//
// GEANT4 Class file
//
//
// File name:  G4IonProtonCrossSection
//
// Author  Ivantchenko, Geant4, 30 July 2010
//

#include "G4IonProtonCrossSection.hh"
#include "G4SystemOfUnits.hh"
#include "G4ParticleInelasticXS.hh"
#include "G4DynamicParticle.hh"
#include "G4Element.hh"
#include "G4Proton.hh"
#include "G4Log.hh"

using namespace std;

G4IonProtonCrossSection::G4IonProtonCrossSection() 
  : G4VCrossSectionDataSet("InvProtonXS") 
{
  theForward = new G4ParticleInelasticXS(G4Proton::Proton());
}

G4IonProtonCrossSection::~G4IonProtonCrossSection()
{}

G4bool 
G4IonProtonCrossSection::IsElementApplicable(const G4DynamicParticle*, 
               G4int Z, const G4Material*)
{
  return (1 == Z); 
}

G4double 
G4IonProtonCrossSection::GetElementCrossSection(
                                   const G4DynamicParticle* dp, 
           G4int, const G4Material*)
{
  const G4ParticleDefinition* p = dp->GetDefinition();
  G4double e = dp->GetKineticEnergy()*CLHEP::proton_mass_c2/p->GetPDGMass();
  G4int Z = p->GetAtomicNumber();
  G4int A = p->GetAtomicMass();
  return theForward->IsoCrossSection(e, G4Log(e), Z, A);
}

void G4IonProtonCrossSection::BuildPhysicsTable(const G4ParticleDefinition& part)
{
  theForward->BuildPhysicsTable(part);
} 

void 
G4IonProtonCrossSection::CrossSectionDescription(std::ostream& outFile) const
{
  outFile << "G4IonProtonCrossSection calculates the inelastic cross section\n"
          << "for any ion projectile with Z >=2 only on hydrogen target.\n"
          << "It uses the inverse kinematics and the G4ParticleInelasticXS\n"
          << "cross section.\n"; 
}