G4NeutronElasticXS.hh

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// -------------------------------------------------------------------
//
// GEANT4 Class header file
//
//
// File name:    G4NeutronElasticXS
//
// Author  Ivantchenko, Geant4, 3-AUG-09
//
 
// Class Description:
// This is a base class for neutron elastic hadronic cross section based on
// data files from G4PARTICLEXSDATA data set 
// Class Description - End
 
#ifndef G4NeutronElasticXS_h
#define G4NeutronElasticXS_h 1
 
#include "G4VCrossSectionDataSet.hh"
#include "globals.hh"
#include "G4PhysicsVector.hh"
#include <vector>
 
class G4DynamicParticle;
class G4ParticleDefinition;
class G4Element;
class G4VComponentCrossSection;
 
class G4NeutronElasticXS final : public G4VCrossSectionDataSet
{
public: 
 
  G4NeutronElasticXS();
 
  ~G4NeutronElasticXS() final;
    
  static const char* Default_Name() {return "G4NeutronElasticXS";}
 
  G4bool IsElementApplicable(const G4DynamicParticle*, 
                 G4int Z, const G4Material*) final;
 
  G4bool IsIsoApplicable(const G4DynamicParticle*, G4int Z, G4int A,
             const G4Element*, const G4Material*) final;
 
  G4double GetElementCrossSection(const G4DynamicParticle*, 
                      G4int Z, const G4Material*) final; 
 
  G4double GetIsoCrossSection(const G4DynamicParticle*, G4int Z, G4int A,
                              const G4Isotope* iso,
                              const G4Element* elm,
                              const G4Material* mat) final;
 
  G4double ComputeCrossSectionPerElement(G4double kinEnergy, G4double loge,
                                         const G4ParticleDefinition*,
                                         const G4Element*,
                                         const G4Material*) final;
  
  G4double ComputeIsoCrossSection(G4double kinEnergy, G4double loge,
                                  const G4ParticleDefinition*,
                                  G4int Z, G4int A,
                                  const G4Isotope* iso,
                                  const G4Element* elm,
                                  const G4Material* mat) final;
 
  const G4Isotope* SelectIsotope(const G4Element*, 
                                 G4double kinEnergy, G4double logE) final;
 
  void BuildPhysicsTable(const G4ParticleDefinition&) final;
 
  void CrossSectionDescription(std::ostream&) const final;
 
  G4double ElementCrossSection(G4double kinEnergy, G4double loge, G4int Z);
 
  G4NeutronElasticXS & operator=(const G4NeutronElasticXS &right) = delete;
  G4NeutronElasticXS(const G4NeutronElasticXS&) = delete;
  
private: 
 
  void Initialise(G4int Z);
 
  void InitialiseOnFly(G4int Z);
 
  const G4String& FindDirectoryPath();
 
  inline G4PhysicsVector* GetPhysicsVector(G4int Z);
 
  G4VComponentCrossSection* ggXsection = nullptr;
  const G4ParticleDefinition* neutron;
 
  G4bool isFirst = false;
 
  static const G4int MAXZEL = 93;
  static G4PhysicsVector* data[MAXZEL];
  static G4double coeff[MAXZEL];
  static G4String gDataDirectory;
  static G4bool fLock;
};
 
inline
G4PhysicsVector* G4NeutronElasticXS::GetPhysicsVector(G4int Z)
{
  if(nullptr == data[Z]) { InitialiseOnFly(Z); }
  return data[Z];
}
 
#endif