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//
// Calculation of the total, elastic and inelastic cross-sections
// based on Barashenkov parametrisations of pion data
//
// 16.08.06 V.Ivanchenko - first implementation
// 22.01.07 V.Ivanchenko - add cross section interfaces with Z and A
// 05.03.07 V.Ivanchenko - add IfZAApplicable
//


#ifndef G4UPiNuclearCrossSection_h
#define G4UPiNuclearCrossSection_h

#include "G4VCrossSectionDataSet.hh"
#include "G4DynamicParticle.hh"
#include "G4DataVector.hh"
#include "globals.hh"
#include <vector>

class G4PhysicsTable;

class G4UPiNuclearCrossSection : public G4VCrossSectionDataSet
{
public:
  
  G4UPiNuclearCrossSection();

  virtual ~G4UPiNuclearCrossSection();

  virtual
  G4bool IsApplicable(const G4DynamicParticle* aParticle, 
		      const G4Element* anElement);

  virtual
  G4bool IsZAApplicable(const G4DynamicParticle* aParticle, 
			G4double Z, G4double A);

  virtual 
  G4double GetCrossSection(const G4DynamicParticle* aParticle, 
			   const G4Element* anElement, G4double T=0.);

  virtual 
  G4double GetIsoZACrossSection(const G4DynamicParticle* aParticle, 
				G4double Z, G4double A, G4double T=0.);

  G4double GetElasticCrossSection(const G4DynamicParticle* aParticle, 
				  const G4Element* anElement);

  G4double GetElasticCrossSection(const G4DynamicParticle* aParticle, 
				  G4double Z, G4double A);

  G4double GetInelasticCrossSection(const G4DynamicParticle* aParticle, 
				    const G4Element* anElement);

  G4double GetInelasticCrossSection(const G4DynamicParticle* aParticle, 
				    G4double Z, G4double A);

  void BuildPhysicsTable(const G4ParticleDefinition&);

  void DumpPhysicsTable(const G4ParticleDefinition&);
  
private:

  void Initialise();  

  void AddDataSet(const G4String& p, const G4double* tot, 
		  const G4double* in, const G4double* e, G4int n); 

  G4double Interpolate(G4double Z, G4double A, G4double ekin, 
		       G4PhysicsTable*);

  G4int              NZ;
  std::vector<G4int> theZ;
  G4DataVector       theA;
  G4PhysicsTable*    piPlusElastic;
  G4PhysicsTable*    piPlusInelastic;
  G4PhysicsTable*    piMinusElastic;
  G4PhysicsTable*    piMinusInelastic;

  G4double           aPower;
  G4double           elow;
  G4double           elowest;
  G4double           APower[93];

  const G4ParticleDefinition* piPlus;
  const G4ParticleDefinition* piMinus;
};

inline G4bool G4UPiNuclearCrossSection::IsApplicable(
		     const G4DynamicParticle* part, 
		     const G4Element* elm)
{
  return IsZAApplicable(part, elm->GetZ(), elm->GetN());
}

inline G4bool G4UPiNuclearCrossSection::IsZAApplicable(
		     const G4DynamicParticle* part, 
		     G4double Z, G4double)
{
  return ((part->GetDefinition() == piMinus || 
	   part->GetDefinition() == piPlus) &&
	   Z > 1.5);
}

inline G4double G4UPiNuclearCrossSection::GetCrossSection(
		      const G4DynamicParticle* dp, 
		      const G4Element* elm, G4double)
{
  return GetInelasticCrossSection(dp, elm->GetZ(), elm->GetN());
}

inline G4double G4UPiNuclearCrossSection::GetIsoZACrossSection(
		      const G4DynamicParticle* dp, 
		      G4double Z, G4double A, G4double)
{
  return GetInelasticCrossSection(dp, Z, A);
}

inline G4double G4UPiNuclearCrossSection::GetInelasticCrossSection(
                      const G4DynamicParticle* dp, 
		      const G4Element* elm)
{
  return GetInelasticCrossSection(dp, elm->GetZ(), elm->GetN());
}

inline G4double G4UPiNuclearCrossSection::GetElasticCrossSection(
                      const G4DynamicParticle* dp, 
		      const G4Element* elm)
{
  return GetElasticCrossSection(dp, elm->GetZ(), elm->GetN());
}

#endif
