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// -------------------------------------------------------------------
//
//
// GEANT4 Class header file
//
//
// File name:     G4WentzelVIRelModel
//
// Author:        V.Ivanchenko 
//
// Creation date: 08.06.2012 from G4WentzelVIModel
//
// Modifications:
//
// Class Description:
//
// Implementation of the model of multiple scattering based on
// G.Wentzel, Z. Phys. 40 (1927) 590.
// H.W.Lewis, Phys Rev 78 (1950) 526.
// J.M. Fernandez-Varea et al., NIM B73 (1993) 447.
// L.Urban, CERN-OPEN-2006-077.

// -------------------------------------------------------------------
//

#ifndef G4WentzelVIRelModel_h
#define G4WentzelVIRelModel_h 1

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#include "G4WentzelVIModel.hh"
#include "G4Threading.hh"
#include <vector>

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class G4NistManager;

class G4WentzelVIRelModel : public G4WentzelVIModel
{

public:

  explicit G4WentzelVIRelModel();

  virtual ~G4WentzelVIRelModel();

  
  virtual void Initialise(const G4ParticleDefinition*, 
			  const G4DataVector&) override;

  virtual G4double ComputeCrossSectionPerAtom(const G4ParticleDefinition*,
					      G4double KineticEnergy,
					      G4double AtomicNumber,
					      G4double AtomicWeight=0., 
					      G4double cut = DBL_MAX,
					      G4double emax= DBL_MAX) override;

  virtual void DefineMaterial(const G4MaterialCutsCouple* cup);

private:

  void ComputeEffectiveMass();

  //  hide assignment operator
  G4WentzelVIRelModel & operator=(const  G4WentzelVIRelModel &right) = delete;
  G4WentzelVIRelModel(const  G4WentzelVIRelModel&) = delete;

  static std::vector<G4double> effMass;
  G4NistManager* fNistManager;

#ifdef G4MULTITHREADED
  static G4Mutex WentzelVIRelModelMutex;
#endif
};

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#endif

