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// $Id$
//
// -------------------------------------------------------------------
//
// GEANT4 Class header file
//
//
// File name:     G4KleinNishinaCompton
//
// Author:        Vladimir Ivanchenko on base of Michel Maire code
//
// Creation date: 15.03.2005
//
// Modifications:
// 18-04-05 Use G4ParticleChangeForGamma (V.Ivantchenko)
//
//
// Class Description:
//
// Implementation of gamma Compton scatteribg on free electron
// 

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

#ifndef G4KleinNishinaCompton_h
#define G4KleinNishinaCompton_h 1

#include "G4VEmModel.hh"

class G4ParticleChangeForGamma;

class G4KleinNishinaCompton : public G4VEmModel
{

public:

  G4KleinNishinaCompton(const G4ParticleDefinition* p = 0, 
			const G4String& nam = "Klein-Nishina");

  virtual ~G4KleinNishinaCompton();

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

  virtual G4double ComputeCrossSectionPerAtom(
                                const G4ParticleDefinition*,
                                      G4double kinEnergy, 
                                      G4double Z, 
                                      G4double A, 
                                      G4double cut,
                                      G4double emax);

  virtual void SampleSecondaries(std::vector<G4DynamicParticle*>*,
				 const G4MaterialCutsCouple*,
				 const G4DynamicParticle*,
				 G4double tmin,
				 G4double maxEnergy);

protected:

  G4ParticleDefinition*     theGamma;
  G4ParticleDefinition*     theElectron;
  G4ParticleChangeForGamma* fParticleChange;
  G4double                  lowestGammaEnergy;

private:

  // hide assignment operator
  G4KleinNishinaCompton & operator=(const  G4KleinNishinaCompton &right);
  G4KleinNishinaCompton(const  G4KleinNishinaCompton&);

};

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#endif