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// $Id$
//
// -------------------------------------------------------------------
//
// GEANT4 Class header file
//
//
// File name:     G4MuBetheBlochModel
//
// Author:        Vladimir Ivanchenko on base of Laszlo Urban code
//
// Creation date: 09.08.2002
//
// Modifications:
//
// 23-12-02 Change interface in order to move to cut per region (V.Ivanchenko)
// 24-01-03 Make models region aware (V.Ivanchenko)
// 13-02-03 Add Nama (V.Ivanchenko)
// 10-02-04 Calculation of radiative corrections using R.Kokoulin model (V.I)
// 08-04-05 Major optimisation of internal interfaces (V.Ivantchenko)
// 12-04-05 Add usage of G4EmCorrections (V.Ivanchenko)
// 13-02-06 ComputeCrossSectionPerElectron, ComputeCrossSectionPerAtom (mma)
//

//
// Class Description:
//
// Implementation of Bethe-Bloch model of energy loss and
// delta-electron production by heavy charged particles

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

#ifndef G4MuBetheBlochModel_h
#define G4MuBetheBlochModel_h 1

#include <CLHEP/Units/PhysicalConstants.h>

#include "G4VEmModel.hh"

class G4ParticleChangeForLoss;
class G4EmCorrections;

class G4MuBetheBlochModel : public G4VEmModel
{

public:

  G4MuBetheBlochModel(const G4ParticleDefinition* p = 0,
                      const G4String& nam = "MuBetheBloch");

  virtual ~G4MuBetheBlochModel();

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

  virtual G4double MinEnergyCut(const G4ParticleDefinition*,
				const G4MaterialCutsCouple*);
			
  virtual G4double ComputeCrossSectionPerElectron(
				 const G4ParticleDefinition*,
				 G4double kineticEnergy,
				 G4double cutEnergy,
				 G4double maxEnergy);
				 
  virtual G4double ComputeCrossSectionPerAtom(
				 const G4ParticleDefinition*,
				 G4double kineticEnergy,
				 G4double Z, G4double A,
				 G4double cutEnergy,
				 G4double maxEnergy);
				 				 
  virtual G4double CrossSectionPerVolume(const G4Material*,
				 const G4ParticleDefinition*,
				 G4double kineticEnergy,
				 G4double cutEnergy,
				 G4double maxEnergy);

  virtual G4double ComputeDEDXPerVolume(const G4Material*,
                                        const G4ParticleDefinition*,
                                        G4double kineticEnergy,
                                        G4double cutEnergy);

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

protected:

  virtual G4double MaxSecondaryEnergy(const G4ParticleDefinition*,
				      G4double kinEnergy);

private:

  inline void SetParticle(const G4ParticleDefinition* p);

  // hide assignment operator
  G4MuBetheBlochModel & operator=(const  G4MuBetheBlochModel &right);
  G4MuBetheBlochModel(const  G4MuBetheBlochModel&);

  const G4ParticleDefinition* particle;
  G4ParticleDefinition*       theElectron;
  G4ParticleChangeForLoss*    fParticleChange;
  G4EmCorrections*            corr;

  G4double limitKinEnergy;
  G4double logLimitKinEnergy;
  G4double mass;
  G4double massSquare;
  G4double ratio;
  G4double twoln10;
  G4double bg2lim;
  G4double taulim;
  G4double alphaprime;
  static G4double xgi[8],wgi[8];
};

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......

inline void G4MuBetheBlochModel::SetParticle(const G4ParticleDefinition* p)
{
  if(!particle) {
    particle = p;
    mass = particle->GetPDGMass();
    massSquare = mass*mass;
    ratio = CLHEP::electron_mass_c2/mass;
  }
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.....

#endif