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//
// -------------------------------------------------------------------
//
// GEANT4 Class header file
//
//
// File name:     G4BetheBlochModel
//
// Author:        Vladimir Ivanchenko on base of Laszlo Urban code
// 
// Creation date: 03.01.2002
//
// Modifications: 

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

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

#ifndef G4BetheBlochModel_h
#define G4BetheBlochModel_h 1

#include "G4VEmModel.hh"

class G4BetheBlochModel : public G4VEmModel
{

public:

  G4BetheBlochModel(const G4ParticleDefinition* p = 0);

  ~G4BetheBlochModel();

  G4double HighEnergyLimit(const G4ParticleDefinition* p,
                           const G4Material*);
 
  G4double LowEnergyLimit(const G4ParticleDefinition* p,
                          const G4Material*);

  void SetHighEnergyLimit(const G4Material*, G4double e) {highKinEnergy = e;};
 
  void SetLowEnergyLimit(const G4Material*, G4double e) {lowKinEnergy = e;};

  G4double MinEnergyCut(const G4ParticleDefinition*,
                        const G4Material*);
 
  G4bool IsInCharge(const G4ParticleDefinition*,
	            const G4Material*);

  G4double ComputeDEDX(const G4Material*,
                       const G4ParticleDefinition*,
                             G4double kineticEnergy,
                             G4double cutEnergy);

  G4double CrossSection(const G4Material*,
                        const G4ParticleDefinition*,
                              G4double kineticEnergy,
                              G4double cutEnergy,
                              G4double maxEnergy);

  G4std::vector<G4DynamicParticle*>* SampleSecondary(
                                const G4Material*,
                                const G4DynamicParticle*,
                                      G4double tmin,
                                      G4double maxEnergy);

  G4double MaxSecondaryEnergy(const G4DynamicParticle*);

protected:

  G4double MaxSecondaryEnergy(const G4ParticleDefinition*,
                                    G4double kinEnergy);

private:

  void SetParticle(const G4ParticleDefinition* p);

  // hide assignment operator 
  G4BetheBlochModel & operator=(const  G4BetheBlochModel &right);
  G4BetheBlochModel(const  G4BetheBlochModel&);

  const G4ParticleDefinition* particle;
  G4double mass;
  G4double spin;
  G4double chargeSquare;
  G4double ratio;
  G4double highKinEnergy;
  G4double lowKinEnergy;
  G4double twoln10;
  G4double bg2lim; 
  G4double taulim;
  G4double qc;
};

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

inline G4double G4BetheBlochModel::MaxSecondaryEnergy(
          const G4ParticleDefinition* p,
                G4double kinEnergy) 
{

  G4double gamma= kinEnergy/mass + 1.0;
  G4double tmax = 2.0*electron_mass_c2*(gamma*gamma - 1.) /
                  (1. + 2.0*gamma*ratio + ratio*ratio);
  
  return tmax;
}

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

inline G4double G4BetheBlochModel::MaxSecondaryEnergy(const G4DynamicParticle* dp)
{

  G4double kineticEnergy = dp->GetKineticEnergy();
  G4double gamma= kineticEnergy/mass + 1.0;
  G4double tmax = 2.0*electron_mass_c2*(gamma*gamma - 1.) /
                  (1. + 2.0*gamma*ratio + ratio*ratio);
  
  return tmax;
}

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

#endif