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// $Id: G4BetheBlochModel.hh,v 1.10 2004/02/15 17:08:49 vnivanch Exp $
// GEANT4 tag $Name: geant4-06-01 $
//
// -------------------------------------------------------------------
//
// GEANT4 Class header file
//
//
// File name:     G4BetheBlochModel
//
// Author:        Vladimir Ivanchenko on base of Laszlo Urban code
//
// Creation date: 03.01.2002
//
// Modifications:
//
// 23-12-02 V.Ivanchenko change interface in order to moveto cut per region
// 24-01-03 Make models region aware (V.Ivanchenko)
// 13-02-03 Add name (V.Ivanchenko)
// 12-11-03 Fix for GenericIons (V.Ivanchenko)
//
// 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, const G4String& nam = "BetheBloch");

  ~G4BetheBlochModel();

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

  G4double HighEnergyLimit(const G4ParticleDefinition* p);

  G4double LowEnergyLimit(const G4ParticleDefinition* p);

  void SetHighEnergyLimit(G4double e) {highKinEnergy = e;};

  void SetLowEnergyLimit(G4double e) {lowKinEnergy = e;};

  G4double MinEnergyCut(const G4ParticleDefinition*,
                        const G4MaterialCutsCouple*);

  G4bool IsInCharge(const G4ParticleDefinition*);

  G4double ComputeDEDX(const G4MaterialCutsCouple*,
                       const G4ParticleDefinition*,
                             G4double kineticEnergy,
                             G4double cutEnergy);

  G4double CrossSection(const G4MaterialCutsCouple*,
                        const G4ParticleDefinition*,
                              G4double kineticEnergy,
                              G4double cutEnergy,
                              G4double maxEnergy);

  G4DynamicParticle* SampleSecondary(
                                const G4MaterialCutsCouple*,
                                const G4DynamicParticle*,
                                      G4double tmin,
                                      G4double maxEnergy);

  std::vector<G4DynamicParticle*>* SampleSecondaries(
                                const G4MaterialCutsCouple*,
                                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;
  G4bool   isIon;
};

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

inline G4double G4BetheBlochModel::MaxSecondaryEnergy(
          const G4ParticleDefinition* pd,
                G4double kinEnergy) 
{
  if(isIon) SetParticle(pd);
  G4double tau  = kinEnergy/mass;
  G4double tmax = 2.0*electron_mass_c2*tau*(tau + 2.) /
                  (1. + 2.0*(tau + 1.)*ratio + ratio*ratio);

  return tmax;
}

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

inline G4double G4BetheBlochModel::MaxSecondaryEnergy(const G4DynamicParticle* dp)
{
  if(isIon) {
    mass =  dp->GetMass();
    ratio = electron_mass_c2/mass;
  }
  G4double tau  = dp->GetKineticEnergy()/mass;
  G4double tmax = 2.0*electron_mass_c2*tau*(tau + 2.) /
                  (1. + 2.0*(tau + 1.)*ratio + ratio*ratio);

  return tmax;
}

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

#endif