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//
// -------------------------------------------------------------------
//
// GEANT4 Class header file
//
//
// File name:     G4BraggModel
//
// Author:        Vladimir Ivanchenko
// 
// Creation date: 03.01.2002
//
// Modifications: 
//
//
// Class Description: 
//
// Implementation of energy loss and delta-electron production
// by heavy slow charged particles using eveluated data

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

#ifndef G4BraggModel_h
#define G4BraggModel_h 1

#include "G4VEmModel.hh"

class G4BraggModel : public G4VEmModel
{

public:

  G4BraggModel(const G4ParticleDefinition* p = 0);

  ~G4BraggModel();

  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 
  G4BraggModel & operator=(const  G4BraggModel &right);
  G4BraggModel(const  G4BraggModel&);

  G4bool HasMaterial(const G4Material* material);

  G4double StoppingPower(const G4Material* material,
                               G4double kineticEnergy);

  G4double ElectronicStoppingPower(G4double z,
                                   G4double kineticEnergy) const;
 
  void SetMoleculaNumber(G4int number) {iMolecula = number;};

  G4double DEDX(const G4Material* material, G4double kineticEnergy);

  G4bool MolecIsInZiegler1988(const G4Material* material);

  G4double ChemicalFactor(G4double kineticEnergy, G4double eloss125) const;

  void SetExpStopPower125(G4double value) {expStopPower125 = value;};

  const G4ParticleDefinition* particle;
  G4double mass;
  G4double spin;
  G4double chargeSquare;
  G4double massRate;
  G4double ratio;
  G4double highKinEnergy;
  G4double lowKinEnergy;
  G4int    iMolecula;          // index in the molecula's table
  G4double protonMassAMU;
  G4double theZieglerFactor;
  G4double expStopPower125;        // Experimental Stopping power at 125keV

};

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

inline G4double G4BraggModel::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 G4BraggModel::MaxSecondaryEnergy(const G4DynamicParticle* dp)
{
  G4double gamma= dp->GetKineticEnergy()/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