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// $Id$
//
// -------------------------------------------------------------------
//
//
// GEANT4 Class header file
//
//
// File name:     G4ICRU49NuclearStoppingModel
//
// Author:        V.Ivanchenko 
//
// Creation date: 20.07.2009 
//
// Modifications:
//
//
// Class Description:
//
// Implementation of the ICRU'49 model of nuclear stopping 

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

#ifndef G4ICRU49NuclearStoppingModel_h
#define G4ICRU49NuclearStoppingModel_h 1

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#include "G4VEmModel.hh"

class G4ParticleChangeForLoss;
class G4Pow;

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class G4ICRU49NuclearStoppingModel : public G4VEmModel
{

public:

  G4ICRU49NuclearStoppingModel(const G4String& nam = "ICRU49NucStopping");

  virtual ~G4ICRU49NuclearStoppingModel();

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

  // main method to compute dEdx
  virtual G4double ComputeDEDXPerVolume(const G4Material*,
                                        const G4ParticleDefinition*,
                                        G4double kineticEnergy,
                                        G4double cutEnergy = DBL_MAX);

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

  inline void SetFluctuationFlag(G4bool);

private:

  void InitialiseNuclearStopping();

  G4double NuclearStoppingPower(G4double kineticEnergy,
				G4double Z1, G4double Z2,
				G4double A1, G4double A2);

  //  hide assignment operator
  G4ICRU49NuclearStoppingModel & operator=(const  G4ICRU49NuclearStoppingModel &right);
  G4ICRU49NuclearStoppingModel(const  G4ICRU49NuclearStoppingModel&);

  G4Pow* g4pow;

  static G4double ed[104];
  static G4double ad[104];

  G4double theZieglerFactor;

  // flags
  G4bool   lossFlucFlag;
};

inline void G4ICRU49NuclearStoppingModel::SetFluctuationFlag(G4bool val)
{
  lossFlucFlag = val;
}

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#endif