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// $Id: G4UHadronElasticProcess.hh,v 1.10 2006/11/16 20:09:13 vnivanch Exp $
// GEANT4 tag $Name: geant4-09-03 $
//
// Geant4 Hadron Elastic Scattering Process -- header file
// 
// Created 21 April 2006 V.Ivanchenko
//  
// Modified:
// 26.09.06 V.Ivanchenko add lowestEnergy
//

// Class Description
// Process for hadron nuclear elastic scattering using optimal 
// combination of Geant4 models
// Class Description - End

#ifndef G4UHadronElasticProcess_h
#define G4UHadronElasticProcess_h 1
 
#include "globals.hh"
#include "G4HadronicProcess.hh"
#include "G4Nucleus.hh"

class G4VQCrossSection;
class G4ParticleDefinition;
class G4CrossSectionDataStore;

class G4UHadronElasticProcess : public G4HadronicProcess
{
public:

  G4UHadronElasticProcess(const G4String& procName = "hElastic", 
			  G4double elow = 19.*MeV);

  virtual ~G4UHadronElasticProcess();
 
  virtual G4VParticleChange* PostStepDoIt(const G4Track& aTrack, 
					  const G4Step& aStep);

  virtual G4bool IsApplicable(const G4ParticleDefinition& aParticleType);

  virtual void BuildPhysicsTable(const G4ParticleDefinition& aParticleType);

  virtual void DumpPhysicsTable(const G4ParticleDefinition& aParticleType);

  virtual G4double GetMeanFreePath(const G4Track&, G4double, 
				   G4ForceCondition*);

  virtual G4double GetMicroscopicCrossSection(const G4DynamicParticle*,
					      const G4Element*,
					      G4double aTemp);

  void SetQElasticCrossSection(G4VQCrossSection*);

private:

  G4VQCrossSection*           qCManager;
  const G4ParticleDefinition* theProton;
  const G4ParticleDefinition* theNeutron;
  const G4ParticleDefinition* theParticle;

  G4CrossSectionDataStore* store;
  G4Nucleus                targetNucleus;

  G4double        xsec[40];
  G4double        xsecH[4];
  G4double        cross;
  G4double        thEnergy;
  G4double        lowestEnergy;

  G4int    pPDG;
  G4bool   first;
};

#endif
