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// $Id: G4PreCompoundNucleon.hh,v 1.7 2010/08/28 15:16:55 vnivanch Exp $
// GEANT4 tag $Name: geant4-09-03-ref-09 $
//
// J. M. Quesada (August 2008).  
// Based  on previous work by V. Lara
//
// Modified:
// 20.08.2010 V.Ivanchenko added int Z and A and cleanup; added 
//                        G4ParticleDefinition to constructor


#ifndef G4PreCompoundNucleon_h
#define G4PreCompoundNucleon_h 1

#include "G4PreCompoundFragment.hh"

class G4PreCompoundNucleon : public G4PreCompoundFragment
{
public:  

  G4PreCompoundNucleon(const G4ParticleDefinition*,
		       G4VCoulombBarrier * aCoulombBarrier);
  
  virtual ~G4PreCompoundNucleon();
    
protected:

  virtual G4double 
  ProbabilityDistributionFunction(G4double eKin,
				  const G4Fragment& aFragment);

  virtual G4double CrossSection(G4double ekin) = 0; 

  virtual G4double 
  GetRj(G4int NumberParticles, G4int NumberCharged) = 0; 

  virtual G4double GetAlpha() = 0;

  virtual G4double GetBeta() = 0;

  inline G4double GetOpt0(G4double ekin);

private:

  // default constructor
  G4PreCompoundNucleon();
  // operators
  G4PreCompoundNucleon(const G4PreCompoundNucleon &right);
  const G4PreCompoundNucleon& 
  operator= (const G4PreCompoundNucleon &right);
  G4int operator==(const G4PreCompoundNucleon &right) const;
  G4int operator!=(const G4PreCompoundNucleon &right) const;    

  G4double fact;
};

// *********************** OPT=0 : Dostrovski's cross section  ***************
inline G4double G4PreCompoundNucleon::GetOpt0(G4double K)
{
  G4double r0 = theParameters->Getr0()*ResidualA13();
  // cross section is now given in mb (r0 is in mm) for the sake of consistency
  //with the rest of the options
  return 1.e+25*CLHEP::pi*r0*r0*ResidualA13()*GetAlpha()*(1.+GetBeta()/K);
}

#endif