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// $Id: G4CameronGilbertPairingCorrections.hh,v 1.5 2009/03/04 11:05:02 gcosmo Exp $
// GEANT4 tag $Name: geant4-09-03-ref-09 $
//
// Hadronic Process: Nuclear De-excitations
// by V. Lara


#ifndef G4CameronGilbertPairingCorrections_h
#define G4CameronGilbertPairingCorrections_h 1

#include "globals.hh"


//#define verbose 1

class G4CameronGilbertPairingCorrections
{
private:
  // Dummy constructor
  G4CameronGilbertPairingCorrections();
	
  static G4CameronGilbertPairingCorrections* theInstance;


public:
  static G4CameronGilbertPairingCorrections* GetInstance();

  ~G4CameronGilbertPairingCorrections();

  G4double GetPairingCorrection(const G4int A, const G4int Z) const
  {
    return GetPairingZ(Z) + GetPairingN(A-Z);
  }

  G4double GetPairingZ(const G4int Z) const 
  {
    if (IsInTableThisZ(Z)) return PairingZTable[Z-ZTableMin]*MeV;
    else {
#ifdef verbose
      G4cerr << "G4CameronGilbertPairingCorrections: out of table for Z = " << Z << G4endl;
#endif
      return 0.0;
    }
  }

  G4bool IsInTableThisZ(const G4int Z) const 
  {
    if ( Z >= ZTableMin && Z <= ZTableMax ) return true;
    else return false;
  }

	
  G4double GetPairingN(const G4int N) const 
  {
   if (IsInTableThisN(N)) return PairingNTable[N-NTableMin]*MeV;
    else {
#ifdef verbose
      G4cerr << "G4CameronGilbertPairingCorrections: out of table for N = " << N << G4endl;
#endif
      return 0.0;
    }
  }

  G4bool IsInTableThisN(const G4int N) const 
  {
    if ( N >= NTableMin && N <= NTableMax ) return true;
    else return false;
  }


  enum  { ZTableSize = 88, NTableSize = 140, ZTableMin = 11, ZTableMax = 98,
	  NTableMin = 11, NTableMax = 150 };

private:



  static const G4double PairingZTable[ZTableSize];

  static const G4double PairingNTable[NTableSize];
	
};
#endif
