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// $Id: G4CookPairingCorrections.hh,v 1.6 2010/11/15 16:09:46 vnivanch Exp $
// GEANT4 tag $Name: geant4-09-04-ref-00 $
//
// Hadronic Process: Nuclear De-excitations
// by V. Lara


#ifndef G4CookPairingCorrections_h
#define G4CookPairingCorrections_h 1

#include "globals.hh"

//#define verbose 1

class G4CookPairingCorrections
{
private:
  G4CookPairingCorrections();
	
  static G4CookPairingCorrections* theInstance;
  

public:
  static G4CookPairingCorrections* GetInstance();

  ~G4CookPairingCorrections();

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


  G4double GetPairingZ(G4int Z) const {
    if ( this->IsInTableThisZ(Z) ) return PairingZTable[Z-ZTableMin]*MeV;
    else {
#ifdef verbose
      G4cerr << "G4CookPairingCorrections: 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 ( this->IsInTableThisN(N) ) return PairingNTable[N-NTableMin]*MeV;
    else {
#ifdef verbose
      G4cerr << "G4CookPairingCorrections: 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 = 68, NTableSize = 118, ZTableMin = 28, ZTableMax = 95,
	  NTableMin = 33, NTableMax = 150 };
private:
  

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