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//
// J. M. Quesada (July 2009) based on G4TritonCoulombBarrier
// Coded strictly according to Furihata's GEM paper 
//

#ifndef G4TritonGEMCoulombBarrier_h
#define G4TritonGEMCoulombBarrier_h 1

#include "G4GEMCoulombBarrier.hh"
#include "globals.hh"

class G4TritonGEMCoulombBarrier : public G4GEMCoulombBarrier
{
public:

  G4TritonGEMCoulombBarrier() : G4GEMCoulombBarrier(3,1) {}
  ~G4TritonGEMCoulombBarrier() {}
  
private:
  G4TritonGEMCoulombBarrier(const G4TritonGEMCoulombBarrier & right);
  
  const G4TritonGEMCoulombBarrier & operator=(const G4TritonGEMCoulombBarrier & right);
  G4bool operator==(const G4TritonGEMCoulombBarrier & right) const;
  G4bool operator!=(const G4TritonGEMCoulombBarrier & right) const;
  
private:

  G4double BarrierPenetrationFactor(G4double aZ) const
  {
    // Data comes from 
    // Dostrovsky, Fraenkel and Friedlander
    // Physical Review, vol 116, num. 3 1959
    // (JMQ 190709: according to notes added on proof)
    //dataK = {{20, 0.51}, {30, 0.60}, {40, 0.66}, {50, 0.68}};
    //
    G4double K = 1.0;	
    if (aZ >= 50){
      K=0.68;     
    } else if (aZ <= 20) {
      K=0.51; 
    } else K=0.28445+0.0115956*aZ+0.000026329*aZ*aZ-2.18583*1e-6*aZ*aZ*aZ+3.7083*1e-9*aZ*aZ*aZ*aZ;	
    return K+0.12;
  }
};

#endif