G4AlphaGEMCoulombBarrier.hh

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//
// J. M. Quesada (July 2009) based on G4AlphaCoulombBarrier
// Coded strictly according to Furihata's GEM paper 
//


#ifndef G4AlphaGEMCoulombBarrier_h
#define G4AlphaGEMCoulombBarrier_h 1

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

class G4AlphaGEMCoulombBarrier : public G4GEMCoulombBarrier
{
public:
  G4AlphaGEMCoulombBarrier() : G4GEMCoulombBarrier(4,2) {};
  ~G4AlphaGEMCoulombBarrier() {};
  
private:
  G4AlphaGEMCoulombBarrier(const G4AlphaGEMCoulombBarrier & right);
  
  const G4AlphaGEMCoulombBarrier & operator=(const G4AlphaGEMCoulombBarrier & right);
  G4bool operator==(const G4AlphaGEMCoulombBarrier & right) const;
  G4bool operator!=(const G4AlphaGEMCoulombBarrier & right) const;
  
public:
  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)
    // dataKa = {{20, 0.81}, {30, 0.85}, {40, 0.89}, {50, 0.93}};
    //
    G4double K = 1.0;   
    if (aZ >= 50){
      K=0.93;     
    } else if (aZ <= 20) {
      K=0.81; 
    } else K=0.729802+0.00402544*aZ-1.17276*1e-6*aZ*aZ+2.31248*1e-8*aZ*aZ*aZ-1.65177*1e-10*aZ*aZ*aZ*aZ; 
    return K;
  }
};

#endif

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