G4He3GEMCoulombBarrier.hh

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00025 //
00026 //
00027 // J. M. Quesada (July 2009) based on G4He3CoulombBarrier
00028 // Coded strictly according to Furihata's GEM paper 
00029 //
00030 
00031 
00032 #ifndef G4He3GEMCoulombBarrier_h
00033 #define G4He3GEMCoulombBarrier_h 1
00034 
00035 #include "G4GEMCoulombBarrier.hh"
00036 #include "globals.hh"
00037 
00038 class G4He3GEMCoulombBarrier : public G4GEMCoulombBarrier
00039 {
00040 public:
00041   G4He3GEMCoulombBarrier() : G4GEMCoulombBarrier(3,2) {}
00042   ~G4He3GEMCoulombBarrier() {}
00043   
00044 private:
00045   G4He3GEMCoulombBarrier(const G4He3GEMCoulombBarrier & right);
00046   
00047   const G4He3GEMCoulombBarrier & operator=(const G4He3GEMCoulombBarrier & right);
00048   G4bool operator==(const G4He3GEMCoulombBarrier & right) const;
00049   G4bool operator!=(const G4He3GEMCoulombBarrier & right) const;
00050   
00051 private:
00052   G4double BarrierPenetrationFactor(const G4double aZ) const
00053   {
00054     // Data comes from 
00055     // Dostrovsky, Fraenkel and Friedlander
00056     // Physical Review, vol 116, num. 3 1959
00057     // (JMQ 190709: according to notes added on proof)
00058     // dataKa = {{20, 0.81}, {30, 0.85}, {40, 0.89}, {50, 0.93}};
00059     //
00060     G4double K = 1.0;   
00061     if (aZ >= 50){
00062       K=0.93;     
00063     } else if (aZ <= 20) {
00064       K=0.81; 
00065     } 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; 
00066     return K-0.06;
00067   }
00068 };
00069 
00070 #endif

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