G4AlphaCoulombBarrier.cc

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00026 //
00027 // $Id$
00028 //
00029 // Hadronic Process: Nuclear De-excitations
00030 // by V. Lara (Dec 1999)
00031 
00032 
00033 #include "G4AlphaCoulombBarrier.hh"
00034 #include "G4HadronicException.hh"
00035 
00036 G4AlphaCoulombBarrier::G4AlphaCoulombBarrier() : G4CoulombBarrier(4,2) {}
00037 G4AlphaCoulombBarrier::~G4AlphaCoulombBarrier() {}
00038 
00039 
00040 G4double G4AlphaCoulombBarrier::BarrierPenetrationFactor(G4double aZ) const
00041 {
00042     // Data comes from 
00043     // Dostrovsky, Fraenkel and Friedlander
00044     // Physical Review, vol 116, num. 3 1959
00045     // 
00046     // const G4int size = 5;
00047     // const G4double Zlist[size]  = {10.0, 20.0, 30.0, 50.0, 70.0};
00048     // const G4double Kalpha[size] = {0.68, 0.82, 0.91, 0.97, 0.98};
00049     G4double K = 1.0;
00050     if (aZ>=70.0) {
00051         K = 0.98;
00052     } else {
00053         K = (((0.23684e-5*aZ) - 0.42143e-3)*aZ + 0.25222e-1)*aZ + 0.46699;
00054     }
00055     return K;
00056 }

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