G4AlphaCoulombBarrier.cc

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// $Id: G4AlphaCoulombBarrier.cc 97097 2016-05-25 07:50:31Z gcosmo $
//
// Hadronic Process: Nuclear De-excitations
// by V. Lara (Dec 1999)


#include "G4AlphaCoulombBarrier.hh"

G4AlphaCoulombBarrier::G4AlphaCoulombBarrier() : G4CoulombBarrier(4,2) {}
G4AlphaCoulombBarrier::~G4AlphaCoulombBarrier() {}

G4double G4AlphaCoulombBarrier::BarrierPenetrationFactor(G4int aZ) const
{
  // Data comes from 
  // Dostrovsky, Fraenkel and Friedlander
  // Physical Review, vol 116, num. 3 1959
  // 
  // const G4int size = 5;
  // const G4double Zlist[size]  = {10.0, 20.0, 30.0, 50.0, 70.0};
  // const G4double Kalpha[size] = {0.68, 0.82, 0.91, 0.97, 0.98};
  return  (aZ >= 70) ? 0.98 :
    (((0.23684e-5*aZ) - 0.42143e-3)*aZ + 0.25222e-1)*aZ + 0.46699;
}