G4AlphaCoulombBarrier.cc

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// $Id: G4AlphaCoulombBarrier.cc 67983 2013-03-13 10:42:03Z gcosmo $
//
// Hadronic Process: Nuclear De-excitations
// by V. Lara (Dec 1999)


#include "G4AlphaCoulombBarrier.hh"
#include "G4HadronicException.hh"

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


G4double G4AlphaCoulombBarrier::BarrierPenetrationFactor(G4double 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};
    G4double K = 1.0;
    if (aZ>=70.0) {
        K = 0.98;
    } else {
        K = (((0.23684e-5*aZ) - 0.42143e-3)*aZ + 0.25222e-1)*aZ + 0.46699;
    }
    return K;
}