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// $Id: G4HETCProton.cc,v 1.3 2010/08/28 15:16:55 vnivanch Exp $
// GEANT4 tag $Name: geant4-09-03-ref-09 $
//
// by V. Lara
//
// Modified:
// 23.08.2010 V.Ivanchenko general cleanup, move constructor and destructor 
//            the source, use G4Pow

#include "G4HETCProton.hh"
#include "G4Proton.hh"

G4HETCProton::G4HETCProton() 
  : G4HETCChargedFragment(G4Proton::Proton(), &theProtonCoulombBarrier)
{}

G4HETCProton::~G4HETCProton() 
{}

G4double G4HETCProton::GetAlpha()
{
  G4int aZ = GetRestZ();
  G4double C = 0.0;
  if (aZ >= 70) 
    {
      C = 0.10;
    } 
  else 
    {
      C = ((((0.15417e-06*aZ) - 0.29875e-04)*aZ + 0.21071e-02)*aZ - 0.66612e-01)*aZ + 0.98375;
    }
  return 1.0 + C;
}
  
G4double G4HETCProton::GetBeta()
{
  return -GetCoulombBarrier();
}
  
G4double G4HETCProton::GetSpinFactor()
{
  // 2s+1
  return 2.0;
}

G4double G4HETCProton::K(const G4Fragment & aFragment)
{
  // Number of protons in emitted fragment
  G4int Pa = GetZ();

  G4int TargetZ = GetRestZ();
  G4int TargetA = GetRestA();
  G4double r = G4double(TargetZ)/G4double(TargetA);

  G4int P = aFragment.GetNumberOfParticles();
  G4int H = aFragment.GetNumberOfHoles();

  G4double result = 0.0;
  if (P > 0)
    {
      result = (H*r + Pa)/P/r;
    }

  return std::max(0.0,result);
}