G4ParticleHPWattSpectrum.cc

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//
// neutron_hp -- source file
// J.P. Wellisch, Nov-1996
// A prototype of the low energy neutron transport model.
// P. Arce, June-2014 Conversion neutron_hp to particle_hp
//

#include "G4ParticleHPWattSpectrum.hh"
#include "G4SystemOfUnits.hh"

  G4double G4ParticleHPWattSpectrum::Sample(G4double anEnergy) 
  {
    G4double a = theApar.GetY(anEnergy)*eV;
    G4double b = theBpar.GetY(anEnergy)/eV;
    G4double result;
    G4double random, cut, max;
    max = std::sinh(std::sqrt(b*15.*a));

    G4int icounter=0;
    G4int icounter_max=1024;
    do
    {
      icounter++;
      if ( icounter > icounter_max ) {
   G4cout << "Loop-counter exceeded the threshold value at " << __LINE__ << "th line of " << __FILE__ << "." << G4endl;
         break;
      }
      random = G4UniformRand();
      result = -a*G4Log(random);
      cut = G4UniformRand();
    }
    while(cut>std::sinh(std::sqrt(b*result))/max); // Loop checking, 11.05.2015, T. Koi
    return result;
  }