Geant4 Cross Reference

Cross-Referencing   Geant4
Geant4/processes/hadronic/models/particle_hp/src/G4ParticleHPWattSpectrum.cc

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 25 //
 26 // neutron_hp -- source file
 27 // J.P. Wellisch, Nov-1996
 28 // A prototype of the low energy neutron transport model.
 29 // P. Arce, June-2014 Conversion neutron_hp to particle_hp
 30 //
 31 
 32 #include "G4ParticleHPWattSpectrum.hh"
 33 
 34 #include "G4SystemOfUnits.hh"
 35 
 36 G4double G4ParticleHPWattSpectrum::Sample(G4double anEnergy)
 37 {
 38   G4double a = theApar.GetY(anEnergy) * eV;
 39   G4double b = theBpar.GetY(anEnergy) / eV;
 40   G4double result = 0.;
 41   G4double random, cut, max;
 42   max = std::sinh(std::sqrt(b * 15. * a));
 43 
 44   G4int icounter = 0;
 45   G4int icounter_max = 1024;
 46   do {
 47     icounter++;
 48     if (icounter > icounter_max) {
 49       G4cout << "Loop-counter exceeded the threshold value at " << __LINE__ << "th line of "
 50              << __FILE__ << "." << G4endl;
 51       break;
 52     }
 53     random = G4UniformRand();
 54     result = -a * G4Log(random);
 55     cut = G4UniformRand();
 56   } while (cut > std::sinh(std::sqrt(b * result)) / max);  // Loop checking, 11.05.2015, T. Koi
 57   return result;
 58 }
 59