G4ParticleHPProduct.cc

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//
// particle_hp -- source file
// J.P. Wellisch, Nov-1996
// A prototype of the low energy neutron transport model.
//
// 080718 As for secondary photons, if its mean value has a value of integer, 
//        then a sampling of multiplicity that based on Poisson Distribution 
//        is not carried out and the mean is used as a multiplicity.
//        modified by T. Koi.
// 080721 Using ClearHistories() methodl for limiting the sum of secondary energies
//        modified by T. Koi.
// 080901 bug fix of too many secnodaries production in nd reactinos by T. Koi
//
// P. Arce, June-2014 Conversion neutron_hp to particle_hp
//
#include "G4ParticleHPProduct.hh" 
#include "G4Poisson.hh"
#include "G4Proton.hh"
#include "G4HadronicParameters.hh"
 
G4int G4ParticleHPProduct::GetMultiplicity(G4double anEnergy )
{
  if ( theDist == 0 ) { 
     fCache.Get().theCurrentMultiplicity = 0;
     return 0; 
  }
 
  G4double mean = theYield.GetY(anEnergy);
  if ( mean <= 0. )  {
     fCache.Get().theCurrentMultiplicity = 0;
     return 0; 
  }
 
  G4int multi;
  multi = G4int(mean+0.0001);
#ifdef PHP_AS_HP
  if ( theMassCode == 0 ) // DELETE THIS: IT MUST BE DONE FOR ALL PARTICLES
#endif
  { 
     if ( G4int ( mean ) == mean )
     {
        multi = (G4int) mean;
     }
     else
     {
#ifdef PHP_AS_HP
     multi = G4Poisson ( mean ); 
#else 
       if( theMultiplicityMethod == G4HPMultiPoisson )
       {
     multi = (G4int)G4Poisson ( mean );
       }
       else
       {
     G4double radnf = CLHEP::RandFlat::shoot();
     G4int imulti = G4int(mean);
     multi = imulti + G4int(radnf < mean-imulti);
       }
#endif
     }
#ifdef G4PHPDEBUG
     #ifdef G4VERBOSE
     if( std::getenv("G4ParticleHPDebug") && G4HadronicParameters::Instance()->GetVerboseLevel() > 0 )
       G4cout << "G4ParticleHPProduct::GetMultiplicity " << theMassCode
              << " " << theMass << " multi " << multi << " mean " << mean
              << G4endl;
     #endif
#endif
  }
 
  fCache.Get().theCurrentMultiplicity = static_cast<G4int>(mean);
 
  return multi;
}
 
 
G4ReactionProductVector * G4ParticleHPProduct::Sample(G4double anEnergy, G4int multi)
{
  if(theDist == 0) { return nullptr; }
  G4ReactionProductVector * result = new G4ReactionProductVector;
 
  theDist->SetTarget(fCache.Get().theTarget);
  theDist->SetProjectileRP(fCache.Get().theProjectileRP);
  G4int i;
  G4ReactionProduct * tmp;
  theDist->ClearHistories();
 
  for(i=0; i<multi; ++i)
  {
#ifdef G4PHPDEBUG
 
#endif
    tmp = theDist->Sample(anEnergy, theMassCode, theMass);
    if(tmp != 0) { result->push_back(tmp); }
#ifndef G4PHPDEBUG //GDEB
    #ifdef G4VERBOSE
    if( std::getenv("G4ParticleHPDebug")
     && tmp != 0 && G4HadronicParameters::Instance()->GetVerboseLevel() > 0 )
      G4cout << multi << " " << i << " @@@ G4ParticleHPProduct::Sample "
             << tmp->GetDefinition()->GetParticleName() << " E= "
             << tmp->GetKineticEnergy() << G4endl;
    #endif
#endif
  }
  if(multi == 0) 
    {
      tmp = theDist->Sample(anEnergy, theMassCode, theMass);
      delete tmp;
    }
 
  return result;
}