G4ParticleHPIsotropic.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 "G4ParticleHPIsotropic.hh"
 
#include "G4Alpha.hh"
#include "G4Deuteron.hh"
#include "G4Electron.hh"
#include "G4Gamma.hh"
#include "G4He3.hh"
#include "G4IonTable.hh"
#include "G4Neutron.hh"
#include "G4PhysicalConstants.hh"
#include "G4Positron.hh"
#include "G4Proton.hh"
#include "G4SystemOfUnits.hh"
#include "G4Triton.hh"
#include "Randomize.hh"
 
void G4ParticleHPIsotropic::Init(std::istream&) {}
 
G4ReactionProduct* G4ParticleHPIsotropic::Sample(G4double anEnergy, G4double massCode, G4double)
{
  auto result = new G4ReactionProduct;
  auto Z = static_cast<G4int>(massCode / 1000);
  auto A = static_cast<G4int>(massCode - 1000 * Z);
 
  if (massCode == 0) {
    result->SetDefinition(G4Gamma::Gamma());
  }
  else if (A == 0) {
    result->SetDefinition(G4Electron::Electron());
    if (Z == 1) result->SetDefinition(G4Positron::Positron());
  }
  else if (A == 1) {
    result->SetDefinition(G4Neutron::Neutron());
    if (Z == 1) result->SetDefinition(G4Proton::Proton());
  }
  else if (A == 2) {
    result->SetDefinition(G4Deuteron::Deuteron());
  }
  else if (A == 3) {
    result->SetDefinition(G4Triton::Triton());
    if (Z == 2) result->SetDefinition(G4He3::He3());
  }
  else if (A == 4) {
    result->SetDefinition(G4Alpha::Alpha());
    // 110607 TK modified following parts for migration to G4NDL3.15 (ENDF VII.r0)
    // if(Z!=2) throw G4HadronicException(__FILE__, __LINE__, "Unknown ion case 1");
    if (Z != 2) {
      result->SetDefinition(G4IonTable::GetIonTable()->GetIon(Z, A, 0.0));
    }
  }
  else {
    // 110607 TK modified following parts for migration to G4NDL3.15 (ENDF VII.r0)
    result->SetDefinition(G4IonTable::GetIonTable()->GetIon(Z, A, 0.0));
    // throw G4HadronicException(__FILE__, __LINE__, "G4ParticleHPIsotropic: Unknown ion case 2");
  }
 
  // Bug #1745 DHW G4double cosTh = G4UniformRand();
  G4double cosTh = 2. * G4UniformRand() - 1.;
  G4double phi = twopi * G4UniformRand();
  G4double theta = std::acos(cosTh);
  G4double sinth = std::sin(theta);
 
  // we need the the Q value of the reaction
  result->SetKineticEnergy(std::max(0.001 * MeV, anEnergy + GetQValue()));
  G4double mtot = result->GetTotalMomentum();
  G4ThreeVector tempVector(mtot * sinth * std::cos(phi), mtot * sinth * std::sin(phi),
                           mtot * cosTh);
  result->SetMomentum(tempVector);
 
  return result;
}