G4ParticleHPNucLevel.cc

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// V. Ivanchenko, 21 April 2023 Data structure class for gamma levels
//
 
#include "G4ParticleHPNucLevel.hh"
 
#include "G4Gamma.hh"
#include "G4RandomDirection.hh"
#include "Randomize.hh"
 
G4ParticleHPNucLevel::G4ParticleHPNucLevel(G4double e) : levelEnergy(e) {}
 
void G4ParticleHPNucLevel::AddGamma(G4double e, G4double w, G4int idx)
{
  gammaData x;
  x.gammaEnergy = e;
  x.cumProbability = w;
  x.next = idx;
  gammas.push_back(x);
  ++nGammas;
}
 
void G4ParticleHPNucLevel::Normalize()
{
  if (gammas.empty()) {
    return;
  }
  G4double sum = 0.0;
  for (auto& gam : gammas) {
    sum += gam.cumProbability;
  }
  if (sum <= 0.0) {
    return;
  }
 
  G4double norm = 1.0 / sum;
  sum = 0;
  for (auto& gam : gammas) {
    sum += norm * gam.cumProbability;
    gam.cumProbability = sum;
  }
  gammas[nGammas - 1].cumProbability = 1.0;
}
 
G4ReactionProduct* G4ParticleHPNucLevel::GetDecayGamma(G4int& idx) const
{
  if (gammas.empty()) {
    return nullptr;
  }
  G4double q = G4UniformRand();
  G4double e = 0.0;
  for (auto& gam : gammas) {
    if (q <= gam.cumProbability) {
      e = gam.gammaEnergy;
      idx = gam.next;
      break;
    }
  }
  if (e <= 0.0) {
    return nullptr;
  }
  G4ThreeVector p = G4RandomDirection();
  p *= e;
  auto res = new G4ReactionProduct(G4Gamma::Gamma());
  res->SetMomentum(p);
  res->SetKineticEnergy(e);
  return res;
}