Geant4 Cross Reference

Cross-Referencing   Geant4
Geant4/processes/hadronic/models/particle_hp/src/G4ParticleHPNucLevel.cc

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 25 //
 26 // V. Ivanchenko, 21 April 2023 Data structure class for gamma levels
 27 //
 28 
 29 #include "G4ParticleHPNucLevel.hh"
 30 
 31 #include "G4Gamma.hh"
 32 #include "G4RandomDirection.hh"
 33 #include "Randomize.hh"
 34 
 35 G4ParticleHPNucLevel::G4ParticleHPNucLevel(G4double e) : levelEnergy(e) {}
 36 
 37 void G4ParticleHPNucLevel::AddGamma(G4double e, G4double w, G4int idx)
 38 {
 39   gammaData x;
 40   x.gammaEnergy = e;
 41   x.cumProbability = w;
 42   x.next = idx;
 43   gammas.push_back(x);
 44   ++nGammas;
 45 }
 46 
 47 void G4ParticleHPNucLevel::Normalize()
 48 {
 49   if (gammas.empty()) {
 50     return;
 51   }
 52   G4double sum = 0.0;
 53   for (auto& gam : gammas) {
 54     sum += gam.cumProbability;
 55   }
 56   if (sum <= 0.0) {
 57     return;
 58   }
 59 
 60   G4double norm = 1.0 / sum;
 61   sum = 0;
 62   for (auto& gam : gammas) {
 63     sum += norm * gam.cumProbability;
 64     gam.cumProbability = sum;
 65   }
 66   gammas[nGammas - 1].cumProbability = 1.0;
 67 }
 68 
 69 G4ReactionProduct* G4ParticleHPNucLevel::GetDecayGamma(G4int& idx) const
 70 {
 71   if (gammas.empty()) {
 72     return nullptr;
 73   }
 74   G4double q = G4UniformRand();
 75   G4double e = 0.0;
 76   for (auto& gam : gammas) {
 77     if (q <= gam.cumProbability) {
 78       e = gam.gammaEnergy;
 79       idx = gam.next;
 80       break;
 81     }
 82   }
 83   if (e <= 0.0) {
 84     return nullptr;
 85   }
 86   G4ThreeVector p = G4RandomDirection();
 87   p *= e;
 88   auto res = new G4ReactionProduct(G4Gamma::Gamma());
 89   res->SetMomentum(p);
 90   res->SetKineticEnergy(e);
 91   return res;
 92 }
 93