Gabriele Cosmo
93 lines
3.0 KiB
C++
93 lines
3.0 KiB
C++
//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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// V. Ivanchenko, 21 April 2023 Data structure class for gamma levels
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//
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#include "G4ParticleHPNucLevel.hh"
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#include "G4Gamma.hh"
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#include "G4RandomDirection.hh"
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#include "Randomize.hh"
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G4ParticleHPNucLevel::G4ParticleHPNucLevel(G4double e) : levelEnergy(e) {}
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void G4ParticleHPNucLevel::AddGamma(G4double e, G4double w, G4int idx)
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{
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gammaData x;
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x.gammaEnergy = e;
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x.cumProbability = w;
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x.next = idx;
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gammas.push_back(x);
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++nGammas;
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}
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void G4ParticleHPNucLevel::Normalize()
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{
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if (gammas.empty()) {
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return;
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}
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G4double sum = 0.0;
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for (auto& gam : gammas) {
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sum += gam.cumProbability;
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}
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if (sum <= 0.0) {
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return;
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}
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G4double norm = 1.0 / sum;
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sum = 0;
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for (auto& gam : gammas) {
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sum += norm * gam.cumProbability;
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gam.cumProbability = sum;
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}
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gammas[nGammas - 1].cumProbability = 1.0;
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}
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G4ReactionProduct* G4ParticleHPNucLevel::GetDecayGamma(G4int& idx) const
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{
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if (gammas.empty()) {
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return nullptr;
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}
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G4double q = G4UniformRand();
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G4double e = 0.0;
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for (auto& gam : gammas) {
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if (q <= gam.cumProbability) {
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e = gam.gammaEnergy;
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idx = gam.next;
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break;
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}
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}
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if (e <= 0.0) {
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return nullptr;
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}
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G4ThreeVector p = G4RandomDirection();
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p *= e;
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auto res = new G4ReactionProduct(G4Gamma::Gamma());
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res->SetMomentum(p);
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res->SetKineticEnergy(e);
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return res;
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}
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