Gabriele Cosmo
185 lines
7.6 KiB
C++
185 lines
7.6 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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////////////////////////////////////////////////////////////////////////////////
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// //
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// File: G4ITDecay.cc //
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// Author: D.H. Wright (SLAC) //
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// Date: 14 November 2014 //
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// //
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////////////////////////////////////////////////////////////////////////////////
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#include "G4ITDecay.hh"
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#include "G4IonTable.hh"
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#include "G4ThreeVector.hh"
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#include "G4LorentzVector.hh"
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#include "G4DynamicParticle.hh"
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#include "G4DecayProducts.hh"
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#include "G4PhotonEvaporation.hh"
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#include "G4VAtomDeexcitation.hh"
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#include "G4AtomicShells.hh"
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#include "G4Electron.hh"
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#include "G4LossTableManager.hh"
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#include "G4Fragment.hh"
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#include "G4SystemOfUnits.hh"
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#include "G4PhysicalConstants.hh"
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G4ITDecay::G4ITDecay(G4PhotonEvaporation* ptr)
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: G4NuclearDecay("IT decay", IT, 0.0, noFloat), photonEvaporation(ptr)
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{}
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G4ITDecay::G4ITDecay(const G4ParticleDefinition* theParentNucleus,
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const G4double& branch, const G4double&,
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const G4double& excitationE)
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: G4NuclearDecay("IT decay", IT, excitationE, noFloat)
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{
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SetParent(theParentNucleus); // Store name of parent nucleus, delete G4MT_parent
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SetBR(branch);
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SetNumberOfDaughters(1);
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SetDaughter(0, theParentNucleus);
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SetupDecay(theParentNucleus);
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}
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void G4ITDecay::SetupDecay(const G4ParticleDefinition* theParentNucleus)
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{
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theParent = theParentNucleus;
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parentZ = theParentNucleus->GetAtomicNumber();
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parentA = theParentNucleus->GetAtomicMass();
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}
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G4DecayProducts* G4ITDecay::DecayIt(G4double)
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{
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// Set up final state
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// parentParticle is set at rest here because boost with correct momentum
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// is done later
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G4LorentzVector atRest(theParent->GetPDGMass(), G4ThreeVector(0.,0.,0.) );
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G4DynamicParticle parentParticle(theParent, atRest);
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G4DecayProducts* products = new G4DecayProducts(parentParticle);
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// Let G4PhotonEvaporation do the decay
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G4Fragment parentNucleus(parentA, parentZ, atRest);
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// one emission, parent nucleaus become less excited
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G4Fragment* eOrGamma = photonEvaporation->EmittedFragment(&parentNucleus);
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// Modified nuclide is returned as dynDaughter
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auto theIonTable = G4ParticleTable::GetParticleTable()->GetIonTable();
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G4ParticleDefinition* daughterIon =
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theIonTable->GetIon(parentZ, parentA, parentNucleus.GetExcitationEnergy(),
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G4Ions::FloatLevelBase(parentNucleus.GetFloatingLevelNumber()));
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G4DynamicParticle* dynDaughter = new G4DynamicParticle(daughterIon,
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parentNucleus.GetMomentum());
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if (nullptr != eOrGamma) {
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G4DynamicParticle* eOrGammaDyn =
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new G4DynamicParticle(eOrGamma->GetParticleDefinition(),
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eOrGamma->GetMomentum() );
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eOrGammaDyn->SetProperTime(eOrGamma->GetCreationTime() );
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products->PushProducts(eOrGammaDyn);
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delete eOrGamma;
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// Now do atomic relaxation if e- is emitted
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if (applyARM) {
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G4int shellIndex = photonEvaporation->GetVacantShellNumber();
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if (shellIndex > -1) {
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G4VAtomDeexcitation* atomDeex =
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G4LossTableManager::Instance()->AtomDeexcitation();
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if (atomDeex->IsFluoActive() && parentZ > 5 && parentZ < 105) {
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G4int nShells = G4AtomicShells::GetNumberOfShells(parentZ);
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if (shellIndex >= nShells) shellIndex = nShells;
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G4AtomicShellEnumerator as = G4AtomicShellEnumerator(shellIndex);
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const G4AtomicShell* shell = atomDeex->GetAtomicShell(parentZ, as);
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std::vector<G4DynamicParticle*> armProducts;
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// VI, SI
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// Allows fixing of Bugzilla 1727
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G4double deexLimit = 0.1*keV;
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if (G4EmParameters::Instance()->DeexcitationIgnoreCut()) deexLimit =0.;
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//
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atomDeex->GenerateParticles(&armProducts, shell, parentZ, deexLimit,
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deexLimit);
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G4double productEnergy = 0.;
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for (G4int i = 0; i < G4int(armProducts.size()); i++)
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productEnergy += armProducts[i]->GetKineticEnergy();
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G4double deficit = shell->BindingEnergy() - productEnergy;
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if (deficit > 0.0) {
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// Add a dummy electron to make up extra energy
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G4double cosTh = 1.-2.*G4UniformRand();
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G4double sinTh = std::sqrt(1.- cosTh*cosTh);
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G4double phi = twopi*G4UniformRand();
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G4ThreeVector electronDirection(sinTh*std::sin(phi),
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sinTh*std::cos(phi), cosTh);
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G4DynamicParticle* extra =
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new G4DynamicParticle(G4Electron::Electron(), electronDirection,
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deficit);
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armProducts.push_back(extra);
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}
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std::size_t nArm = armProducts.size();
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if (nArm > 0) {
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G4ThreeVector bst = dynDaughter->Get4Momentum().boostVector();
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for (std::size_t i = 0; i < nArm; ++i) {
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G4DynamicParticle* dp = armProducts[i];
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G4LorentzVector lv = dp->Get4Momentum().boost(bst);
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dp->Set4Momentum(lv);
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products->PushProducts(dp);
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}
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}
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}
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}
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} // if ARM on
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} // eOrGamma
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products->PushProducts(dynDaughter);
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// Energy conservation check
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/*
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G4int newSize = products->entries();
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G4DynamicParticle* temp = 0;
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G4double KEsum = 0.0;
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for (G4int i = 0; i < newSize; i++) {
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temp = products->operator[](i);
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KEsum += temp->GetKineticEnergy();
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}
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G4double eCons = G4MT_parent->GetPDGMass() - dynDaughter->GetMass() - KEsum;
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G4cout << " IT check: Ediff (keV) = " << eCons/keV << G4endl;
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*/
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return products;
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}
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void G4ITDecay::DumpNuclearInfo()
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{
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if (theParent != nullptr) {
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G4cout << " G4ITDecay for parent nucleus " << theParent->GetParticleName() << G4endl;
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}
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}
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