Gabriele Cosmo
309 lines
15 KiB
C++
309 lines
15 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: G4ECDecay.cc //
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// Author: D.H. Wright (SLAC) //
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// Date: 25 November 2014 //
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// //
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////////////////////////////////////////////////////////////////////////////////
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#include "G4ECDecay.hh"
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#include "G4IonTable.hh"
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#include "Randomize.hh"
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#include "G4ThreeVector.hh"
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#include "G4DynamicParticle.hh"
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#include "G4DecayProducts.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 "G4PhysicalConstants.hh"
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#include "G4SystemOfUnits.hh"
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G4ECDecay::G4ECDecay(const G4ParticleDefinition* theParentNucleus,
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const G4double& branch, const G4double& Qvalue,
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const G4double& excitationE,
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const G4Ions::G4FloatLevelBase& flb,
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const G4RadioactiveDecayMode& mode)
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: G4NuclearDecay("electron capture", mode, excitationE, flb), transitionQ(Qvalue),
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applyARM(true)
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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(2);
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G4IonTable* theIonTable =
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(G4IonTable*)(G4ParticleTable::GetParticleTable()->GetIonTable());
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G4int daughterZ = theParentNucleus->GetAtomicNumber() - 1;
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G4int daughterA = theParentNucleus->GetAtomicMass();
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SetDaughter(0, theIonTable->GetIon(daughterZ, daughterA, excitationE, flb) );
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SetDaughter(1, "nu_e");
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DefineSubshellProbabilities(daughterZ, daughterZ);
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}
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G4ECDecay::~G4ECDecay()
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{}
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G4DecayProducts* G4ECDecay::DecayIt(G4double)
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{
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// Fill G4MT_parent with theParentNucleus (stored by SetParent in ctor)
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CheckAndFillParent();
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// Fill G4MT_daughters with alpha and residual nucleus (stored by SetDaughter)
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CheckAndFillDaughters();
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// Get shell number of captured electron
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G4int shellIndex = -1;
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G4double ran;
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switch (theMode)
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{
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case KshellEC:
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shellIndex = 0;
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break;
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case LshellEC: // PL1+PL2+PL3=1
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ran=G4UniformRand();
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if (ran <= PL1) shellIndex =1;
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else if (ran<= (PL1+PL2)) shellIndex =2;
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else shellIndex =3;
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break;
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case MshellEC: // PM1+PM2+PM3=1
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ran=G4UniformRand();
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if (ran < PM1) shellIndex =4;
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else if (ran< (PM1+PM2)) shellIndex =5;
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else shellIndex = 6;
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break;
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case NshellEC: // PN1+PN2+PN3=1
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ran=G4UniformRand();
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if (ran < PN1) shellIndex = 9;
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else if (ran<= (PN1+PN2)) shellIndex =2;
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else shellIndex =10;
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break;
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default:
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G4Exception("G4ECDecay::DecayIt()", "HAD_RDM_009",
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FatalException, "Invalid electron shell selected");
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}
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// Initialize decay products with parent nucleus at rest
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G4DynamicParticle parentParticle(G4MT_parent, G4ThreeVector(0,0,0), 0.0);
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G4DecayProducts* products = new G4DecayProducts(parentParticle);
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G4double eBind = 0.0;
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// G4LossTableManager must already be initialized with G4UAtomicDeexcitation
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// This is currently done in G4RadioactiveDecay::BuildPhysicsTable
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G4VAtomDeexcitation* atomDeex =
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G4LossTableManager::Instance()->AtomDeexcitation();
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std::vector<G4DynamicParticle*> armProducts;
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if (applyARM) {
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if (atomDeex) {
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G4int aZ = G4MT_daughters[0]->GetAtomicNumber();
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G4int nShells = G4AtomicShells::GetNumberOfShells(aZ);
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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(aZ, as);
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eBind = shell->BindingEnergy();
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if (atomDeex->IsFluoActive() && aZ > 5 && aZ < 100) {
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// Do atomic relaxation
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// VI, SI
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// Allows fixing of Bugzilla 1727
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//const G4double deexLimit = 0.1*keV;
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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, aZ, deexLimit, deexLimit);
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}
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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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} // atomDeex
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} // applyARM
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G4double daughterMass = G4MT_daughters[0]->GetPDGMass();
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// CM momentum using Q value corrected for binding energy of captured electron
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G4double Q = transitionQ - eBind;
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G4double cmMomentum = Q*(Q + 2.*daughterMass)/(Q + daughterMass)/2.;
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G4double costheta = 2.*G4UniformRand() - 1.0;
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G4double sintheta = std::sqrt(1.0 - costheta*costheta);
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G4double phi = twopi*G4UniformRand()*rad;
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G4ThreeVector direction(sintheta*std::cos(phi),sintheta*std::sin(phi),
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costheta);
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G4double KE = cmMomentum;
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G4DynamicParticle* daughterParticle =
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new G4DynamicParticle(G4MT_daughters[1], direction, KE, 0.0);
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products->PushProducts(daughterParticle);
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KE = std::sqrt(cmMomentum*cmMomentum + daughterMass*daughterMass) - daughterMass;
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daughterParticle =
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new G4DynamicParticle(G4MT_daughters[0], -1.0*direction, KE, daughterMass);
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products->PushProducts(daughterParticle);
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G4int nArm = armProducts.size();
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if (nArm > 0) {
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G4ThreeVector bst = daughterParticle->Get4Momentum().boostVector();
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for (G4int 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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// 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 = (transitionQ - KEsum)/keV;
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G4cout << " EC check: Ediff (keV) = " << eCons << G4endl;
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*/
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return products;
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}
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void G4ECDecay::DumpNuclearInfo()
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{
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G4cout << " G4ECDecay of parent nucleus " << GetParentName() << " from ";
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if (theMode == 3) {
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G4cout << "K shell";
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} else if (theMode == 4) {
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G4cout << "L shell";
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} else if (theMode == 5) {
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G4cout << "M shell";
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}
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else if (theMode == 6) {
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G4cout << "N shell";
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}
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G4cout << G4endl;
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G4cout << " to " << GetDaughterName(0) << " + " << GetDaughterName(1)
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<< " with branching ratio " << GetBR() << "% and Q value "
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<< transitionQ << G4endl;
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}
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void G4ECDecay::DefineSubshellProbabilities(G4int Z, G4int )
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{ //Implementation for the case of allowed transitions
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//PL1+PL2=1. , PM1+PM2=1., PN1+PN2=1.
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PL1 = 1./(1+PL2overPL1[Z-1]);
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PL2 = PL1*PL2overPL1[Z-1];
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PM1 = 1./(1+PM2overPM1[Z-1]);
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PM2 = PM1*PM2overPM1[Z-1];
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PN1 = 1./(1+PN2overPN1[Z-1]);
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PN2 = PN1*PN2overPN1[Z-1];
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}
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////////////////////////////////////////////////////////////////////////////
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// Table of subshell ratio probability PL2/PL1 in function of Z
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// PL2/PL1 = (fL2/gL1)^2
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// with gL1 and fL2 the bound electron radial wave amplitudes taken from
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// Bambynek et al., Rev. Modern Physics, vol. 49, 1971, table IX
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// For Z=18 interpolation between Z=17 and Z=19 to avoid a jump in PL2/Pl1
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////////////////////////////////////////////////////////////////////////////
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const G4double G4ECDecay::PL2overPL1[100] = {
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0.0000e+00, 0.0000e+00, 0.0000e+00, 0.0000e+00, 0.0000e+00, 0.0000e+00, 1.8722e-04,
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2.6438e-04, 3.5456e-04, 4.5790e-04, 6.1588e-04, 7.8944e-04, 9.8530e-04, 1.2030e-03,
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1.4361e-03, 1.6886e-03, 1.9609e-03, 2.2641e-03, 2.5674e-03, 2.9019e-03, 3.2577e-03,
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3.6338e-03, 4.0310e-03, 4.4541e-03, 4.8943e-03, 5.3620e-03, 5.8523e-03, 6.3650e-03,
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6.9061e-03, 7.4607e-03, 8.0398e-03, 8.6417e-03, 9.2665e-03, 9.9150e-03, 1.0588e-02,
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1.1284e-02, 1.2004e-02, 1.2744e-02, 1.3518e-02, 1.4312e-02, 1.5136e-02, 1.5981e-02,
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1.6857e-02, 1.7764e-02, 1.8696e-02, 1.9682e-02, 2.0642e-02, 2.1661e-02, 2.2708e-02,
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2.3788e-02, 2.4896e-02, 2.6036e-02, 2.7217e-02, 2.8409e-02, 2.9646e-02, 3.0917e-02,
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3.2220e-02, 3.3561e-02, 3.4937e-02, 3.6353e-02, 3.7805e-02, 3.9297e-02, 4.0826e-02,
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4.2399e-02, 4.4010e-02, 4.5668e-02, 4.7368e-02, 4.9115e-02, 5.0896e-02, 5.2744e-02,
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5.4625e-02, 5.6565e-02, 5.8547e-02, 6.0593e-02, 6.2690e-02, 6.4844e-02, 6.7068e-02,
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6.9336e-02, 7.1667e-02, 7.4075e-02, 7.6544e-02, 7.9085e-02, 8.1688e-02, 8.4371e-02,
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8.7135e-02, 8.9995e-02, 9.2919e-02, 9.5949e-02, 9.9036e-02, 1.0226e-01, 1.0555e-01,
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1.0899e-01, 1.1249e-01, 1.1613e-01, 1.1989e-01, 1.2379e-01, 1.2780e-01, 1.3196e-01,
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1.3627e-01, 1.4071e-01};
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////////////////////////////////////////////////////////////////////////////
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// Table of subshell ratio probability PM2/PM1 in function of Z
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// PM2/PM1 = (fM2/gM1)^2
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// with gM1 and fM2 the bound electron radial wave amplitudes taken from
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// Bambynek et al., Rev. Modern Physics, vol. 49, 1971, table IX
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////////////////////////////////////////////////////////////////////////////
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const G4double G4ECDecay::PM2overPM1[100] = {
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0.0000e+00, 0.0000e+00, 0.0000e+00, 0.0000e+00, 0.0000e+00, 0.0000e+00, 0.0000e+00,
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0.0000e+00, 0.0000e+00, 0.0000e+00, 0.0000e+00, 0.0000e+00, 0.0000e+00, 0.0000e+00,
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1.0210e-03, 1.2641e-03, 1.5231e-03, 1.7990e-03, 2.1938e-03, 2.5863e-03, 2.9621e-03,
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3.3637e-03, 3.7909e-03, 4.2049e-03, 4.7021e-03, 5.1791e-03, 5.6766e-03, 6.1952e-03,
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6.7045e-03, 7.2997e-03, 7.9438e-03, 8.6271e-03, 9.3294e-03, 1.0058e-02, 1.0813e-02,
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1.1594e-02, 1.2408e-02, 1.3244e-02, 1.4118e-02, 1.5023e-02, 1.5962e-02, 1.6919e-02,
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1.7910e-02, 1.8934e-02, 1.9986e-02, 2.1072e-02, 2.2186e-02, 2.3336e-02, 2.4524e-02,
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2.5750e-02, 2.7006e-02, 2.8302e-02, 2.9629e-02, 3.0994e-02, 3.2399e-02, 3.3845e-02,
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3.5328e-02, 3.6852e-02, 3.8414e-02, 4.0025e-02, 4.1673e-02, 4.3368e-02, 4.5123e-02,
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4.6909e-02, 4.8767e-02, 5.0662e-02, 5.2612e-02, 5.4612e-02, 5.6662e-02, 5.8773e-02,
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6.0930e-02, 6.3141e-02, 6.5413e-02, 6.7752e-02, 7.0139e-02, 7.2603e-02, 7.5127e-02,
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7.7721e-02, 8.0408e-02, 8.3128e-02, 8.5949e-02, 8.8843e-02, 9.1824e-02, 9.4888e-02,
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9.8025e-02, 1.0130e-01, 1.0463e-01, 1.0806e-01, 1.1159e-01, 1.1526e-01, 1.1900e-01,
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1.2290e-01, 1.2688e-01, 1.3101e-01, 1.3528e-01, 1.3969e-01, 1.4425e-01, 1.4896e-01,
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1.5384e-01, 1.5887e-01};
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////////////////////////////////////////////////////////////////////////////
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// Table of subshell ratio probability PN2/PN1 in function of Z
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// PN2/PN1 = (fN2/gN1)^2
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// with gN1 and fN2 are the bound electron radial wave amplitude taken from
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// Bambynek et al., Rev. Modern Physics, vol. 49, 1971, table IX
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// For Z=44 interpolation between Z=43 and Z=45 to avoid a jump in PN2/PN1
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////////////////////////////////////////////////////////////////////////////
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const G4double G4ECDecay::PN2overPN1[100] = {
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0.0000e+00, 0.0000e+00, 0.0000e+00, 0.0000e+00, 0.0000e+00, 0.0000e+00, 0.0000e+00,
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0.0000e+00, 0.0000e+00, 0.0000e+00, 0.0000e+00, 0.0000e+00, 0.0000e+00, 0.0000e+00,
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0.0000e+00, 0.0000e+00, 0.0000e+00, 0.0000e+00, 0.0000e+00, 0.0000e+00, 0.0000e+00,
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0.0000e+00, 0.0000e+00, 0.0000e+00, 0.0000e+00, 0.0000e+00, 0.0000e+00, 0.0000e+00,
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0.0000e+00, 0.0000e+00, 0.0000e+00, 0.0000e+00, 0.0000e+00, 0.0000e+00, 0.0000e+00,
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0.0000e+00, 9.6988e-03, 1.0797e-02, 1.1706e-02, 1.2603e-02, 1.3408e-02, 1.4352e-02,
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1.5511e-02, 1.6579e-02, 1.7646e-02, 1.8731e-02, 1.9886e-02, 2.1069e-02, 2.2359e-02,
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2.3710e-02, 2.5058e-02, 2.6438e-02, 2.7843e-02, 2.9283e-02, 3.0762e-02, 3.2275e-02,
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3.3843e-02, 3.5377e-02, 3.6886e-02, 3.8502e-02, 4.0159e-02, 4.1867e-02, 4.3617e-02,
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4.5470e-02, 4.7247e-02, 4.9138e-02, 5.1065e-02, 5.3049e-02, 5.5085e-02, 5.7173e-02,
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5.9366e-02, 6.1800e-02, 6.3945e-02, 6.6333e-02, 6.8785e-02, 7.1303e-02, 7.3801e-02,
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7.6538e-02, 7.9276e-02, 8.2070e-02, 8.4959e-02, 8.7940e-02, 9.0990e-02, 9.4124e-02,
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9.7337e-02, 1.0069e-01, 1.0410e-01, 1.0761e-01, 1.1122e-01, 1.1499e-01, 1.1882e-01,
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1.2282e-01, 1.2709e-01, 1.3114e-01, 1.3549e-01, 1.4001e-01, 1.4465e-01, 1.4946e-01,
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1.5443e-01, 1.5954e-01};
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