Gabriele Cosmo
285 lines
11 KiB
C++
285 lines
11 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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// neutron_hp -- source file
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// J.P. Wellisch, Nov-1996
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// A prototype of the low energy neutron transport model.
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//
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// 12-Apr-06 fix in delayed neutron and photon emission without FS data by T. Koi
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// 07-Sep-11 M. Kelsey -- Follow change to G4HadFinalState interface
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// P. Arce, June-2014 Conversion neutron_hp to particle_hp
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//
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#include "G4ParticleHPFissionFS.hh"
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#include "G4DynamicParticleVector.hh"
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#include "G4Exp.hh"
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#include "G4IonTable.hh"
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#include "G4Nucleus.hh"
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#include "G4ParticleHPFissionERelease.hh"
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#include "G4PhysicalConstants.hh"
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#include "G4PhysicsModelCatalog.hh"
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G4ParticleHPFissionFS::G4ParticleHPFissionFS()
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{
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secID = G4PhysicsModelCatalog::GetModelID("model_NeutronHPFission");
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hasXsec = false;
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produceFissionFragments = false;
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}
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void G4ParticleHPFissionFS::Init(G4double A, G4double Z, G4int M, const G4String& dirName,
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const G4String& aFSType, G4ParticleDefinition* projectile)
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{
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theFS.Init(A, Z, M, dirName, aFSType, projectile);
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theFC.Init(A, Z, M, dirName, aFSType, projectile);
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theSC.Init(A, Z, M, dirName, aFSType, projectile);
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theTC.Init(A, Z, M, dirName, aFSType, projectile);
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theLC.Init(A, Z, M, dirName, aFSType, projectile);
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theFF.Init(A, Z, M, dirName, aFSType, projectile);
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if (G4ParticleHPManager::GetInstance()->GetProduceFissionFragments() && theFF.HasFSData()) {
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G4cout << "Fission fragment production is now activated in HP package for "
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<< "Z = " << (G4int)Z << ", A = " << (G4int)A << G4endl;
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G4cout << "As currently modeled this option precludes production of delayed neutrons from "
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"fission fragments."
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<< G4endl;
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produceFissionFragments = true;
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}
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}
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G4HadFinalState* G4ParticleHPFissionFS::ApplyYourself(const G4HadProjectile& theTrack)
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{
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// Because it may change by UI command
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produceFissionFragments = G4ParticleHPManager::GetInstance()->GetProduceFissionFragments();
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// prepare neutron
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if (theResult.Get() == nullptr) theResult.Put(new G4HadFinalState);
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theResult.Get()->Clear();
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G4double eKinetic = theTrack.GetKineticEnergy();
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const G4HadProjectile* incidentParticle = &theTrack;
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G4ReactionProduct theNeutron(
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const_cast<G4ParticleDefinition*>(incidentParticle->GetDefinition()));
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theNeutron.SetMomentum(incidentParticle->Get4Momentum().vect());
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theNeutron.SetKineticEnergy(eKinetic);
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// prepare target
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G4Nucleus aNucleus;
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G4ReactionProduct theTarget;
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G4double targetMass = theFS.GetMass();
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G4ThreeVector neuVelo =
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(1. / incidentParticle->GetDefinition()->GetPDGMass()) * theNeutron.GetMomentum();
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theTarget =
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aNucleus.GetBiasedThermalNucleus(targetMass, neuVelo, theTrack.GetMaterial()->GetTemperature());
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theTarget.SetDefinition(
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G4IonTable::GetIonTable()->GetIon(G4int(theBaseZ), G4int(theBaseA), 0.0)); // TESTPHP
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// set neutron and target in the FS classes
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theFS.SetNeutronRP(theNeutron);
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theFS.SetTarget(theTarget);
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theFC.SetNeutronRP(theNeutron);
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theFC.SetTarget(theTarget);
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theSC.SetNeutronRP(theNeutron);
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theSC.SetTarget(theTarget);
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theTC.SetNeutronRP(theNeutron);
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theTC.SetTarget(theTarget);
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theLC.SetNeutronRP(theNeutron);
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theLC.SetTarget(theTarget);
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theFF.SetNeutronRP(theNeutron);
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theFF.SetTarget(theTarget);
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// boost to target rest system and decide on channel.
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theNeutron.Lorentz(theNeutron, -1 * theTarget);
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// dice the photons
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G4DynamicParticleVector* thePhotons;
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thePhotons = theFS.GetPhotons();
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// select the FS in charge
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eKinetic = theNeutron.GetKineticEnergy();
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G4double xSec[4];
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xSec[0] = theFC.GetXsec(eKinetic);
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xSec[1] = xSec[0] + theSC.GetXsec(eKinetic);
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xSec[2] = xSec[1] + theTC.GetXsec(eKinetic);
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xSec[3] = xSec[2] + theLC.GetXsec(eKinetic);
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G4int it;
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unsigned int i = 0;
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G4double random = G4UniformRand();
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if (xSec[3] == 0) {
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it = -1;
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}
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else {
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for (i = 0; i < 4; i++) {
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it = i;
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if (random < xSec[i] / xSec[3]) break;
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}
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}
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// dice neutron multiplicities, energies and momenta in Lab. @@
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// no energy conservation on an event-to-event basis. we rely on the data to be ok. @@
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// also for mean, we rely on the consistancy of the data. @@
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G4int Prompt = 0, delayed = 0, all = 0;
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G4DynamicParticleVector* theNeutrons = nullptr;
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switch (it) // check logic, and ask, if partials can be assumed to correspond to individual
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// particles @@@
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{
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case 0:
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theFS.SampleNeutronMult(all, Prompt, delayed, eKinetic, 0);
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if (Prompt == 0 && delayed == 0) Prompt = all;
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theNeutrons = theFC.ApplyYourself(Prompt); // delayed always in FS
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// take 'U' into account explicitly (see 5.4) in the sampling of energy @@@@
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break;
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case 1:
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theFS.SampleNeutronMult(all, Prompt, delayed, eKinetic, 1);
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if (Prompt == 0 && delayed == 0) Prompt = all;
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theNeutrons = theSC.ApplyYourself(Prompt); // delayed always in FS, off done in FSFissionFS
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break;
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case 2:
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theFS.SampleNeutronMult(all, Prompt, delayed, eKinetic, 2);
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if (Prompt == 0 && delayed == 0) Prompt = all;
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theNeutrons = theTC.ApplyYourself(Prompt); // delayed always in FS
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break;
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case 3:
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theFS.SampleNeutronMult(all, Prompt, delayed, eKinetic, 3);
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if (Prompt == 0 && delayed == 0) Prompt = all;
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theNeutrons = theLC.ApplyYourself(Prompt); // delayed always in FS
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break;
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default:
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break;
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}
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// dice delayed neutrons and photons, and fallback
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// for Prompt in case channel had no FS data; add all paricles to FS.
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if (produceFissionFragments) delayed = 0;
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G4double* theDecayConstants;
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if (theNeutrons != nullptr) {
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theDecayConstants = new G4double[delayed];
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for (i = 0; i < theNeutrons->size(); ++i) {
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theResult.Get()->AddSecondary(theNeutrons->operator[](i), secID);
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}
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delete theNeutrons;
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G4DynamicParticleVector* theDelayed = nullptr;
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theDelayed = theFS.ApplyYourself(0, delayed, theDecayConstants);
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for (i = 0; i < theDelayed->size(); i++) {
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G4double time = -G4Log(G4UniformRand()) / theDecayConstants[i];
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time += theTrack.GetGlobalTime();
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theResult.Get()->AddSecondary(theDelayed->operator[](i), secID);
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theResult.Get()->GetSecondary(theResult.Get()->GetNumberOfSecondaries() - 1)->SetTime(time);
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}
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delete theDelayed;
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}
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else {
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theFS.SampleNeutronMult(all, Prompt, delayed, eKinetic, 0);
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theDecayConstants = new G4double[delayed];
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if (Prompt == 0 && delayed == 0) Prompt = all;
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theNeutrons = theFS.ApplyYourself(Prompt, delayed, theDecayConstants);
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G4int i0;
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for (i0 = 0; i0 < Prompt; ++i0) {
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theResult.Get()->AddSecondary(theNeutrons->operator[](i0), secID);
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}
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for (i0 = Prompt; i0 < Prompt + delayed; ++i0) {
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// Protect against the very rare case of division by zero
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G4double time = 0.0;
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if (theDecayConstants[i0 - Prompt] > 1.0e-30) {
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time = -G4Log(G4UniformRand()) / theDecayConstants[i0 - Prompt];
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}
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else {
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G4ExceptionDescription ed;
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ed << " theDecayConstants[i0-Prompt]=" << theDecayConstants[i0 - Prompt]
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<< " -> cannot sample the time : set it to 0.0 !" << G4endl;
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G4Exception("G4ParticleHPFissionFS::ApplyYourself ", "HAD_FISSIONHP_001", JustWarning, ed);
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}
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time += theTrack.GetGlobalTime();
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theResult.Get()->AddSecondary(theNeutrons->operator[](i0), secID);
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theResult.Get()->GetSecondary(theResult.Get()->GetNumberOfSecondaries() - 1)->SetTime(time);
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}
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delete theNeutrons;
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}
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delete[] theDecayConstants;
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std::size_t nPhotons = 0;
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if (thePhotons != nullptr) {
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nPhotons = thePhotons->size();
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for (i = 0; i < nPhotons; ++i) {
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theResult.Get()->AddSecondary(thePhotons->operator[](i), secID);
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}
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delete thePhotons;
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}
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// finally deal with local energy depositions.
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G4ParticleHPFissionERelease* theERelease = theFS.GetEnergyRelease();
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G4double eDepByFragments = theERelease->GetFragmentKinetic();
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// theResult.SetLocalEnergyDeposit(eDepByFragments);
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if (!produceFissionFragments) theResult.Get()->SetLocalEnergyDeposit(eDepByFragments);
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// clean up the primary neutron
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theResult.Get()->SetStatusChange(stopAndKill);
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if (produceFissionFragments) {
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G4int fragA_Z = 0;
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G4int fragA_A = 0;
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G4int fragA_M = 0;
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// System is traget rest!
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theFF.GetAFissionFragment(eKinetic, fragA_Z, fragA_A, fragA_M);
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if (0 == fragA_A) { return theResult.Get(); }
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G4int fragB_Z = (G4int)theBaseZ - fragA_Z;
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G4int fragB_A = (G4int)theBaseA - fragA_A - Prompt;
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G4IonTable* pt = G4IonTable::GetIonTable();
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// Excitation energy is not taken into account
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G4ParticleDefinition* pdA = pt->GetIon(fragA_Z, fragA_A, 0.0);
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G4ParticleDefinition* pdB = pt->GetIon(fragB_Z, fragB_A, 0.0);
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// Isotropic Distribution
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G4double phi = twopi * G4UniformRand();
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// Bug #1745 DHW G4double theta = pi*G4UniformRand();
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G4double costheta = 2. * G4UniformRand() - 1.;
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G4double theta = std::acos(costheta);
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G4double sinth = std::sin(theta);
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G4ThreeVector direction(sinth * std::cos(phi), sinth * std::sin(phi), costheta);
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// Just use ENDF value for this
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G4double ER = eDepByFragments;
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G4double ma = pdA->GetPDGMass();
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G4double mb = pdB->GetPDGMass();
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G4double EA = ER / (1 + ma / mb);
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G4double EB = ER - EA;
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auto dpA = new G4DynamicParticle(pdA, direction, EA);
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auto dpB = new G4DynamicParticle(pdB, -direction, EB);
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theResult.Get()->AddSecondary(dpA, secID);
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theResult.Get()->AddSecondary(dpB, secID);
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}
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return theResult.Get();
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}
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