Gabriele Cosmo
76 lines
3.2 KiB
C++
76 lines
3.2 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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#ifndef G4NeutronHPThermalBoost_h
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#define G4NeutronHPThermalBoost_h
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#include "G4HadProjectile.hh"
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#include "G4Element.hh"
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#include "G4ReactionProduct.hh"
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#include "G4Nucleus.hh"
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#include "G4NucleiPropertiesTable.hh"
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#include "G4Electron.hh"
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#include "G4Neutron.hh"
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class G4NeutronHPThermalBoost
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{
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public:
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G4double GetThermalEnergy(const G4HadProjectile & aP,
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const G4Element * anE,
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G4double aT)
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{
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G4double theA = anE->GetN();
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G4double theZ = anE->GetZ();
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return GetThermalEnergy(aP, theA ,theZ, aT);
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}
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G4double GetThermalEnergy(const G4HadProjectile & aP,
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G4double theA, G4double theZ,
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G4double aT)
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{
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// prepare neutron
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G4double eKinetic = aP.GetKineticEnergy();
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G4ReactionProduct theNeutron( const_cast<G4ParticleDefinition *>(aP.GetDefinition()) );
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theNeutron.SetMomentum( aP.Get4Momentum().vect() );
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theNeutron.SetKineticEnergy( eKinetic );
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G4ThreeVector neuVelo = (1./aP.GetDefinition()->GetPDGMass())*theNeutron.GetMomentum();
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// prepare properly biased thermal nucleus
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G4Nucleus aNuc;
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G4double eps = 0.0001;
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G4double eleMass;
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eleMass = ( G4NucleiPropertiesTable::GetNuclearMass(static_cast<G4int>(theZ+eps), static_cast<G4int>(theA+eps))
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) / G4Neutron::Neutron()->GetPDGMass();
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G4ReactionProduct aThermalNuc = aNuc.GetBiasedThermalNucleus(eleMass, neuVelo, aT);
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// boost to rest system and return
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G4ReactionProduct boosted;
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boosted.Lorentz(theNeutron, aThermalNuc);
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return boosted.GetKineticEnergy();
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}
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};
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#endif
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