Gabriele Cosmo
74 lines
3.0 KiB
C++
74 lines
3.0 KiB
C++
//
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// ********************************************************************
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// * DISCLAIMER *
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// * *
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// * The following disclaimer summarizes all the specific disclaimers *
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// * of contributors to this software. The specific disclaimers,which *
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// * govern, are listed with their locations in: *
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// * http://cern.ch/geant4/license *
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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. *
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// * *
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// * This code implementation is the intellectual property of the *
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// * GEANT4 collaboration. *
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// * By copying, distributing or modifying the Program (or any work *
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// * based on the Program) you indicate your acceptance of this *
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// * statement, and all its terms. *
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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 "G4DynamicParticle.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 G4DynamicParticle * 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 G4DynamicParticle * 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( aP->GetDefinition() );
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theNeutron.SetMomentum( aP->GetMomentum() );
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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::GetAtomicMass(static_cast<G4int>(theZ+eps), static_cast<G4int>(theA+eps))-
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theZ*G4Electron::ElectronDefinition()->GetPDGMass()
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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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