| 1 | //
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| 2 | // ********************************************************************
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| 3 | // * License and Disclaimer *
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| 4 | // * *
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| 5 | // * The Geant4 software is copyright of the Copyright Holders of *
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| 6 | // * the Geant4 Collaboration. It is provided under the terms and *
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| 7 | // * conditions of the Geant4 Software License, included in the file *
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| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These *
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| 9 | // * include a list of copyright holders. *
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| 10 | // * *
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| 11 | // * Neither the authors of this software system, nor their employing *
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| 12 | // * institutes,nor the agencies providing financial support for this *
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| 13 | // * work make any representation or warranty, express or implied, *
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| 14 | // * regarding this software system or assume any liability for its *
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| 15 | // * use. Please see the license in the file LICENSE and URL above *
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| 16 | // * for the full disclaimer and the limitation of liability. *
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| 17 | // * *
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| 18 | // * This code implementation is the result of the scientific and *
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| 19 | // * technical work of the GEANT4 collaboration. *
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| 20 | // * By using, copying, modifying or distributing the software (or *
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| 21 | // * any work based on the software) you agree to acknowledge its *
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| 22 | // * use in resulting scientific publications, and indicate your *
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| 23 | // * acceptance of all terms of the Geant4 Software license. *
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| 24 | // ********************************************************************
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| 25 | //
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| 26 | #ifndef G4NeutronHPThermalBoost_h
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| 27 | #define G4NeutronHPThermalBoost_h
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| 28 |
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| 29 | #include "G4HadProjectile.hh"
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| 30 | #include "G4Element.hh"
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| 31 | #include "G4ReactionProduct.hh"
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| 32 | #include "G4Nucleus.hh"
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| 33 | #include "G4NucleiPropertiesTable.hh"
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| 34 | #include "G4Electron.hh"
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| 35 | #include "G4Neutron.hh"
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| 36 |
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| 37 | class G4NeutronHPThermalBoost
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| 38 | {
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| 39 | public:
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| 40 | G4double GetThermalEnergy(const G4HadProjectile & aP,
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| 41 | const G4Element * anE,
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| 42 | G4double aT)
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| 43 | {
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| 44 | G4double theA = anE->GetN();
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| 45 | G4double theZ = anE->GetZ();
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| 46 | return GetThermalEnergy(aP, theA ,theZ, aT);
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| 47 | }
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| 48 |
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| 49 | G4double GetThermalEnergy(const G4HadProjectile & aP,
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| 50 | G4double theA, G4double theZ,
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| 51 | G4double aT)
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| 52 | {
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| 53 | // prepare neutron
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| 54 | G4double eKinetic = aP.GetKineticEnergy();
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| 55 | G4ReactionProduct theNeutron( const_cast<G4ParticleDefinition *>(aP.GetDefinition()) );
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| 56 | theNeutron.SetMomentum( aP.Get4Momentum().vect() );
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| 57 | theNeutron.SetKineticEnergy( eKinetic );
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| 58 | G4ThreeVector neuVelo = (1./aP.GetDefinition()->GetPDGMass())*theNeutron.GetMomentum();
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| 59 |
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| 60 | // prepare properly biased thermal nucleus
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| 61 | G4Nucleus aNuc;
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| 62 | G4double eps = 0.0001;
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| 63 | G4double eleMass;
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| 64 | eleMass = ( G4NucleiPropertiesTable::GetNuclearMass(static_cast<G4int>(theZ+eps), static_cast<G4int>(theA+eps))
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| 65 | ) / G4Neutron::Neutron()->GetPDGMass();
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| 66 |
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| 67 | G4ReactionProduct aThermalNuc = aNuc.GetBiasedThermalNucleus(eleMass, neuVelo, aT);
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| 68 |
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| 69 | // boost to rest system and return
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| 70 | G4ReactionProduct boosted;
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| 71 | boosted.Lorentz(theNeutron, aThermalNuc);
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| 72 | return boosted.GetKineticEnergy();
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| 73 | }
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| 74 | };
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| 75 | #endif
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