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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