Gabriele Cosmo
118 lines
3.8 KiB
C++
118 lines
3.8 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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//
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//
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// Geant4 Header : G4NeutronElectronElModel
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//
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// 16.5.17 V.Grichine
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//
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// Modified:
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//
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// Class Description
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// Default model for neutron-electron elastic scattering;
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// Class Description - End
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#ifndef G4NeutronElectronElModel_h
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#define G4NeutronElectronElModel_h 1
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#include "globals.hh"
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#include "G4HadronElastic.hh"
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#include "G4HadProjectile.hh"
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#include "G4Nucleus.hh"
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#include "G4NucleiProperties.hh"
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class G4ParticleDefinition;
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class G4PhysicsLogVector;
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class G4PhysicsTable;
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class G4NeutronElectronElModel : public G4HadronElastic
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{
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public:
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G4NeutronElectronElModel(const G4String& name = "n-e-elastic");
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virtual ~G4NeutronElectronElModel();
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virtual G4bool IsApplicable(const G4HadProjectile & aTrack,
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G4Nucleus & targetNucleus);
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virtual G4HadFinalState * ApplyYourself(const G4HadProjectile & aTrack,
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G4Nucleus & targetNucleus);
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void Initialise();
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G4double XscIntegrand(G4double x);
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G4double CalculateAm( G4double momentum);
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inline G4double GetAm(){return fAm;};
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// sample recoil electron energy in lab frame
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G4double SampleSin2HalfTheta(G4double Tkin);
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G4double GetTransfer( G4int iTkin, G4int iTransfer, G4double position );
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void SetCutEnergy(G4double ec){fCutEnergy=ec;};
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G4double GetCutEnergy(){return fCutEnergy;};
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virtual void ModelDescription(std::ostream&) const;
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private:
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G4double fAm, fM, fM2, fMv2, fme, fme2, fee, fee2;
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G4double fMinEnergy, fMaxEnergy;
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G4int fEnergyBin, fAngleBin;
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G4ParticleDefinition* theElectron;
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G4double fCutEnergy; // minimal recoil electron energy detected
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G4PhysicsLogVector* fEnergyVector;
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G4PhysicsTable* fAngleTable;
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};
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////////////////////////////////////////////////////////////////////
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//
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// return Wentzel atom screening correction for neutron-electron scattering
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inline G4double G4NeutronElectronElModel::CalculateAm( G4double Tkin)
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{
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fee = (Tkin+fM)*fme/fM;
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// G4cout<<"fee = "<<fee<<" MeV"<<G4endl;
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fee2 = fee*fee;
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G4double momentum = std::sqrt( fee2 - fme2 );
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G4double k = momentum/CLHEP::hbarc;
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G4double ch = 1.13;
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G4double zn = 1.77*k*CLHEP::Bohr_radius;
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G4double zn2 = zn*zn;
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fAm = ch/zn2;
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return fAm;
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}
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#endif
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