Gabriele Cosmo
146 lines
4.8 KiB
C++
146 lines
4.8 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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// $Id: G4BetheHeitlerModel.hh,v 1.6 2007/05/22 17:34:36 vnivanch Exp $
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// GEANT4 tag $Name: geant4-09-01 $
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//
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// -------------------------------------------------------------------
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//
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// GEANT4 Class header file
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//
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//
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// File name: G4BetheHeitlerModel
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//
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// Author: Vladimir Ivanchenko on base of Michel Maire code
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//
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// Creation date: 19.04.2005
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//
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// Modifications:
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// 02-02-06 Remove InitialiseCrossSectionPerAtom();
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//
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// Class Description:
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//
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// Implementation of gamma convertion to e+e- in the field of a nucleus
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//
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// -------------------------------------------------------------------
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//
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#ifndef G4BetheHeitlerModel_h
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#define G4BetheHeitlerModel_h 1
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#include "G4VEmModel.hh"
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#include "G4PhysicsTable.hh"
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class G4ParticleChangeForGamma;
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class G4BetheHeitlerModel : public G4VEmModel
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{
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public:
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G4BetheHeitlerModel(const G4ParticleDefinition* p = 0,
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const G4String& nam = "Bethe-Heitler");
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virtual ~G4BetheHeitlerModel();
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virtual void Initialise(const G4ParticleDefinition*, const G4DataVector&);
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virtual G4double ComputeCrossSectionPerAtom(
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const G4ParticleDefinition*,
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G4double kinEnergy,
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G4double Z,
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G4double A=0.,
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G4double cut=0.,
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G4double emax=DBL_MAX);
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virtual void SampleSecondaries(std::vector<G4DynamicParticle*>*,
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const G4MaterialCutsCouple*,
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const G4DynamicParticle*,
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G4double tmin,
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G4double maxEnergy);
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private:
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G4double ScreenFunction1(G4double ScreenVariable);
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G4double ScreenFunction2(G4double ScreenVariable);
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// hide assignment operator
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G4BetheHeitlerModel & operator=(const G4BetheHeitlerModel &right);
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G4BetheHeitlerModel(const G4BetheHeitlerModel&);
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G4ParticleDefinition* theGamma;
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G4ParticleDefinition* theElectron;
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G4ParticleDefinition* thePositron;
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G4ParticleChangeForGamma* fParticleChange;
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G4PhysicsTable* theCrossSectionTable;
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G4double lowGammaEnergy;
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G4double highGammaEnergy;
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G4int nbins;
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size_t indexZ[120];
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};
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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inline G4double G4BetheHeitlerModel::ScreenFunction1(G4double ScreenVariable)
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// compute the value of the screening function 3*PHI1 - PHI2
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{
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G4double screenVal;
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if (ScreenVariable > 1.)
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screenVal = 42.24 - 8.368*std::log(ScreenVariable+0.952);
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else
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screenVal = 42.392 - ScreenVariable*(7.796 - 1.961*ScreenVariable);
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return screenVal;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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inline G4double G4BetheHeitlerModel::ScreenFunction2(G4double ScreenVariable)
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// compute the value of the screening function 1.5*PHI1 - 0.5*PHI2
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{
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G4double screenVal;
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if (ScreenVariable > 1.)
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screenVal = 42.24 - 8.368*std::log(ScreenVariable+0.952);
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else
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screenVal = 41.405 - ScreenVariable*(5.828 - 0.8945*ScreenVariable);
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return screenVal;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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#endif
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