Gabriele Cosmo
144 lines
5.1 KiB
C++
144 lines
5.1 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: G4PEEffectModel.hh,v 1.6 2007/05/22 17:34:36 vnivanch Exp $
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// GEANT4 tag $Name: geant4-09-02 $
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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: G4PEEffectModel
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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: 21.04.2005
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//
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// Modifications:
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//
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// 06.02.2006 : added ComputeMeanFreePath() (mma)
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//
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// Class Description:
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//
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// Implementation of the photo-electric effect
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//
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// -------------------------------------------------------------------
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//
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#ifndef G4PEEffectModel_h
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#define G4PEEffectModel_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 G4PEEffectModel : public G4VEmModel
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{
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public:
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G4PEEffectModel(const G4ParticleDefinition* p = 0,
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const G4String& nam = "PhotoElectric");
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virtual ~G4PEEffectModel();
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virtual void Initialise(const G4ParticleDefinition*, const G4DataVector&);
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G4double ComputeCrossSectionPerAtom(const G4ParticleDefinition*,
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G4double kinEnergy,
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G4double Z,
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G4double A,
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G4double, G4double);
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G4double ComputeMeanFreePath( const G4ParticleDefinition*,
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G4double kinEnergy,
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const G4Material* material,
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G4double, G4double);
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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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protected:
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virtual G4double ElecCosThetaDistribution(G4double ElecKineEnergy);
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private:
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G4ParticleDefinition* theGamma;
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G4ParticleDefinition* theElectron;
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G4ParticleChangeForGamma* fParticleChange;
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G4double fminimalEnergy;
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G4bool isInitialized;
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};
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.....
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inline G4double G4PEEffectModel::ComputeCrossSectionPerAtom(
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const G4ParticleDefinition*,
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G4double energy,
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G4double Z, G4double,
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G4double, G4double)
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{
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G4double* SandiaCof = G4SandiaTable::GetSandiaCofPerAtom((G4int)Z, energy);
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G4double energy2 = energy*energy, energy3 = energy*energy2,
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energy4 = energy2*energy2;
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return SandiaCof[0]/energy + SandiaCof[1]/energy2 +
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SandiaCof[2]/energy3 + SandiaCof[3]/energy4;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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inline G4double G4PEEffectModel::ComputeMeanFreePath(
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const G4ParticleDefinition*,
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G4double energy,
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const G4Material* material,
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G4double, G4double)
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{
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G4double* SandiaCof = material->GetSandiaTable()
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->GetSandiaCofForMaterial(energy);
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G4double energy2 = energy*energy, energy3 = energy*energy2,
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energy4 = energy2*energy2;
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G4double cross = SandiaCof[0]/energy + SandiaCof[1]/energy2 +
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SandiaCof[2]/energy3 + SandiaCof[3]/energy4;
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G4double mfp = DBL_MAX;
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if (cross > 0.) mfp = 1./cross;
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return mfp;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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#endif
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