Gabriele Cosmo
123 lines
4.5 KiB
C++
123 lines
4.5 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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//
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// GEANT4 Class header file
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//
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//
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// File name: G4eplusTo2or3GammaModel
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//
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// Author: Vladimir Ivanchenko and Omrane Kadri
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//
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// Creation date: 29.03.2018
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//
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//
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// Class Description:
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//
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// Implementation of e+ annihilation into 2 or 3 gamma on fly
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// Annihilation at rest is sampled by G4VPositronAtRestModel
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// Implementation of 3-gamma annihilation is performed by
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// G4eplusTo3GammaOKVIModel. Cross section of both models
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// depend on cut parameter fDelta, which defines relative low-energy
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// limit on 3d gamma energy. For computation of the cross section
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// next to leading order radiative corrections are taken into account,
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// atomic effects at low-energy are not considered.
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//
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// V.N.Baier, V.S. Fadin, V.A. Khose, E.A. Kuraev,
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// Physics Reports 78 (1981) 293-393.
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//
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// -------------------------------------------------------------------
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//
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#ifndef G4eplusTo2or3GammaModel_h
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#define G4eplusTo2or3GammaModel_h 1
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#include "G4VEmModel.hh"
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class G4eplusTo3GammaOKVIModel;
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class G4ParticleChangeForGamma;
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class G4PhysicsVector;
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class G4DataVector;
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class G4eplusTo2or3GammaModel : public G4VEmModel
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{
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public:
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G4eplusTo2or3GammaModel();
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~G4eplusTo2or3GammaModel() override;
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void Initialise(const G4ParticleDefinition*, const G4DataVector&) override;
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G4double ComputeCrossSectionPerElectron(G4double kinEnergy);
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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 cutEnergy = 0.,
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G4double maxEnergy = DBL_MAX) override;
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G4double CrossSectionPerVolume(const G4Material*,
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const G4ParticleDefinition*,
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G4double kineticEnergy,
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G4double cutEnergy = 0.0,
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G4double maxEnergy = DBL_MAX) override;
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void SampleSecondaries(std::vector<G4DynamicParticle*>*,
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const G4MaterialCutsCouple*,
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const G4DynamicParticle*,
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G4double tmin = 0.0,
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G4double maxEnergy = DBL_MAX) override;
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void SetDelta(G4double val) { if(val > 0.0) { fDeltaMin = val; } };
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// hide assignment operator
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G4eplusTo2or3GammaModel & operator=
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(const G4eplusTo2or3GammaModel &right) = delete;
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G4eplusTo2or3GammaModel(const G4eplusTo2or3GammaModel&) = delete;
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private:
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const G4ParticleDefinition* theGamma;
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G4ParticleChangeForGamma* fParticleChange;
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G4eplusTo3GammaOKVIModel* f3GModel;
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G4double fDeltaMin; // fixed minimal relative limit
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G4double fDelta; // running limit - function of energy
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G4double fGammaTh; // 3-gamma annihilation low-energy limit
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static G4PhysicsVector* fCrossSection;
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static G4PhysicsVector* f3GProbability;
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};
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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#endif
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