Gabriele Cosmo
128 lines
5.0 KiB
C++
128 lines
5.0 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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// ------------ G4AnnihiToMuPair physics process ------
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// by H.Burkhardt, S. Kelner and R. Kokoulin, November 2002
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// -----------------------------------------------------------------------------
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// class description
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//
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// (high energy) e+ (atomic) e- ---> mu+ mu-
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// inherit from G4VDiscreteProcess
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//
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......//
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//
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// 04.02.03 : cosmetic simplifications (mma)
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// 27.01.03 : first implementation (hbu)
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//
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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#ifndef G4AnnihiToMuPair_h
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#define G4AnnihiToMuPair_h 1
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#include "G4VDiscreteProcess.hh"
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#include "globals.hh"
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class G4LossTableManager;
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class G4ParticleDefinition;
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class G4Track;
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class G4Step;
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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class G4AnnihiToMuPair : public G4VDiscreteProcess
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{
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public: // with description
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explicit G4AnnihiToMuPair(const G4String& processName ="AnnihiToMuPair",
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G4ProcessType type = fElectromagnetic);
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~G4AnnihiToMuPair() override;
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G4bool IsApplicable(const G4ParticleDefinition&) override;
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// true for positron only.
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void BuildPhysicsTable(const G4ParticleDefinition&) override;
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// here dummy, just calling PrintInfoDefinition
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// the total cross section is calculated analytically
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void PrintInfoDefinition();
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// Print few lines of informations about the process: validity range,
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// origine ..etc..
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// Invoked by BuildPhysicsTable().
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void SetCrossSecFactor(G4double fac);
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// Set the factor to artificially increase the crossSection (default 1)
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G4double GetCrossSecFactor() {return fCrossSecFactor;};
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// Get the factor to artificially increase the cross section
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G4double CrossSectionPerVolume(G4double positronEnergy, const G4Material*);
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G4double ComputeCrossSectionPerElectron(const G4double energy);
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G4double ComputeCrossSectionPerAtom(const G4double energy, const G4double Z);
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G4double GetMeanFreePath(const G4Track& aTrack,
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G4double previousStepSize,
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G4ForceCondition* ) override;
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// It returns the MeanFreePath of the process for the current track :
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// (energy, material)
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// The previousStepSize and G4ForceCondition* are not used.
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// This function overloads a virtual function of the base class.
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// It is invoked by the ProcessManager of the Particle.
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G4VParticleChange* PostStepDoIt(const G4Track& aTrack,
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const G4Step& aStep) override;
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// It computes the final state of the process (at end of step),
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// returned as a ParticleChange object.
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// This function overloads a virtual function of the base class.
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// It is invoked by the ProcessManager of the Particle.
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// hide assignment operator as private
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G4AnnihiToMuPair& operator=(const G4AnnihiToMuPair &right) = delete;
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G4AnnihiToMuPair(const G4AnnihiToMuPair& ) = delete;
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private:
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G4LossTableManager* fManager;
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const G4ParticleDefinition* part1;
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const G4ParticleDefinition* part2;
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G4double fMass;
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G4double fLowEnergyLimit; // Energy threshold of e+
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G4double fHighEnergyLimit; // Limit of validity of the model
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G4double fCurrentSigma; // the last value of cross section per volume
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G4double fCrossSecFactor; // factor to increase the cross section
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G4String fInfo = "e+e->mu+mu-";
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};
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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#endif
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