Geant4 Cross Reference

Cross-Referencing   Geant4
Geant4/processes/electromagnetic/highenergy/include/G4AnnihiToMuPair.hh

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 26 //
 27 //
 28 //         ------------ G4AnnihiToMuPair physics process ------
 29 //         by H.Burkhardt, S. Kelner and R. Kokoulin, November 2002
 30 // -----------------------------------------------------------------------------
 31 
 32 // class description
 33 //
 34 // (high energy) e+ (atomic) e- ---> mu+ mu-
 35 // inherit from G4VDiscreteProcess
 36 //
 37 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......//
 38 //
 39 // 04.02.03 : cosmetic simplifications (mma)
 40 // 27.01.03 : first implementation (hbu)
 41 //
 42 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 43 
 44 #ifndef G4AnnihiToMuPair_h
 45 #define G4AnnihiToMuPair_h 1
 46 
 47 #include "G4VDiscreteProcess.hh"
 48 #include "globals.hh"
 49 
 50 class G4LossTableManager;
 51 class G4ParticleDefinition;
 52 class G4Track;
 53 class G4Step;
 54 
 55 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 56 
 57 class G4AnnihiToMuPair : public G4VDiscreteProcess
 58 {
 59 public:  // with description
 60 
 61   explicit G4AnnihiToMuPair(const G4String& processName ="AnnihiToMuPair",
 62           G4ProcessType type = fElectromagnetic);
 63 
 64   ~G4AnnihiToMuPair() override;
 65 
 66   G4bool IsApplicable(const G4ParticleDefinition&) override;
 67   // true for positron only.
 68 
 69   void BuildPhysicsTable(const G4ParticleDefinition&) override;
 70   // here dummy, just calling PrintInfoDefinition
 71   // the total cross section is calculated analytically
 72 
 73   void PrintInfoDefinition();
 74   // Print few lines of informations about the process: validity range,
 75   // origine ..etc..
 76   // Invoked by BuildPhysicsTable().
 77 
 78   void SetCrossSecFactor(G4double fac);
 79   // Set the factor to artificially increase the crossSection (default 1)
 80 
 81   G4double GetCrossSecFactor() {return fCrossSecFactor;};
 82   // Get the factor to artificially increase the cross section
 83 
 84   G4double CrossSectionPerVolume(G4double positronEnergy, const G4Material*);
 85 
 86   G4double ComputeCrossSectionPerElectron(const G4double energy);
 87 
 88   G4double ComputeCrossSectionPerAtom(const G4double energy, const G4double Z);
 89 
 90   G4double GetMeanFreePath(const G4Track& aTrack,
 91          G4double previousStepSize,
 92          G4ForceCondition* ) override;
 93   // It returns the MeanFreePath of the process for the current track :
 94   // (energy, material)
 95   // The previousStepSize and G4ForceCondition* are not used.
 96   // This function overloads a virtual function of the base class.
 97   // It is invoked by the ProcessManager of the Particle.
 98 
 99   G4VParticleChange* PostStepDoIt(const G4Track& aTrack,
100           const G4Step& aStep) override;
101   // It computes the final state of the process (at end of step),
102   // returned as a ParticleChange object.
103   // This function overloads a virtual function of the base class.
104   // It is invoked by the ProcessManager of the Particle.
105 
106   // hide assignment operator as private
107   G4AnnihiToMuPair& operator=(const G4AnnihiToMuPair &right) = delete;
108   G4AnnihiToMuPair(const G4AnnihiToMuPair& ) = delete;
109 
110 private:
111 
112   G4LossTableManager* fManager;
113   const G4ParticleDefinition* part1;
114   const G4ParticleDefinition* part2;
115   G4double fMass;
116 
117   G4double fLowEnergyLimit;  // Energy threshold of e+
118   G4double fHighEnergyLimit; // Limit of validity of the model
119   G4double fCurrentSigma;    // the last value of cross section per volume 
120   G4double fCrossSecFactor;  // factor to increase the cross section
121   G4String fInfo = "e+e->mu+mu-";
122 };
123 
124 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
125 
126 #endif
127 
128