[819] | 1 | // |
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| 2 | // ******************************************************************** |
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| 3 | // * License and Disclaimer * |
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| 4 | // * * |
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| 5 | // * The Geant4 software is copyright of the Copyright Holders of * |
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| 6 | // * the Geant4 Collaboration. It is provided under the terms and * |
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| 7 | // * conditions of the Geant4 Software License, included in the file * |
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| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
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| 9 | // * include a list of copyright holders. * |
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| 10 | // * * |
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| 11 | // * Neither the authors of this software system, nor their employing * |
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| 12 | // * institutes,nor the agencies providing financial support for this * |
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| 13 | // * work make any representation or warranty, express or implied, * |
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| 14 | // * regarding this software system or assume any liability for its * |
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| 15 | // * use. Please see the license in the file LICENSE and URL above * |
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| 16 | // * for the full disclaimer and the limitation of liability. * |
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| 17 | // * * |
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| 18 | // * This code implementation is the result of the scientific and * |
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| 19 | // * technical work of the GEANT4 collaboration. * |
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| 20 | // * By using, copying, modifying or distributing the software (or * |
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| 21 | // * any work based on the software) you agree to acknowledge its * |
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| 22 | // * use in resulting scientific publications, and indicate your * |
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| 23 | // * acceptance of all terms of the Geant4 Software license. * |
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| 24 | // ******************************************************************** |
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| 25 | // |
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| 26 | // |
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| 27 | // $Id: G4AnnihiToMuPair.hh,v 1.2 2006/06/29 19:32:12 gunter Exp $ |
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[1007] | 28 | // GEANT4 tag $Name: geant4-09-02 $ |
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[819] | 29 | // |
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| 30 | // ------------ G4AnnihiToMuPair physics process ------ |
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| 31 | // by H.Burkhardt, S. Kelner and R. Kokoulin, November 2002 |
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| 32 | // ----------------------------------------------------------------------------- |
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| 33 | |
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| 34 | // class description |
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| 35 | // |
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| 36 | // (high energy) e+ (atomic) e- ---> mu+ mu- |
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| 37 | // inherit from G4VDiscreteProcess |
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| 38 | // |
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| 39 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......// |
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| 40 | // |
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| 41 | // 04.02.03 : cosmetic simplifications (mma) |
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| 42 | // 27.01.03 : first implementation (hbu) |
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| 43 | // |
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| 44 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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| 45 | |
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| 46 | #ifndef G4AnnihiToMuPair_h |
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| 47 | #define G4AnnihiToMuPair_h 1 |
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| 48 | |
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| 49 | #include "G4VDiscreteProcess.hh" |
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| 50 | #include "globals.hh" |
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| 51 | |
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| 52 | class G4ParticleDefinition; |
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| 53 | class G4Track; |
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| 54 | class G4Step; |
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| 55 | |
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| 56 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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| 57 | |
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| 58 | class G4AnnihiToMuPair : public G4VDiscreteProcess |
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| 59 | { |
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| 60 | public: // with description |
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| 61 | |
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| 62 | G4AnnihiToMuPair(const G4String& processName ="AnnihiToMuPair", |
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| 63 | G4ProcessType type = fElectromagnetic); |
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| 64 | |
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| 65 | ~G4AnnihiToMuPair(); |
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| 66 | |
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| 67 | G4bool IsApplicable(const G4ParticleDefinition&); |
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| 68 | // true for positron only. |
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| 69 | |
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| 70 | void BuildPhysicsTable(const G4ParticleDefinition&); |
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| 71 | // here dummy, just calling PrintInfoDefinition |
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| 72 | // the total cross section is calculated analytically |
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| 73 | |
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| 74 | void PrintInfoDefinition(); |
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| 75 | // Print few lines of informations about the process: validity range, |
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| 76 | // origine ..etc.. |
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| 77 | // Invoked by BuildPhysicsTable(). |
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| 78 | |
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| 79 | void SetCrossSecFactor(G4double fac); |
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| 80 | // Set the factor to artificially increase the crossSection (default 1) |
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| 81 | |
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| 82 | G4double GetCrossSecFactor() {return CrossSecFactor;}; |
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| 83 | // Get the factor to artificially increase the cross section |
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| 84 | |
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| 85 | virtual |
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| 86 | G4double ComputeCrossSectionPerAtom(G4double PositronEnergy, |
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| 87 | G4double AtomicZ); |
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| 88 | // Compute total cross section |
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| 89 | |
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| 90 | G4double GetMeanFreePath(const G4Track& aTrack, |
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| 91 | G4double previousStepSize, |
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| 92 | G4ForceCondition* ); |
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| 93 | // It returns the MeanFreePath of the process for the current track : |
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| 94 | // (energy, material) |
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| 95 | // The previousStepSize and G4ForceCondition* are not used. |
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| 96 | // This function overloads a virtual function of the base class. |
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| 97 | // It is invoked by the ProcessManager of the Particle. |
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| 98 | |
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| 99 | G4VParticleChange* PostStepDoIt(const G4Track& aTrack, |
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| 100 | const G4Step& aStep); |
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| 101 | // It computes the final state of the process (at end of step), |
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| 102 | // returned as a ParticleChange object. |
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| 103 | // This function overloads a virtual function of the base class. |
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| 104 | // It is invoked by the ProcessManager of the Particle. |
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| 105 | |
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| 106 | private: |
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| 107 | |
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| 108 | // hide assignment operator as private |
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| 109 | G4AnnihiToMuPair& operator=(const G4AnnihiToMuPair &right); |
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| 110 | G4AnnihiToMuPair(const G4AnnihiToMuPair& ); |
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| 111 | |
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| 112 | private: |
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| 113 | |
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| 114 | G4double LowestEnergyLimit; // Energy threshold of e+ |
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| 115 | G4double HighestEnergyLimit; // Limit of validity of the model |
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| 116 | |
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| 117 | G4double CrossSecFactor; // factor to artificially increase |
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| 118 | // the cross section, static to make sure |
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| 119 | // to have single value |
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| 120 | }; |
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| 121 | |
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| 122 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
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| 123 | |
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| 124 | #endif |
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| 125 | |
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