00001 // 00002 // ******************************************************************** 00003 // * License and Disclaimer * 00004 // * * 00005 // * The Geant4 software is copyright of the Copyright Holders of * 00006 // * the Geant4 Collaboration. It is provided under the terms and * 00007 // * conditions of the Geant4 Software License, included in the file * 00008 // * LICENSE and available at http://cern.ch/geant4/license . These * 00009 // * include a list of copyright holders. * 00010 // * * 00011 // * Neither the authors of this software system, nor their employing * 00012 // * institutes,nor the agencies providing financial support for this * 00013 // * work make any representation or warranty, express or implied, * 00014 // * regarding this software system or assume any liability for its * 00015 // * use. Please see the license in the file LICENSE and URL above * 00016 // * for the full disclaimer and the limitation of liability. * 00017 // * * 00018 // * This code implementation is the result of the scientific and * 00019 // * technical work of the GEANT4 collaboration. * 00020 // * By using, copying, modifying or distributing the software (or * 00021 // * any work based on the software) you agree to acknowledge its * 00022 // * use in resulting scientific publications, and indicate your * 00023 // * acceptance of all terms of the Geant4 Software license. * 00024 // ******************************************************************** 00025 // 00026 // 00027 // $Id: G4AnnihiToMuPair.hh 66996 2013-01-29 14:50:52Z gcosmo $ 00028 // 00029 // ------------ G4AnnihiToMuPair physics process ------ 00030 // by H.Burkhardt, S. Kelner and R. Kokoulin, November 2002 00031 // ----------------------------------------------------------------------------- 00032 00033 // class description 00034 // 00035 // (high energy) e+ (atomic) e- ---> mu+ mu- 00036 // inherit from G4VDiscreteProcess 00037 // 00038 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......// 00039 // 00040 // 04.02.03 : cosmetic simplifications (mma) 00041 // 27.01.03 : first implementation (hbu) 00042 // 00043 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... 00044 00045 #ifndef G4AnnihiToMuPair_h 00046 #define G4AnnihiToMuPair_h 1 00047 00048 #include "G4VDiscreteProcess.hh" 00049 #include "globals.hh" 00050 00051 class G4ParticleDefinition; 00052 class G4Track; 00053 class G4Step; 00054 00055 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... 00056 00057 class G4AnnihiToMuPair : public G4VDiscreteProcess 00058 { 00059 public: // with description 00060 00061 G4AnnihiToMuPair(const G4String& processName ="AnnihiToMuPair", 00062 G4ProcessType type = fElectromagnetic); 00063 00064 ~G4AnnihiToMuPair(); 00065 00066 G4bool IsApplicable(const G4ParticleDefinition&); 00067 // true for positron only. 00068 00069 void BuildPhysicsTable(const G4ParticleDefinition&); 00070 // here dummy, just calling PrintInfoDefinition 00071 // the total cross section is calculated analytically 00072 00073 void PrintInfoDefinition(); 00074 // Print few lines of informations about the process: validity range, 00075 // origine ..etc.. 00076 // Invoked by BuildPhysicsTable(). 00077 00078 void SetCrossSecFactor(G4double fac); 00079 // Set the factor to artificially increase the crossSection (default 1) 00080 00081 G4double GetCrossSecFactor() {return CrossSecFactor;}; 00082 // Get the factor to artificially increase the cross section 00083 00084 G4double CrossSectionPerVolume(G4double PositronEnergy, 00085 const G4Material*); 00086 // Compute total cross section 00087 00088 G4double ComputeCrossSectionPerAtom(G4double PositronEnergy, 00089 G4double AtomicZ); 00090 // Compute total cross section 00091 00092 G4double GetMeanFreePath(const G4Track& aTrack, 00093 G4double previousStepSize, 00094 G4ForceCondition* ); 00095 // It returns the MeanFreePath of the process for the current track : 00096 // (energy, material) 00097 // The previousStepSize and G4ForceCondition* are not used. 00098 // This function overloads a virtual function of the base class. 00099 // It is invoked by the ProcessManager of the Particle. 00100 00101 G4VParticleChange* PostStepDoIt(const G4Track& aTrack, 00102 const G4Step& aStep); 00103 // It computes the final state of the process (at end of step), 00104 // returned as a ParticleChange object. 00105 // This function overloads a virtual function of the base class. 00106 // It is invoked by the ProcessManager of the Particle. 00107 00108 private: 00109 00110 // hide assignment operator as private 00111 G4AnnihiToMuPair& operator=(const G4AnnihiToMuPair &right); 00112 G4AnnihiToMuPair(const G4AnnihiToMuPair& ); 00113 00114 G4double LowestEnergyLimit; // Energy threshold of e+ 00115 G4double HighestEnergyLimit; // Limit of validity of the model 00116 00117 G4double CurrentSigma; // the last value of cross section per volume 00118 00119 G4double CrossSecFactor; // factor to artificially increase 00120 // the cross section, static to make sure 00121 // to have single value 00122 }; 00123 00124 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... 00125 00126 #endif 00127