Gabriele Cosmo
137 lines
5.3 KiB
C++
137 lines
5.3 KiB
C++
// This code implementation is the intellectual property of
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// the GEANT4 collaboration.
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//
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// By copying, distributing or modifying the Program (or any work
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// based on the Program) you indicate your acceptance of this statement,
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// and all its terms.
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//
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// $Id: G4eplusAnnihilation.hh,v 1.3 1999/12/17 18:26:12 maire Exp $
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// GEANT4 tag $Name: geant4-03-00 $
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//
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// ------------ G4eplusAnnihilation process ------
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// by Michel Maire, 7 july 1996
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//
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// 10-01-97, crossection table + meanfreepath table, M.Maire
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// 17-03-97, merge 'in fly' and 'at rest', M.Maire
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// 31-08-98, new methods SetBining() and PrintInfo()
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// ------------------------------------------------------------
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// class description
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//
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// e+ e- ---> gamma gamma
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// inherit from G4VRestDiscreteProcess
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//
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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#ifndef G4eplusAnnihilation_h
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#define G4eplusAnnihilation_h 1
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#include "G4ios.hh"
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#include "globals.hh"
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#include "Randomize.hh"
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#include "G4VRestDiscreteProcess.hh"
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#include "G4PhysicsTable.hh"
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#include "G4PhysicsLogVector.hh"
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#include "G4ElementTable.hh"
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#include "G4Gamma.hh"
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#include "G4Positron.hh"
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#include "G4Step.hh"
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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class G4eplusAnnihilation : public G4VRestDiscreteProcess
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{
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public: // with description
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G4eplusAnnihilation(const G4String& processName ="annihil");
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~G4eplusAnnihilation();
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G4bool IsApplicable(const G4ParticleDefinition&);
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// true for positron only.
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void SetPhysicsTableBining(G4double lowE, G4double highE, G4int nBins);
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// Allows to define the binning of the PhysicsTables,
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// before to build them.
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void BuildPhysicsTable(const G4ParticleDefinition& PositronType);
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// It builds the total CrossSectionPerAtom table, for e+,
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// and for every element contained in the elementTable.
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// It builds the MeanFreePath table, for e+,
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// and for every material contained in the materialTable.
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// This function overloads a virtual function of the base class.
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// It is invoked by the G4ParticleWithCuts::SetCut() method.
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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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G4double GetMeanFreePath(const G4Track& aTrack,
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G4double previousStepSize,
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G4ForceCondition* condition);
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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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G4double GetCrossSectionPerAtom(G4DynamicParticle* aDynamicPositron,
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G4Element* anElement);
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// It returns the total CrossSectionPerAtom of the process,
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// for the current DynamicPositron (energy), in anElement.
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G4VParticleChange* PostStepDoIt(const G4Track& aTrack,
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const G4Step& aStep);
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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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G4double GetMeanLifeTime(const G4Track& aTrack,
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G4ForceCondition* condition);
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// It is invoked by the ProcessManager of the Positron if this
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// e+ has a kinetic energy null. Then it return 0 to force the
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// call of AtRestDoIt.
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// This function overloads a virtual function of the base class.
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G4VParticleChange* AtRestDoIt(const G4Track& aTrack,
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const G4Step& aStep);
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// It computes the final state of the process:
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// e+ (at rest) e- (at rest) ---> gamma gamma,
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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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protected:
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virtual G4double ComputeCrossSectionPerAtom(G4double PositKinEnergy,
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G4double AtomicNumber);
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virtual G4double ComputeMeanFreePath(G4double PositKinEnergy,
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G4Material* aMaterial);
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private:
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// hide assignment operator as private
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G4eplusAnnihilation& operator=(const G4eplusAnnihilation &right);
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G4eplusAnnihilation(const G4eplusAnnihilation& );
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private:
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G4PhysicsTable* theCrossSectionTable; // table for crossection
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G4PhysicsTable* theMeanFreePathTable;
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G4double LowestEnergyLimit ; // low energy limit of the crossection formula
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G4double HighestEnergyLimit ; // high energy limit of the crossection formula
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G4int NumbBinTable ; // number of bins in the crossection table
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};
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#include "G4eplusAnnihilation.icc"
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#endif
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