G4eplusPolarizedAnnihilation.hh

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// $Id$
//
// -------------------------------------------------------------------
//
// GEANT4 Class header file
//
//
// File name:     G4eplusPolarizedAnnihilation
//
// Author:        A. Schaelicke on base of Vladimir Ivanchenko / Michel Maire code
//
// Creation date: 02.07.2006
//
// Modifications:
// 26-07-06 modified cross section  (P. Starovoitov)
// 21-08-06 interface updated   (A. Schaelicke)
// 11-06-07, add PostStepGetPhysicalInteractionLength (A.Schalicke)
//
//
// Class Description:
//
// Polarized process of e+ annihilation into 2 gammas
//
 
// -------------------------------------------------------------------
//
 
#ifndef G4eplusPolarizedAnnihilation_h
#define G4eplusPolarizedAnnihilation_h 1
 
#include "G4VEmProcess.hh"
#include "G4Positron.hh"
#include "G4VEmModel.hh"
 
 
class G4PolarizedAnnihilationModel;
 
class G4eplusPolarizedAnnihilation : public G4VEmProcess
{
 
public:
 
  G4eplusPolarizedAnnihilation(const G4String& name = "pol-annihil");
 
  virtual ~G4eplusPolarizedAnnihilation();
 
  virtual G4bool IsApplicable(const G4ParticleDefinition& p);
 
  virtual G4VParticleChange* AtRestDoIt(
                             const G4Track& track,
                             const G4Step& stepData);
 
  G4double AtRestGetPhysicalInteractionLength(
                             const G4Track& track,
                             G4ForceCondition* condition
                            );
 
  // Print out of the class parameters
  virtual void PrintInfo();
 
  // for polarization
  //  G4VParticleChange* PostStepDoIt(const G4Track&, const G4Step&);
 
  G4double GetMeanFreePath(const G4Track& track,
                              G4double previousStepSize,
                              G4ForceCondition* condition);
 
  G4double PostStepGetPhysicalInteractionLength(
                             const G4Track& track,
                             G4double   previousStepSize,
                             G4ForceCondition* condition
                            );
 
  virtual void BuildPhysicsTable(const G4ParticleDefinition&);
  void BuildAsymmetryTable(const G4ParticleDefinition& part);
  virtual void PreparePhysicsTable(const G4ParticleDefinition&);
 
  G4double ComputeAsymmetry(G4double energy,
                const G4MaterialCutsCouple* couple,
                const G4ParticleDefinition& particle,
                G4double cut,
                G4double &tasm);
 
protected:
 
  virtual void InitialiseProcess(const G4ParticleDefinition*);
 
private:
  
  G4bool isInitialised;
 
  // for polarization:
  G4PolarizedAnnihilationModel* emModel;
  G4ThreeVector theTargetPolarization;
 
  G4PhysicsTable* theAsymmetryTable;          // table for cross section assym.
  G4PhysicsTable* theTransverseAsymmetryTable; // table for transverse cross section assym.
};
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 
inline G4bool G4eplusPolarizedAnnihilation::IsApplicable(const G4ParticleDefinition& p)
{
  return (&p == G4Positron::Positron());
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 
inline G4double G4eplusPolarizedAnnihilation::AtRestGetPhysicalInteractionLength(
                              const G4Track&, G4ForceCondition* condition)
{
  *condition = NotForced;
  return 0.0;
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 
#endif