Geant4 Cross Reference

Cross-Referencing   Geant4
Geant4/processes/biasing/generic/include/G4ILawForceFreeFlight.hh

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 25 //
 26 // G4ILawForceFreeFlight
 27 //
 28 // Class Description:
 29 //
 30 // A G4VBiasingInteractionLaw representing the "interaction" law
 31 // for a force free flight, ie, a particle which does not interact.
 32 // It is a limit case for which the non-interaction probability over
 33 // a segment is always 1, and the effective cross-section always
 34 // zero. This singular behavior is signaled by the IsSingular()
 35 // method returning always true.
 36 //
 37 // Author: Marc Verderi, November 2013.
 38 // --------------------------------------------------------------------
 39 #ifndef G4ILawForceFreeFlight_hh
 40 #define G4ILawForceFreeFlight_hh 1
 41 
 42 #include "G4VBiasingInteractionLaw.hh"
 43 
 44 class G4ILawForceFreeFlight : public G4VBiasingInteractionLaw
 45 {
 46   public:
 47 
 48     G4ILawForceFreeFlight(const G4String& name = "forceFreeFlightLaw");
 49     virtual ~G4ILawForceFreeFlight();
 50   
 51     virtual G4double ComputeEffectiveCrossSectionAt(G4double length) const;
 52     virtual G4double ComputeNonInteractionProbabilityAt(G4double length) const;
 53 
 54     // -- sample the distribution
 55     virtual  G4double SampleInteractionLength();
 56     // -- move by true path length, this position becomes the new initial point
 57     virtual G4double UpdateInteractionLengthForStep(G4double truePathLength);
 58     virtual G4bool IsSingular() const { return true; }
 59 };
 60 
 61 #endif
 62