include/Geant4/G4InteractionLawPhysical.hh

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0025 //
0026 // G4InteractionLawPhysical
0027 //
0028 // Class Description:
0029 //
0030 // A G4VBiasingInteractionLaw representing the usual
0031 // physical exponential law, of constant cross-section of the step.
0032 //
0033 // Author: Marc Verderi, November 2013.
0034 // --------------------------------------------------------------------
0035 #ifndef G4InteractionLawPhysical_hh
0036 #define G4InteractionLawPhysical_hh 1
0037
0038 #include "G4VBiasingInteractionLaw.hh"
0039
0040 class G4InteractionLawPhysical : public G4VBiasingInteractionLaw
0041 {
0042   public:
0043
0044     G4InteractionLawPhysical(const G4String& name = "exponentialLaw");
0045     virtual ~G4InteractionLawPhysical();
0046
0047     void SetPhysicalCrossSection(G4double crossSection);
0048     G4double GetPhysicalCrossSection() const { return fCrossSection; }
0049
0050     virtual G4double ComputeEffectiveCrossSectionAt(G4double length) const;
0051     virtual G4double ComputeNonInteractionProbabilityAt(G4double length) const;
0052     // -- sample the distribution
0053     virtual  G4double SampleInteractionLength();
0054     // -- move by true path length, this position becomes the new initial point
0055     virtual G4double UpdateInteractionLengthForStep(G4double truePathLength);
0056
0057   private:
0058
0059     G4double fCrossSection = 0.0;
0060     G4bool fCrossSectionDefined = false;
0061     G4double fNumberOfInteractionLength = -1.0;
0062 };
0063
0064 #endif