include/Geant4/G4InteractionLawPhysical.hh

0001 //
0002 // ********************************************************************
0003 // * License and Disclaimer                                           *
0004 // *                                                                  *
0005 // * The  Geant4 software  is  copyright of the Copyright Holders  of *
0006 // * the Geant4 Collaboration.  It is provided  under  the terms  and *
0007 // * conditions of the Geant4 Software License,  included in the file *
0008 // * LICENSE and available at  http://cern.ch/geant4/license .  These *
0009 // * include a list of copyright holders.                             *
0010 // *                                                                  *
0011 // * Neither the authors of this software system, nor their employing *
0012 // * institutes,nor the agencies providing financial support for this *
0013 // * work  make  any representation or  warranty, express or implied, *
0014 // * regarding  this  software system or assume any liability for its *
0015 // * use.  Please see the license in the file  LICENSE  and URL above *
0016 // * for the full disclaimer and the limitation of liability.         *
0017 // *                                                                  *
0018 // * This  code  implementation is the result of  the  scientific and *
0019 // * technical work of the GEANT4 collaboration.                      *
0020 // * By using,  copying,  modifying or  distributing the software (or *
0021 // * any work based  on the software)  you  agree  to acknowledge its *
0022 // * use  in  resulting  scientific  publications,  and indicate your *
0023 // * acceptance of all terms of the Geant4 Software license.          *
0024 // ********************************************************************
0025 //
0026 //
0027 //
0028 // ---------------------------------------------------------------
0029 //
0030 // G4InteractionLawPhysical
0031 //
0032 // Class Description:
0033 //     A G4VBiasingInteractionLaw representing the usual
0034 // physical exponential law, of constant cross-section of the step.
0035 //
0036 // ---------------------------------------------------------------
0037 //   Initial version                         Nov. 2013 M. Verderi
0038
0039 #ifndef G4InteractionLawPhysical_hh
0040 #define G4InteractionLawPhysical_hh 1
0041
0042 #include "G4VBiasingInteractionLaw.hh"
0043
0044 class G4InteractionLawPhysical : public G4VBiasingInteractionLaw
0045 {
0046 public:
0047   G4InteractionLawPhysical(G4String name = "exponentialLaw");
0048   virtual ~G4InteractionLawPhysical();
0049
0050 public:
0051   void     SetPhysicalCrossSection(G4double crossSection);
0052   G4double GetPhysicalCrossSection() const {return fCrossSection;}
0053
0054 public:
0055   virtual G4double     ComputeEffectiveCrossSectionAt(G4double               length) const;
0056   virtual G4double ComputeNonInteractionProbabilityAt(G4double               length) const;
0057   // -- sample the distribution
0058   virtual  G4double           SampleInteractionLength();
0059   // -- move by true path length, this position becomes the new initial point
0060   virtual G4double     UpdateInteractionLengthForStep(G4double       truePathLength);
0061
0062
0063 private:
0064   G4double fCrossSection;
0065   G4bool   fCrossSectionDefined;
0066   G4double fNumberOfInteractionLength;
0067
0068 };
0069
0070 #endif