Gabriele Cosmo
62 lines
2.9 KiB
C++
62 lines
2.9 KiB
C++
//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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// G4ILawForceFreeFlight
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//
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// Class Description:
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//
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// A G4VBiasingInteractionLaw representing the "interaction" law
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// for a force free flight, ie, a particle which does not interact.
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// It is a limit case for which the non-interaction probability over
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// a segment is always 1, and the effective cross-section always
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// zero. This singular behavior is signaled by the IsSingular()
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// method returning always true.
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//
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// Author: Marc Verderi, November 2013.
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// --------------------------------------------------------------------
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#ifndef G4ILawForceFreeFlight_hh
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#define G4ILawForceFreeFlight_hh 1
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#include "G4VBiasingInteractionLaw.hh"
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class G4ILawForceFreeFlight : public G4VBiasingInteractionLaw
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{
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public:
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G4ILawForceFreeFlight(const G4String& name = "forceFreeFlightLaw");
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virtual ~G4ILawForceFreeFlight();
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virtual G4double ComputeEffectiveCrossSectionAt(G4double length) const;
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virtual G4double ComputeNonInteractionProbabilityAt(G4double length) const;
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// -- sample the distribution
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virtual G4double SampleInteractionLength();
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// -- move by true path length, this position becomes the new initial point
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virtual G4double UpdateInteractionLengthForStep(G4double truePathLength);
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virtual G4bool IsSingular() const { return true; }
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};
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#endif
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