Import Geant4 10.0.0 source tree

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+//
+// ********************************************************************
+// * License and Disclaimer                                           *
+// *                                                                  *
+// * The  Geant4 software  is  copyright of the Copyright Holders  of *
+// * the Geant4 Collaboration.  It is provided  under  the terms  and *
+// * conditions of the Geant4 Software License,  included in the file *
+// * LICENSE and available at  http://cern.ch/geant4/license .  These *
+// * include a list of copyright holders.                             *
+// *                                                                  *
+// * Neither the authors of this software system, nor their employing *
+// * institutes,nor the agencies providing financial support for this *
+// * work  make  any representation or  warranty, express or implied, *
+// * regarding  this  software system or assume any liability for its *
+// * use.  Please see the license in the file  LICENSE  and URL above *
+// * for the full disclaimer and the limitation of liability.         *
+// *                                                                  *
+// * This  code  implementation is the result of  the  scientific and *
+// * technical work of the GEANT4 collaboration.                      *
+// * By using,  copying,  modifying or  distributing the software (or *
+// * any work based  on the software)  you  agree  to acknowledge its *
+// * use  in  resulting  scientific  publications,  and indicate your *
+// * acceptance of all terms of the Geant4 Software license.          *
+// ********************************************************************
+//
+//
+// $Id: $
+//
+// ---------------------------------------------------------------
+//
+// G4InteractionLawPhysical
+//
+// Class Description:
+//     A G4VBiasingInteractionLaw representing the usual
+// physical exponential law, of constant cross-section of the step.
+//
+// ---------------------------------------------------------------
+//   Initial version                         Nov. 2013 M. Verderi
+
+#ifndef G4InteractionLawPhysical_hh
+#define G4InteractionLawPhysical_hh 1
+
+#include "G4VBiasingInteractionLaw.hh"
+
+class G4InteractionLawPhysical : public G4VBiasingInteractionLaw
+{
+public:
+  G4InteractionLawPhysical(G4String name = "exponentialLaw");
+  virtual ~G4InteractionLawPhysical();
+
+public:
+  void     SetPhysicalCrossSection(G4double crossSection);
+  G4double GetPhysicalCrossSection() const {return fCrossSection;}
+  
+public:
+  virtual G4double     ComputeEffectiveCrossSectionAt(G4double               length) const;
+  virtual G4double ComputeNonInteractionProbabilityAt(G4double               length) const;
+  // -- sample the distribution
+  virtual  G4double           SampleInteractionLength();
+  // -- move by true path length, this position becomes the new initial point
+  virtual G4double     UpdateInteractionLengthForStep(G4double       truePathLength);
+
+
+private:
+  G4double fCrossSection;
+  G4bool   fCrossSectionDefined;
+  G4double fNumberOfInteractionLength;
+
+};
+
+#endif