Import Geant4 8.1.0 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: G4DNAElectronElasticScatteringInWater.icc,v 1.4 2006/06/29 19:34:02 gunter Exp $
+// GEANT4 tag $Name: geant4-08-01 $
+//
+
+#ifdef    G4DNAELECTRONELASTICSCATTERINGINWATER_HH
+ template<typename TotalCrossSectionPolicy, typename FinalStatesPolicy>
+ G4VParticleChange *                      G4DNAElectronElasticScatteringInWater<TotalCrossSectionPolicy, FinalStatesPolicy> :: PostStepDoIt(const G4Track & aTrack, const G4Step & aStep)
+ {
+  this->aParticleChange.Initialize(aTrack);
+  
+  G4double k;
+  k=aTrack.GetDynamicParticle()->GetKineticEnergy();
+ 
+  G4double cosTheta;
+  const G4int z(10); // H2O number of electrons
+  
+  cosTheta=FinalStatesPolicy::RandomizeCosTheta(k, z);
+ 
+  G4double phi;
+  phi=2*pi*G4UniformRand();
+  
+  G4ThreeVector zVers(aTrack.GetDynamicParticle()->GetMomentumDirection());
+  G4ThreeVector xVers(zVers.orthogonal());
+  G4ThreeVector yVers(zVers.cross(xVers));
+  
+  G4double xDir;
+  G4double yDir;
+  
+  xDir=std::sqrt(1-cosTheta*cosTheta);
+  yDir=xDir;
+  xDir*=std::cos(phi);
+  yDir*=std::sin(phi);
+  
+  G4ThreeVector zPrimeVers((xDir*xVers + yDir*yVers + cosTheta*zVers).unit());
+ 
+  this->aParticleChange.ProposeEnergy(k);
+  this->aParticleChange.ProposeMomentumDirection(zPrimeVers);
+  this->aParticleChange.SetNumberOfSecondaries(0);
+  
+  return G4VDNAProcessInWater<TotalCrossSectionPolicy, FinalStatesPolicy>::PostStepDoIt(aTrack, aStep);
+ }
+#endif /* G4DNAELECTRONELASTICSCATTERINGINWATER_HH */