Import Geant4 8.1.0 source tree

2016-06-09 14:44:26 +02:00
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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: G4DNARutherfordTotalCrossSectionPolicy.icc,v 1.2 2006/06/29 19:35:21 gunter Exp $
+// GEANT4 tag $Name: geant4-08-01 $
+//
+
+#ifdef    G4DNARUTHERFORDTOTALCROSSSECTIONPOLICY_HH
+ #include "G4Electron.hh"
+
+ template <typename EnergyLimitsPolicy>
+ const G4ParticleDefinition            *G4DNARutherfordTotalCrossSectionPolicy<EnergyLimitsPolicy> :: IncomingParticleDefinition(void) const
+ {
+  return G4Electron::Electron();
+ }
+ 
+ 
+ 
+ template <typename EnergyLimitsPolicy>
+ G4double                               G4DNARutherfordTotalCrossSectionPolicy<EnergyLimitsPolicy> :: TotalCrossSection(G4double k, G4int z) const
+ {
+  //                pi * sigma_Ruth(K)
+  // sigma_el(K) = --------------------
+  //                n(K) * (n(K) + 1)
+  //
+  // Where K is the electron non-relativistic kinetic energy
+  // Cross section per water molecule
+
+  if (k < EnergyLimitsPolicy::lowEnergyLimit)
+  {
+   if (EnergyLimitsPolicy::zeroBelowLowEnergyLimit)
+    return 0;
+  
+   k=EnergyLimitsPolicy::lowEnergyLimit;
+  }
+  else if (k > EnergyLimitsPolicy::highEnergyLimit)
+  {
+   if (EnergyLimitsPolicy::zeroAboveHighEnergyLimit)
+    return 0;
+    
+   k=EnergyLimitsPolicy::highEnergyLimit;
+  }
+
+  G4double n=ScreeningFactor(k,z);
+
+  return (pi * RutherfordTotalCrossSection(k, z))/(n*(n+1.));
+ }
+
+
+
+
+
+ template <typename EnergyLimitsPolicy>
+ G4double                               G4DNARutherfordTotalCrossSectionPolicy<EnergyLimitsPolicy> :: RutherfordTotalCrossSection(G4double k, G4int z) const
+ {
+  //                                  e^4         /      K + m_e c^2      \^2
+  // sigma_Ruth(K) = Z (Z+1) -------------------- | --------------------- |
+  //                          (4 pi epsilon_0)^2  \  K * (K + 2 m_e c^2)  /
+  //
+  // Where K is the electron non-relativistic kinetic energy
+  // 
+  // Nucl. Instr. Meth. 155 (1978) 145-156
+
+  G4double length;
+  length=(e_squared*(k+electron_mass_c2))/(4*pi*epsilon0*k*(k+2*electron_mass_c2));
+
+  return static_cast<G4double>(z*(z+1))*length*length;
+ }
+ 
+ 
+ 
+ template <typename EnergyLimitsPolicy>
+ G4double                               G4DNARutherfordTotalCrossSectionPolicy<EnergyLimitsPolicy> :: ScreeningFactor(G4double k, G4int z) const
+ {
+  //
+  //         alpha_1 + beta_1 ln(K/eV)   constK Z^(2/3)
+  // n(T) = -------------------------- -----------------
+  //              K/(m_e c^2)            2 + K/(m_e c^2)
+  //
+  // Where K is the electron non-relativistic kinetic energy
+  //
+  // n(T) > 0 for T < ~ 400 MeV
+  // 
+  // Nucl. Instr. Meth. 155 (1978) 145-156
+
+  const G4double alpha_1(1.64);
+  const G4double beta_1(-0.0825);
+  const G4double constK(1.7E-5);
+
+  G4double numerator;
+  numerator=(alpha_1+beta_1*std::log(k/eV))*constK*std::pow(static_cast<double>(z), 2./3.);
+
+  k/=electron_mass_c2;
+
+  G4double denominator;
+  denominator=k*(2+k);
+
+  return numerator/denominator;
+ }
+
+#endif /* G4DNARUTHERFORDTOTALCROSSSECTIONPOLICY_HH */