Import Geant4 9.2.0 source tree

2016-06-09 15:58:43 +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: G4CrossSectionElasticScreenedRutherfordLE.cc,v 1.2 2008/07/14 20:47:34 sincerti Exp $
+// GEANT4 tag $Name: geant4-09-02 $
+
+#include "G4CrossSectionElasticScreenedRutherfordLE.hh"
+
+//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
+
+G4CrossSectionElasticScreenedRutherfordLE::G4CrossSectionElasticScreenedRutherfordLE()
+{
+  lowEnergyLimit = 0 * eV; 
+  highEnergyLimit = 200 * eV;
+}
+
+//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
+
+G4CrossSectionElasticScreenedRutherfordLE::~G4CrossSectionElasticScreenedRutherfordLE()
+{}
+ 
+//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
+
+G4double G4CrossSectionElasticScreenedRutherfordLE::CrossSection(const G4Track& track)
+{
+  const G4DynamicParticle* particle = track.GetDynamicParticle();
+  G4double k = particle->GetKineticEnergy();
+
+  G4double screenedCrossSection = 0.;
+
+  if (k > lowEnergyLimit && k <= highEnergyLimit)
+  {      
+      G4double z = 10.;
+      G4double n = ScreeningFactor(k,z);
+      G4double crossSection = RutherfordCrossSection(k, z);
+      screenedCrossSection = pi *  crossSection / (n * (n + 1.));
+  }    
+
+  return screenedCrossSection;
+}
+  
+//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
+
+G4double G4CrossSectionElasticScreenedRutherfordLE::RutherfordCrossSection(G4double k, G4double z)
+{
+  //   
+  //                               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
+  // 
+  // NIM 155, pp. 145-156, 1978
+  
+  G4double length =(e_squared * (k + electron_mass_c2)) / (4 * pi *epsilon0 * k * ( k + 2 * electron_mass_c2));
+  G4double cross = z * ( z + 1) * length * length;
+  
+  return cross;
+}
+
+//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
+
+G4double G4CrossSectionElasticScreenedRutherfordLE::ScreeningFactor(G4double k, G4double z)
+{
+  //
+  //         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
+  // 
+  // NIM 155, pp. 145-156, 1978
+  // Formulae (2) and (5)
+
+  const G4double alpha_1(1.64);
+  const G4double beta_1(-0.0825);
+  const G4double constK(1.7E-5);
+
+  G4double numerator = (alpha_1 + beta_1 * std::log(k/eV)) * constK * std::pow(z, 2./3.);
+
+  k /= electron_mass_c2;
+
+  G4double denominator = k * (2 + k);
+
+  G4double value = 0.;
+  if (denominator > 0.) value = numerator / denominator;
+
+  return value;
+}