Import Geant4 6.2.0 source tree

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+//
+// ********************************************************************
+// * DISCLAIMER                                                       *
+// *                                                                  *
+// * The following disclaimer summarizes all the specific disclaimers *
+// * of contributors to this software. The specific disclaimers,which *
+// * govern, are listed with their locations in:                      *
+// *   http://cern.ch/geant4/license                                  *
+// *                                                                  *
+// * 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.                                                             *
+// *                                                                  *
+// * This  code  implementation is the  intellectual property  of the *
+// * GEANT4 collaboration.                                            *
+// * By copying,  distributing  or modifying the Program (or any work *
+// * based  on  the Program)  you indicate  your  acceptance of  this *
+// * statement, and all its terms.                                    *
+// ********************************************************************
+//
+//
+// -------------------------------------------------------------------
+//
+// GEANT4 Class file
+//
+//
+// File name:     G4PhotoElectricAngularGeneratorStandard
+//
+// Creation date: 10 May 2004
+//
+// Modifications: 
+// 10 May 2003     P. Rodrigues    First implementation acording with new design
+//
+// Class Description: 
+//
+// Concrete class for PhotoElectric Electron Angular Distribution Generation 
+// This model is a re-implementation of the Photolectric angular distribution
+// developed my M. Maire for the Standard EM Physics G4PhotoElectricEffect 
+//
+// Class Description: End 
+//
+// -------------------------------------------------------------------
+//
+//    
+
+#include "G4PhotoElectricAngularGeneratorStandard.hh"
+#include "Randomize.hh"
+
+//    
+
+G4PhotoElectricAngularGeneratorStandard::G4PhotoElectricAngularGeneratorStandard(const G4String& name):G4VPhotoElectricAngularDistribution(name)
+{;}
+
+//    
+
+G4PhotoElectricAngularGeneratorStandard::~G4PhotoElectricAngularGeneratorStandard() 
+{;}
+
+//
+
+G4ThreeVector G4PhotoElectricAngularGeneratorStandard::GetPhotoElectronDirection(G4ThreeVector direction, G4double eKineticEnergy)
+{
+
+  // Compute Theta distribution of the emitted electron, with respect to the
+  // incident Gamma.
+  // The Sauter-Gavrila distribution for the K-shell is used. (adapted from G4PhotoElectricEffect)
+
+  G4double costeta = 1.;
+  G4double Phi     = twopi * G4UniformRand();
+  G4double cosphi = cos(Phi);
+  G4double sinphi = sin(Phi);
+  G4double sinteta = 0;
+  G4double gamma   = 1. + eKineticEnergy/electron_mass_c2;
+
+  if (gamma > 5.) {
+    G4ThreeVector direction (sinteta*cosphi, sinteta*sinphi, costeta);
+    return costeta;
+  }
+
+  G4double beta  = sqrt(gamma*gamma-1.)/gamma;
+  G4double b     = 0.5*gamma*(gamma-1.)*(gamma-2);
+    
+  G4double rndm,term,greject,grejsup;
+  if (gamma < 2.) grejsup = gamma*gamma*(1.+b-beta*b);
+  else            grejsup = gamma*gamma*(1.+b+beta*b);
+  
+  do { rndm = 1.-2*G4UniformRand();
+       costeta = (rndm+beta)/(rndm*beta+1.);
+       term = 1.-beta*costeta;
+       greject = (1.-costeta*costeta)*(1.+b*term)/(term*term);
+  } while(greject < G4UniformRand()*grejsup);
+       
+
+  sinteta = sqrt(1.-costeta*costeta);
+  G4ThreeVector photoelectrondirection (sinteta*cosphi, sinteta*sinphi, costeta);
+  photoelectrondirection.rotateUz(direction);
+  return photoelectrondirection;
+}
+
+//
+
+void G4PhotoElectricAngularGeneratorStandard::PrintGeneratorInformation() const
+{
+  G4cout << "\n" << G4endl;
+  G4cout << "" << G4endl;
+  G4cout << "Re-implementation of the photolectric angular distribution" << G4endl;
+  G4cout << "developed my M. Maire for the Standard EM Physics G4PhotoElectricEffect" << G4endl;
+  G4cout << "It computes the theta distribution of the emitted electron, with respect to the" << G4endl;
+  G4cout << "incident Gamma, using the Sauter-Gavrila distribution for the K-shell\n" << G4endl;
+}