Import Geant4 7.1.0 source tree

2016-06-09 12:11:21 +02:00
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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.                                    *
+// ********************************************************************
+//
+// $Id: G4PEEffectModel.cc,v 1.2 2005/05/02 12:44:18 maire Exp $
+// GEANT4 tag $Name: geant4-07-01 $
+//
+// -------------------------------------------------------------------
+//
+// GEANT4 Class file
+//
+//
+// File name:     G4PEEffectModel
+//
+// Author:        Vladimir Ivanchenko on base of Michel Maire code
+//
+// Creation date: 21.03.2005
+//
+// Modifications:
+//
+// Class Description:
+//
+// -------------------------------------------------------------------
+//
+//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
+//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
+
+#include "G4PEEffectModel.hh"
+#include "G4Electron.hh"
+#include "G4Gamma.hh"
+#include "Randomize.hh"
+#include "G4DataVector.hh"
+#include "G4ParticleChangeForGamma.hh"
+
+//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
+
+using namespace std;
+
+G4PEEffectModel::G4PEEffectModel(const G4ParticleDefinition*,
+					 const G4String& nam)
+  : G4VEmModel(nam),isInitialized(false)
+{
+  theGamma    = G4Gamma::Gamma();
+  theElectron = G4Electron::Electron();
+}
+
+//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
+
+G4PEEffectModel::~G4PEEffectModel()
+{
+}
+
+//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
+
+void G4PEEffectModel::Initialise(const G4ParticleDefinition*,
+				 const G4DataVector&)
+{
+  if(isInitialized) return;
+  if(pParticleChange)
+    fParticleChange = reinterpret_cast<G4ParticleChangeForGamma*>(pParticleChange);
+  else
+    fParticleChange = new G4ParticleChangeForGamma();
+
+  fminimalEnergy = 1.0*eV;
+}
+
+//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
+
+std::vector<G4DynamicParticle*>* G4PEEffectModel::SampleSecondaries(
+                             const G4MaterialCutsCouple* couple,
+                             const G4DynamicParticle* aDynamicPhoton,
+                                   G4double,
+                                   G4double)
+{
+  const G4Material* aMaterial = couple->GetMaterial();
+
+  G4double energy = aDynamicPhoton->GetKineticEnergy();
+  G4ParticleMomentum PhotonDirection = aDynamicPhoton->GetMomentumDirection();
+
+  // select randomly one element constituing the material.
+  const G4Element* anElement = SelectRandomAtom(aMaterial,theGamma,energy);
+  
+  //
+  // Photo electron
+  //
+  std::vector<G4DynamicParticle*>* fvect = new std::vector<G4DynamicParticle*>;
+
+  // Select atomic shell
+  G4int nShells = anElement->GetNbOfAtomicShells();
+  G4int i  = 0;  
+  while ((i<nShells) && (energy<anElement->GetAtomicShell(i))) i++;
+
+  // no shell available
+  if (i == nShells) return fvect;
+  
+  G4double bindingEnergy  = anElement->GetAtomicShell(i);
+  G4double ElecKineEnergy = energy - bindingEnergy;
+
+  if (ElecKineEnergy > fminimalEnergy)
+    {
+     // direction of the photo electron
+     //
+     G4double cosTeta = ElecCosThetaDistribution(ElecKineEnergy);
+     G4double sinTeta = sqrt(1.-cosTeta*cosTeta);
+     G4double Phi     = twopi * G4UniformRand();
+     G4double dirx = sinTeta*cos(Phi),diry = sinTeta*sin(Phi),dirz = cosTeta;
+     G4ThreeVector ElecDirection(dirx,diry,dirz);
+     ElecDirection.rotateUz(PhotonDirection);
+     //
+     G4DynamicParticle* aParticle = new G4DynamicParticle (
+                       theElectron,ElecDirection, ElecKineEnergy);
+     fvect->push_back(aParticle);
+    }
+
+  fParticleChange->ProposeTrackStatus(fStopAndKill);   
+  fParticleChange->ProposeLocalEnergyDeposit(bindingEnergy);
+  return fvect;
+}
+
+//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
+
+G4double G4PEEffectModel::ElecCosThetaDistribution(G4double kineEnergy)
+{
+  // Compute Theta distribution of the emitted electron, with respect to the
+  // incident Gamma.
+  // The Sauter-Gavrila distribution for the K-shell is used.
+  //
+  G4double costeta = 1.;
+  G4double gamma   = 1. + kineEnergy/electron_mass_c2;
+  if (gamma > 5.) 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);
+
+  return costeta;
+}
+
+//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......