Import Geant4 11.3.0 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.          *
+// ********************************************************************
+//
+//
+// -------------------------------------------------------------------
+//
+// GEANT4 Class header file
+//
+//
+// File name:     G4eplusTo2or3GammaModel
+//
+// Author:        Vladimir Ivanchenko and Omrane Kadri 
+//
+// Creation date: 29.03.2018
+//
+//
+// Class Description:
+//
+// Implementation of e+ annihilation into 2 or 3 gamma on fly
+// Annihilation at rest is sampled by G4VPositronAtRestModel
+// Implementation of 3-gamma annihilation is performed by
+// G4eplusTo3GammaOKVIModel. Cross section of both models
+// depend on cut parameter fDelta, which defines relative low-energy
+// limit on 3d gamma energy. For computation of the cross section
+// next to leading order radiative corrections are taken into account,
+// atomic effects at low-energy are not considered.
+//
+// V.N.Baier, V.S. Fadin, V.A. Khose, E.A. Kuraev,
+// Physics Reports 78 (1981) 293-393.
+//
+// -------------------------------------------------------------------
+//
+
+#ifndef G4eplusTo2or3GammaModel_h
+#define G4eplusTo2or3GammaModel_h 1
+
+#include "G4VEmModel.hh"
+
+class G4eplusTo3GammaOKVIModel;
+class G4ParticleChangeForGamma;
+class G4PhysicsVector;
+class G4DataVector;
+
+class G4eplusTo2or3GammaModel : public G4VEmModel
+{
+
+public:
+
+  G4eplusTo2or3GammaModel();
+
+  ~G4eplusTo2or3GammaModel() override;
+
+  void Initialise(const G4ParticleDefinition*, const G4DataVector&) override;
+
+  G4double ComputeCrossSectionPerElectron(G4double kinEnergy); 
+  
+  G4double ComputeCrossSectionPerAtom(
+                                 const G4ParticleDefinition*,
+                                 G4double kinEnergy, 
+                                 G4double Z, 
+                                 G4double A = 0., 
+                                 G4double cutEnergy = 0.,
+                                 G4double maxEnergy = DBL_MAX) override;
+
+  G4double CrossSectionPerVolume(const G4Material*,
+				 const G4ParticleDefinition*,
+				 G4double kineticEnergy,
+				 G4double cutEnergy = 0.0,
+				 G4double maxEnergy = DBL_MAX) override;
+
+  void SampleSecondaries(std::vector<G4DynamicParticle*>*,
+				 const G4MaterialCutsCouple*,
+				 const G4DynamicParticle*,
+				 G4double tmin = 0.0,
+				 G4double maxEnergy = DBL_MAX) override;
+
+  void SetDelta(G4double val) { if(val > 0.0) { fDeltaMin = val; } };
+
+  // hide assignment operator
+  G4eplusTo2or3GammaModel & operator=
+  (const  G4eplusTo2or3GammaModel &right) = delete;
+  G4eplusTo2or3GammaModel(const  G4eplusTo2or3GammaModel&) = delete;
+
+private:
+
+  const G4ParticleDefinition* theGamma;
+  G4ParticleChangeForGamma* fParticleChange;
+  G4eplusTo3GammaOKVIModel* f3GModel;
+
+  G4double fDeltaMin; // fixed minimal relative limit
+  G4double fDelta;    // running limit - function of energy
+  G4double fGammaTh;  // 3-gamma annihilation low-energy limit
+
+  static G4PhysicsVector* fCrossSection;
+  static G4PhysicsVector* f3GProbability;
+};
+
+//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
+
+#endif