00001 // 00002 // ******************************************************************** 00003 // * License and Disclaimer * 00004 // * * 00005 // * The Geant4 software is copyright of the Copyright Holders of * 00006 // * the Geant4 Collaboration. It is provided under the terms and * 00007 // * conditions of the Geant4 Software License, included in the file * 00008 // * LICENSE and available at http://cern.ch/geant4/license . These * 00009 // * include a list of copyright holders. * 00010 // * * 00011 // * Neither the authors of this software system, nor their employing * 00012 // * institutes,nor the agencies providing financial support for this * 00013 // * work make any representation or warranty, express or implied, * 00014 // * regarding this software system or assume any liability for its * 00015 // * use. Please see the license in the file LICENSE and URL above * 00016 // * for the full disclaimer and the limitation of liability. * 00017 // * * 00018 // * This code implementation is the result of the scientific and * 00019 // * technical work of the GEANT4 collaboration. * 00020 // * By using, copying, modifying or distributing the software (or * 00021 // * any work based on the software) you agree to acknowledge its * 00022 // * use in resulting scientific publications, and indicate your * 00023 // * acceptance of all terms of the Geant4 Software license. * 00024 // ******************************************************************** 00025 // 00026 // ------------------------------------------------------------------- 00027 // $Id: G4PolarizedAnnihilationCrossSection.hh 69847 2013-05-16 09:36:18Z gcosmo $ 00028 // ------------------------------------------------------------------- 00029 // 00030 // GEANT4 Class file 00031 // 00032 // 00033 // File name: PolarizedAnnihilationCrossSection 00034 // 00035 // Author: Andreas Schaelicke and Pavel Starovoitov 00036 // 00037 // Creation date: 22.03.2006 00038 // 00039 // Modifications: 00040 // 15.10.07 introduced a more general framework for cross sections 00041 // 00042 // Class Description: 00043 // * calculates the differential cross section (ME squared, 00044 // without phase space) incoming positron (along positive z direction) 00045 // annihilations with an electron at rest 00046 // * phi denotes the angle between the scattering plane and 00047 // X axis of incoming partice reference frame (PRF) 00048 // 00049 #ifndef G4PolarizedAnnihilationCrossSection_h 00050 #define G4PolarizedAnnihilationCrossSection_h 1 00051 00052 #include "G4StokesVector.hh" 00053 #include "G4VPolarizedCrossSection.hh" 00054 00055 class G4PolarizedAnnihilationCrossSection : public G4VPolarizedCrossSection 00056 { 00057 public: 00058 G4PolarizedAnnihilationCrossSection(); 00059 virtual ~G4PolarizedAnnihilationCrossSection(); 00060 public: 00061 virtual void Initialize(G4double eps, G4double gamma, G4double phi, 00062 const G4StokesVector & p0,const G4StokesVector & p1, 00063 G4int flag=0); 00064 00065 G4double DiceEpsilon(); 00066 virtual G4double XSection(const G4StokesVector & pol2, 00067 const G4StokesVector & pol3); 00068 virtual G4double TotalXSection(G4double xmin, G4double xmax, 00069 G4double y, 00070 const G4StokesVector & pol0, 00071 const G4StokesVector & pol1); 00072 00073 // return expected mean polarisation 00074 G4StokesVector GetPol2(); 00075 G4StokesVector GetPol3(); 00076 00077 virtual G4double GetXmin(G4double y); // minimal energy fraction in TotalXSection 00078 virtual G4double GetXmax(G4double y); // maximal energy fraction in TotalXSection 00079 00080 G4double getVar(G4int ); 00081 // test routine 00082 void getCoeff(); 00083 private: 00084 void TotalXS(); 00085 void DefineCoefficients(const G4StokesVector & pol0, 00086 const G4StokesVector & pol1); 00087 00088 00089 G4double polxx, polyy, polzz, polxz, polzx, polxy, polyx, polyz, polzy; 00090 00091 G4double re2, diffXSFactor, totalXSFactor; 00092 // - unpolarised + part depending on the polarization of the intial pair 00093 G4double phi0; 00094 // - part depending on the polarization of the final positron 00095 G4ThreeVector phi2; 00096 // - part depending on the polarization of the final electron 00097 G4ThreeVector phi3; 00098 G4double dice; 00099 G4double polXS, unpXS; 00100 G4double ISPxx, ISPyy, ISPzz, ISPnd; 00101 }; 00102 #endif