| 1 | // |
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| 2 | // ******************************************************************** |
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| 3 | // * License and Disclaimer * |
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| 4 | // * * |
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| 5 | // * The Geant4 software is copyright of the Copyright Holders of * |
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| 6 | // * the Geant4 Collaboration. It is provided under the terms and * |
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| 7 | // * conditions of the Geant4 Software License, included in the file * |
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| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
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| 9 | // * include a list of copyright holders. * |
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| 10 | // * * |
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| 11 | // * Neither the authors of this software system, nor their employing * |
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| 12 | // * institutes,nor the agencies providing financial support for this * |
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| 13 | // * work make any representation or warranty, express or implied, * |
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| 14 | // * regarding this software system or assume any liability for its * |
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| 15 | // * use. Please see the license in the file LICENSE and URL above * |
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| 16 | // * for the full disclaimer and the limitation of liability. * |
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| 17 | // * * |
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| 18 | // * This code implementation is the result of the scientific and * |
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| 19 | // * technical work of the GEANT4 collaboration. * |
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| 20 | // * By using, copying, modifying or distributing the software (or * |
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| 21 | // * any work based on the software) you agree to acknowledge its * |
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| 22 | // * use in resulting scientific publications, and indicate your * |
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| 23 | // * acceptance of all terms of the Geant4 Software license. * |
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| 24 | // ******************************************************************** |
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| 25 | // |
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| 26 | // ------------------------------------------------------------------- |
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| 27 | // $Id: G4PolarizedAnnihilationCrossSection.hh,v 1.4 2007/11/01 17:32:34 schaelic Exp $ |
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| 28 | // GEANT4 tag $Name: geant4-09-03-cand-01 $ |
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| 29 | // ------------------------------------------------------------------- |
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| 30 | // |
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| 31 | // GEANT4 Class file |
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| 32 | // |
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| 33 | // |
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| 34 | // File name: PolarizedAnnihilationCrossSection |
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| 35 | // |
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| 36 | // Author: Andreas Schaelicke and Pavel Starovoitov |
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| 37 | // |
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| 38 | // Creation date: 22.03.2006 |
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| 39 | // |
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| 40 | // Modifications: |
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| 41 | // 15.10.07 introduced a more general framework for cross sections |
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| 42 | // |
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| 43 | // Class Description: |
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| 44 | // * calculates the differential cross section (ME squared, |
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| 45 | // without phase space) incoming positron (along positive z direction) |
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| 46 | // annihilations with an electron at rest |
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| 47 | // * phi denotes the angle between the scattering plane and |
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| 48 | // X axis of incoming partice reference frame (PRF) |
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| 49 | // |
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| 50 | #ifndef G4PolarizedAnnihilationCrossSection_h |
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| 51 | #define G4PolarizedAnnihilationCrossSection_h 1 |
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| 52 | |
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| 53 | #include "G4StokesVector.hh" |
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| 54 | #include "G4VPolarizedCrossSection.hh" |
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| 55 | |
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| 56 | class G4PolarizedAnnihilationCrossSection : public G4VPolarizedCrossSection |
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| 57 | { |
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| 58 | public: |
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| 59 | G4PolarizedAnnihilationCrossSection(); |
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| 60 | virtual ~G4PolarizedAnnihilationCrossSection(); |
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| 61 | public: |
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| 62 | virtual void Initialize(G4double eps, G4double gamma, G4double phi, |
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| 63 | const G4StokesVector & p0,const G4StokesVector & p1, |
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| 64 | G4int flag=0); |
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| 65 | |
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| 66 | G4double DiceEpsilon(); |
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| 67 | virtual G4double XSection(const G4StokesVector & pol2, |
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| 68 | const G4StokesVector & pol3); |
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| 69 | virtual G4double TotalXSection(G4double xmin, G4double xmax, |
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| 70 | G4double y, |
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| 71 | const G4StokesVector & pol0, |
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| 72 | const G4StokesVector & pol1); |
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| 73 | |
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| 74 | // return expected mean polarisation |
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| 75 | G4StokesVector GetPol2(); |
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| 76 | G4StokesVector GetPol3(); |
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| 77 | |
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| 78 | virtual G4double GetXmin(G4double y); // minimal energy fraction in TotalXSection |
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| 79 | virtual G4double GetXmax(G4double y); // maximal energy fraction in TotalXSection |
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| 80 | |
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| 81 | G4double getVar(G4int ); |
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| 82 | // test routine |
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| 83 | void getCoeff(); |
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| 84 | private: |
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| 85 | void TotalXS(); |
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| 86 | void DefineCoefficients(const G4StokesVector & pol0, |
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| 87 | const G4StokesVector & pol1); |
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| 88 | |
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| 89 | |
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| 90 | G4double polxx, polyy, polzz, polxz, polzx, polxy, polyx, polyz, polzy; |
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| 91 | |
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| 92 | G4double re2, diffXSFactor, totalXSFactor; |
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| 93 | // - unpolarised + part depending on the polarization of the intial pair |
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| 94 | G4double phi0; |
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| 95 | // - part depending on the polarization of the final positron |
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| 96 | G4ThreeVector phi2; |
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| 97 | // - part depending on the polarization of the final electron |
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| 98 | G4ThreeVector phi3; |
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| 99 | G4double dice; |
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| 100 | G4double polXS, unpXS; |
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| 101 | G4double ISPxx, ISPyy, ISPzz, ISPnd; |
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| 102 | }; |
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| 103 | #endif |
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