| 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 | // $Id: G4PolarizedPairProductionCrossSection.hh,v 1.3 2007/11/01 17:32:34 schaelic Exp $ |
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| 27 | // GEANT4 tag $Name: geant4-09-02 $ |
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| 28 | // |
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| 29 | // GEANT4 Class file |
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| 30 | // |
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| 31 | // |
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| 32 | // File name: G4PolarizedPairProductionCrossSection |
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| 33 | // |
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| 34 | // Author: Karim Laihem |
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| 35 | // |
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| 36 | // Creation date: 15.05.2005 |
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| 37 | // |
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| 38 | // Modifications: |
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| 39 | // 20-08-06 updated interface to geant4.8.1 (A.Schaelicke) |
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| 40 | // 15-10-07 introduced a more general framework for cross sections (AS) |
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| 41 | // |
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| 42 | // Class Description: |
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| 43 | // determine the polarization of the final state |
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| 44 | // in a Bremsstrahlung scattering process employing the differential |
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| 45 | // cross section by Olsen and Maximon |
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| 46 | // |
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| 47 | #ifndef G4PolarizedPairProductionCrossSection_h |
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| 48 | #define G4PolarizedPairProductionCrossSection_h 1 |
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| 49 | |
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| 50 | #include "G4StokesVector.hh" |
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| 51 | #include "G4VPolarizedCrossSection.hh" |
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| 52 | |
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| 53 | |
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| 54 | class G4PolarizedPairProductionCrossSection : public G4VPolarizedCrossSection |
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| 55 | { |
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| 56 | public: |
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| 57 | G4PolarizedPairProductionCrossSection(); |
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| 58 | virtual void Initialize(G4double eps, G4double X, G4double phi, |
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| 59 | const G4StokesVector & p0, |
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| 60 | const G4StokesVector & p1, |
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| 61 | G4int flag=0); |
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| 62 | virtual G4double XSection(const G4StokesVector & pol2, |
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| 63 | const G4StokesVector & pol3); |
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| 64 | |
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| 65 | // return expected mean polarisation |
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| 66 | G4StokesVector GetPol2(); // electron/positron |
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| 67 | G4StokesVector GetPol3(); // photon |
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| 68 | private: |
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| 69 | |
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| 70 | G4StokesVector theFinalElectronPolarization; |
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| 71 | G4StokesVector theFinalPositronPolarization; |
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| 72 | |
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| 73 | void InitializeMe(); |
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| 74 | |
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| 75 | static G4bool scrnInitialized; |
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| 76 | static G4double SCRN [3][20]; // screening function lookup table; |
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| 77 | }; |
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| 78 | |
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| 79 | #endif |
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