| [819] | 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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| [1007] | 28 | // GEANT4 tag $Name: geant4-09-02 $
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| [819] | 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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