| 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: G4VPolarizedCrossSection.hh,v 1.4 2007/11/01 17:32:34 schaelic Exp $
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| 27 | // GEANT4 tag $Name: geant4-09-02-ref-02 $
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| 28 | //
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| 29 | // File name: G4VPolarizedCrossSection
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| 30 | //
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| 31 | // Author: Andreas Schaelicke
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| 32 | //
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| 33 | // Creation date: 15.05.2005
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| 34 | //
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| 35 | // Modifications:
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| 36 | //
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| 37 | // Class Description:
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| 38 | // (pure virtual) interface class
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| 39 | //
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| 40 | // provides readable but efficient routines to determine
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| 41 | // polarization for the final state of a given process
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| 42 | // empoying the differential cross section
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| 43 | //
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| 44 |
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| 45 | #ifndef G4VPolarizedCrossSection_h
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| 46 | #define G4VPolarizedCrossSection_h 1
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| 47 |
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| 48 | #include "G4StokesVector.hh"
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| 49 |
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| 50 |
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| 51 | class G4VPolarizedCrossSection
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| 52 | {
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| 53 | public:
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| 54 | G4VPolarizedCrossSection();
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| 55 | virtual ~G4VPolarizedCrossSection();
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| 56 |
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| 57 | public:
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| 58 | virtual void Initialize(G4double, G4double, G4double,
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| 59 | const G4StokesVector & p0,const G4StokesVector & p1,
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| 60 | G4int flag=0);
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| 61 | virtual G4double XSection(const G4StokesVector & pol2,const G4StokesVector & pol3) = 0;
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| 62 | virtual G4double TotalXSection(G4double xmin, G4double xmax, G4double y,
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| 63 | const G4StokesVector & pol0,
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| 64 | const G4StokesVector & pol1);
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| 65 |
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| 66 | // return expected mean polarisation
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| 67 | virtual G4StokesVector GetPol2();
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| 68 | virtual G4StokesVector GetPol3();
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| 69 |
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| 70 | // return basic kinematics properties
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| 71 | // minimal gamma value in TotalXSection
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| 72 | inline G4double GetYmin() {return fYmin; }
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| 73 | // minimal energy fraction in TotalXSection
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| 74 | virtual G4double GetXmin(G4double y);
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| 75 | // maximal energy fraction in TotalXSection
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| 76 | virtual G4double GetXmax(G4double y);
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| 77 |
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| 78 | // return appropriate distribute polarisation states;
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| 79 | // void DicePolarization();
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| 80 | // G4StokesVector DicedPol2();
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| 81 | // G4StokesVector DicedPol3();
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| 82 | inline void SetMaterial(G4double A, G4double Z, G4double coul)
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| 83 | { theA=A; theZ=Z; fCoul=coul; }
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| 84 | protected:
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| 85 | // define kinematics properties
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| 86 | inline void SetXmin(G4double xmin) { fXmin=xmin;}
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| 87 | inline void SetXmax(G4double xmax) { fXmax=xmax;}
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| 88 | inline void SetYmin(G4double ymin) { fYmin=ymin;}
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| 89 |
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| 90 | // kinematic properties
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| 91 | G4double fXmin, fXmax, fYmin;
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| 92 | // material properties
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| 93 | G4double theA, theZ;
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| 94 | G4double fCoul;
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| 95 | };
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| 96 |
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| 97 |
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| 98 | #endif
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