1 | // |
---|
2 | // ******************************************************************** |
---|
3 | // * License and Disclaimer * |
---|
4 | // * * |
---|
5 | // * The Geant4 software is copyright of the Copyright Holders of * |
---|
6 | // * the Geant4 Collaboration. It is provided under the terms and * |
---|
7 | // * conditions of the Geant4 Software License, included in the file * |
---|
8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
---|
9 | // * include a list of copyright holders. * |
---|
10 | // * * |
---|
11 | // * Neither the authors of this software system, nor their employing * |
---|
12 | // * institutes,nor the agencies providing financial support for this * |
---|
13 | // * work make any representation or warranty, express or implied, * |
---|
14 | // * regarding this software system or assume any liability for its * |
---|
15 | // * use. Please see the license in the file LICENSE and URL above * |
---|
16 | // * for the full disclaimer and the limitation of liability. * |
---|
17 | // * * |
---|
18 | // * This code implementation is the result of the scientific and * |
---|
19 | // * technical work of the GEANT4 collaboration. * |
---|
20 | // * By using, copying, modifying or distributing the software (or * |
---|
21 | // * any work based on the software) you agree to acknowledge its * |
---|
22 | // * use in resulting scientific publications, and indicate your * |
---|
23 | // * acceptance of all terms of the Geant4 Software license. * |
---|
24 | // ******************************************************************** |
---|
25 | // |
---|
26 | // ------------------------------------------------------------------- |
---|
27 | // $Id: G4PolarizedAnnihilationCrossSection.hh,v 1.4 2007/11/01 17:32:34 schaelic Exp $ |
---|
28 | // GEANT4 tag $Name: geant4-09-02-ref-02 $ |
---|
29 | // ------------------------------------------------------------------- |
---|
30 | // |
---|
31 | // GEANT4 Class file |
---|
32 | // |
---|
33 | // |
---|
34 | // File name: PolarizedAnnihilationCrossSection |
---|
35 | // |
---|
36 | // Author: Andreas Schaelicke and Pavel Starovoitov |
---|
37 | // |
---|
38 | // Creation date: 22.03.2006 |
---|
39 | // |
---|
40 | // Modifications: |
---|
41 | // 15.10.07 introduced a more general framework for cross sections |
---|
42 | // |
---|
43 | // Class Description: |
---|
44 | // * calculates the differential cross section (ME squared, |
---|
45 | // without phase space) incoming positron (along positive z direction) |
---|
46 | // annihilations with an electron at rest |
---|
47 | // * phi denotes the angle between the scattering plane and |
---|
48 | // X axis of incoming partice reference frame (PRF) |
---|
49 | // |
---|
50 | #ifndef G4PolarizedAnnihilationCrossSection_h |
---|
51 | #define G4PolarizedAnnihilationCrossSection_h 1 |
---|
52 | |
---|
53 | #include "G4StokesVector.hh" |
---|
54 | #include "G4VPolarizedCrossSection.hh" |
---|
55 | |
---|
56 | class G4PolarizedAnnihilationCrossSection : public G4VPolarizedCrossSection |
---|
57 | { |
---|
58 | public: |
---|
59 | G4PolarizedAnnihilationCrossSection(); |
---|
60 | virtual ~G4PolarizedAnnihilationCrossSection(); |
---|
61 | public: |
---|
62 | virtual void Initialize(G4double eps, G4double gamma, G4double phi, |
---|
63 | const G4StokesVector & p0,const G4StokesVector & p1, |
---|
64 | G4int flag=0); |
---|
65 | |
---|
66 | G4double DiceEpsilon(); |
---|
67 | virtual G4double XSection(const G4StokesVector & pol2, |
---|
68 | const G4StokesVector & pol3); |
---|
69 | virtual G4double TotalXSection(G4double xmin, G4double xmax, |
---|
70 | G4double y, |
---|
71 | const G4StokesVector & pol0, |
---|
72 | const G4StokesVector & pol1); |
---|
73 | |
---|
74 | // return expected mean polarisation |
---|
75 | G4StokesVector GetPol2(); |
---|
76 | G4StokesVector GetPol3(); |
---|
77 | |
---|
78 | virtual G4double GetXmin(G4double y); // minimal energy fraction in TotalXSection |
---|
79 | virtual G4double GetXmax(G4double y); // maximal energy fraction in TotalXSection |
---|
80 | |
---|
81 | G4double getVar(G4int ); |
---|
82 | // test routine |
---|
83 | void getCoeff(); |
---|
84 | private: |
---|
85 | void TotalXS(); |
---|
86 | void DefineCoefficients(const G4StokesVector & pol0, |
---|
87 | const G4StokesVector & pol1); |
---|
88 | |
---|
89 | |
---|
90 | G4double polxx, polyy, polzz, polxz, polzx, polxy, polyx, polyz, polzy; |
---|
91 | |
---|
92 | G4double re2, diffXSFactor, totalXSFactor; |
---|
93 | // - unpolarised + part depending on the polarization of the intial pair |
---|
94 | G4double phi0; |
---|
95 | // - part depending on the polarization of the final positron |
---|
96 | G4ThreeVector phi2; |
---|
97 | // - part depending on the polarization of the final electron |
---|
98 | G4ThreeVector phi3; |
---|
99 | G4double dice; |
---|
100 | G4double polXS, unpXS; |
---|
101 | G4double ISPxx, ISPyy, ISPzz, ISPnd; |
---|
102 | }; |
---|
103 | #endif |
---|