Gabriele Cosmo
107 lines
4.2 KiB
C++
107 lines
4.2 KiB
C++
//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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// -------------------------------------------------------------------
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//
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// Geant4 Class file
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//
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// File name: G4PolarizedAnnihilationXS
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//
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// Author: Andreas Schaelicke and Pavel Starovoitov
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//
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// Class Description:
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// * calculates the differential cross section (ME squared,
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// without phase space) incoming positron (along positive z direction)
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// annihilations with an electron at rest
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// * phi denotes the angle between the scattering plane and
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// X axis of incoming partice reference frame (PRF)
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#ifndef G4PolarizedAnnihilationXS_h
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#define G4PolarizedAnnihilationXS_h 1
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#include "G4StokesVector.hh"
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#include "G4VPolarizedXS.hh"
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class G4PolarizedAnnihilationXS : public G4VPolarizedXS
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{
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public:
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G4PolarizedAnnihilationXS();
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virtual ~G4PolarizedAnnihilationXS() override;
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virtual void Initialize(G4double eps, G4double gamma, G4double phi,
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const G4StokesVector& p0, const G4StokesVector& p1,
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G4int flag = 0) override;
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G4double DiceEpsilon();
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virtual G4double XSection(const G4StokesVector& pol2,
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const G4StokesVector& pol3) override;
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virtual G4double TotalXSection(G4double xmin, G4double xmax, G4double y,
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const G4StokesVector& pol0,
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const G4StokesVector& pol1) override;
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// return expected mean polarisation
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virtual G4StokesVector GetPol2() override;
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virtual G4StokesVector GetPol3() override;
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// minimal energy fraction in TotalXSection
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virtual G4double GetXmin(G4double y) override;
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// maximal energy fraction in TotalXSection
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virtual G4double GetXmax(G4double y) override;
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G4double getVar(G4int);
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// test routine
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void getCoeff();
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G4PolarizedAnnihilationXS& operator=(const G4PolarizedAnnihilationXS& right) =
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delete;
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G4PolarizedAnnihilationXS(const G4PolarizedAnnihilationXS&) = delete;
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private:
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void TotalXS();
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void DefineCoefficients(const G4StokesVector& pol0,
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const G4StokesVector& pol1);
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static constexpr G4double re2 =
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CLHEP::classic_electr_radius * CLHEP::classic_electr_radius;
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// - part depending on the polarization of the final positron
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G4ThreeVector fPhi2;
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// - part depending on the polarization of the final electron
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G4ThreeVector fPhi3;
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G4double polxx, polyy, polzz, polxz, polzx, polxy, polyx, polyz, polzy;
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// - unpolarised + part depending on the polarization of the initial pair
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G4double fPhi0;
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G4double fDice;
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G4double fPolXS, fUnpXS;
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G4double ISPxx, ISPyy, ISPzz, ISPnd;
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};
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#endif
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