G4VPolarizedXS.cc

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//
// File name:     G4VPolarizedXS
//
// Author:        Andreas Schaelicke
//
// Class Description:
//   (virtual) interface class
//   provides readable but efficient routines to determine
//   polarization for the final state of a given process
//   empoying the differential cross section
 
#include "G4VPolarizedXS.hh"
 
#include "Randomize.hh"
 
G4VPolarizedXS::G4VPolarizedXS()
  : fXmin(0)
  , fXmax(1.)
  , fYmin(1.)
  , fA(1.)
  , fZ(1.)
  , fCoul(0.)
{}
 
G4VPolarizedXS::~G4VPolarizedXS() {}
 
void G4VPolarizedXS::Initialize(G4double, G4double, G4double,
                                const G4StokesVector&, const G4StokesVector&,
                                G4int)
{}
 
G4StokesVector G4VPolarizedXS::GetPol2()
{
  // neglects correlation effects!
  G4double invXsecTotal =
    1. / XSection(G4StokesVector::ZERO, G4StokesVector::ZERO);
  G4double xsPol1 = XSection(G4StokesVector::P1, G4StokesVector::ZERO);
  G4double xsPol2 = XSection(G4StokesVector::P2, G4StokesVector::ZERO);
  G4double xsPol3 = XSection(G4StokesVector::P3, G4StokesVector::ZERO);
  return G4StokesVector(G4ThreeVector(
    invXsecTotal * xsPol1, invXsecTotal * xsPol2, invXsecTotal * xsPol3));
}
 
G4StokesVector G4VPolarizedXS::GetPol3()
{
  // neglects correlation effects!
  G4double invXsecTotal =
    1. / XSection(G4StokesVector::ZERO, G4StokesVector::ZERO);
  G4double xsPol1 = XSection(G4StokesVector::ZERO, G4StokesVector::P1);
  G4double xsPol2 = XSection(G4StokesVector::ZERO, G4StokesVector::P2);
  G4double xsPol3 = XSection(G4StokesVector::ZERO, G4StokesVector::P3);
  return G4StokesVector(G4ThreeVector(
    invXsecTotal * xsPol1, invXsecTotal * xsPol2, invXsecTotal * xsPol3));
}
 
// minimal energy fraction in TotalXSection
G4double G4VPolarizedXS::GetXmin(G4double /*y*/) { return fXmin; }
 
// maximal energy fraction in TotalXSection
G4double G4VPolarizedXS::GetXmax(G4double /*y*/) { return fXmax; }
 
G4double G4VPolarizedXS::TotalXSection(G4double, G4double, G4double,
                                       const G4StokesVector&,
                                       const G4StokesVector&)
{
  G4ExceptionDescription ed;
  ed << "WARNING virtual function G4VPolarizedXS::TotalXSection() "
        "called.\n";
  G4Exception("G4VPolarizedXS::TotalXSection", "pol032", FatalException, ed);
  return 0.;
}