G4DeltaAngleFreeScat.cc

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// $Id: G4DeltaAngleFreeScat.cc 68380 2013-03-22 18:39:29Z vnivanch $
//
// -------------------------------------------------------------------
//
// GEANT4 Class file
//
//
// File name:     G4DeltaAngleFreeScat
//
// Author:        Vladimir Ivantcheko
// 
// Creation date: 23 August 2013
//
// Modifications: 
//
// Class Description: 
//
// Delta-electron Angular Distribution Generation 
//
// Class Description: End 
//
// -------------------------------------------------------------------
//

#include "G4DeltaAngleFreeScat.hh"
#include "G4PhysicalConstants.hh"
#include "Randomize.hh"

using namespace std;

G4DeltaAngleFreeScat::G4DeltaAngleFreeScat(const G4String&)
  : G4VEmAngularDistribution("deltaFree")
{}    

G4DeltaAngleFreeScat::~G4DeltaAngleFreeScat() 
{}

G4ThreeVector& 
G4DeltaAngleFreeScat::SampleDirection(const G4DynamicParticle* dp,
            G4double kinEnergyFinal, G4int, 
            const G4Material*)
{
  G4double deltaMomentum = 
    sqrt(kinEnergyFinal*(kinEnergyFinal + 2*electron_mass_c2));

  G4double costet = kinEnergyFinal*(dp->GetTotalEnergy() + electron_mass_c2) /
    (deltaMomentum * dp->GetTotalMomentum());

  G4double phi = G4UniformRand()*twopi;
  G4double sintet = sqrt((1 - costet)*(1 + costet));
 
  fLocalDirection.set(sintet*cos(phi), sintet*sin(phi), costet);
  fLocalDirection.rotateUz(dp->GetMomentumDirection());

  return fLocalDirection;
}

void G4DeltaAngleFreeScat::PrintGeneratorInformation() const
{}