G4SimplePositronAtRestModel.cc

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//
// GEANT4 Class file
//
//
// File name:     G4SimplePositronAtRestModel
//
// Author:        Vladimir Ivanchenko
// 
// Creation date: 14 May 2024
//
// -------------------------------------------------------------------
//
 
#include "G4SimplePositronAtRestModel.hh"
#include "G4DynamicParticle.hh"
#include "G4Material.hh"
#include "Randomize.hh"
#include "G4Gamma.hh"
#include "G4RandomDirection.hh"
#include "G4ThreeVector.hh"
#include "G4PhysicalConstants.hh"
#include "G4SystemOfUnits.hh"
 
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G4SimplePositronAtRestModel::G4SimplePositronAtRestModel()
  : G4VPositronAtRestModel("Simple")
{}    
 
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void G4SimplePositronAtRestModel::SampleSecondaries(
             std::vector<G4DynamicParticle*>& secParticles,
             G4double&, const G4Material*) const
{
  G4ThreeVector dir1 = G4RandomDirection();
  auto aGamma1 = new G4DynamicParticle(G4Gamma::Gamma(), dir1,
                       CLHEP::electron_mass_c2);
  G4double phi = CLHEP::twopi * G4UniformRand();
  G4double cosphi = std::cos(phi);
  G4double sinphi = std::sin(phi);
  G4ThreeVector pol1(cosphi, sinphi, 0.0);
  pol1.rotateUz(dir1);
  aGamma1->SetPolarization(pol1);
  secParticles.push_back(aGamma1);
 
  G4ThreeVector dir2 = -dir1;
  auto aGamma2 = new G4DynamicParticle(G4Gamma::Gamma(), dir2,
                       CLHEP::electron_mass_c2);
  G4ThreeVector pol2(-sinphi, cosphi, 0.0);
  pol2.rotateUz(dir1);
  aGamma2->SetPolarization(pol2);
  secParticles.push_back(aGamma2);  
}
 
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void G4SimplePositronAtRestModel::PrintGeneratorInformation() const
{
  G4cout << "\n" << G4endl;
  G4cout << "Simple AtRest positron 2-gamma annihilation model" << G4endl;
} 
 
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