write PDG code in TrackWriter instead of name

Processes/TrackWriter/TrackWriter.cc

@@ -37,9 +37,9 @@ namespace corsika::process::track_writer {
     using namespace units::si;
     auto const start = vT.GetPosition(0).GetCoordinates();
     auto const delta = vT.GetPosition(1).GetCoordinates() - start;
-    auto const& name = particles::GetName(vP.GetPID());
+    auto const pdg = static_cast<int>(particles::GetPDG(vP.GetPID()));
 
-    fFile << name << "    " << vP.GetEnergy() / 1_eV << ' ' << start[0] / 1_m << ' '
+    fFile << pdg << ' ' << vP.GetEnergy() / 1_eV << ' ' << start[0] / 1_m << ' '
           << start[1] / 1_m << ' ' << start[2] / 1_m << "   " << delta[0] / 1_m << ' '
           << delta[1] / 1_m << ' ' << delta[2] / 1_m << '\n';