Use G4IonTable to support beagle etc

src/dd4pod/plugins/Geant4Output2Podio.cxx

@@ -12,6 +12,7 @@
 #include "CLHEP/Units/SystemOfUnits.h"
 #include "G4ParticleDefinition.hh"
 #include "G4ParticleTable.hh"
+#include "G4IonTable.hh"
 #include "G4Event.hh"
 
 #include "dd4pod/TrackerHitCollection.h"
@@ -173,13 +174,20 @@ namespace dd4hep::sim {
 
     // loop over particle and copy them to podio data model
     for (const auto& [key, part] : pm) {
+      int charge = 0;
+      // particles
       const auto part_def = m_particleTable->FindParticle(part->pdgID);
-      int  charge   = 0;
-      if (part_def == nullptr) {
+      // ions
+      int Z{0}, A{0}, L{0}, J{0};
+      double E{0.};
+      const auto is_ion = G4IonTable::GetNucleusByEncoding(part->pdgID, Z, A, L, E, J);
+      if (part_def != nullptr) {
+        charge = static_cast<int>(std::lround(part_def->GetPDGCharge() / CLHEP::eplus));
+      } else if (is_ion) {
+        charge = Z;
+      } else {
         printout((part->genStatus == 1 ? ERROR : INFO), "Geant4Output2Podio",
                  "++ saveEvent: pdgID %d unknown, charge set to 0", part->pdgID);
-      } else {
-        charge = static_cast<int>(std::lround(part_def->GetPDGCharge() / CLHEP::eplus));
       }
       dd4pod::Geant4Particle podpart{
           part->id,