Double Beta Decay

I trying to simulate a Double Beta Decay event using:
/gun/ion Z A
I have tried different physics lists
and registered the decayphysics:
“physicsList->RegisterPhysics(new G4RadioactiveDecayPhysics);”

the required ion is created but no double beta decay.
any suggestions?

Thanks, Yaacov.

Dear Yaacov,

the Radioactive Decay module does not support double beta decay (either two-neutrino or neutrinoless). This is a very specific topic (also given the variety of mechanisms that can generate the 0nbb decay). So far, I have seen external codes to produce 0nbb or 2n2b events, that are then fed into Geant4 as primary state.