If I simulate a beam of 150 MeV protons stopping in G4_WATER with RadioactiveDecayPhysics enabled, I encounter the following warning fairly regularly (a few per 100,000 histories):

-------- WWWW ------- G4Exception-START -------- WWWW -------
*** G4Exception : de0001
      issued by : G4AtomicTransitionManager::Shell()
No de-excitation for Z= 3  shellIndex= 2>=  numberOfShells= 2 AtomicShell not found
*** This is just a warning message. ***
-------- WWWW -------- G4Exception-END --------- WWWW -------

I believe the problem is that a radioactive decay process has created an excited lithium nucleus. This cannot be handled by the de-excitation model, which only covers Z>5 && Z<100.

Could we consider removing the warning message for these cases? The issue is that we see hundreds or even thousands of these warnings in a typical medical physics simulation in water. The inability of the model to handle these nuclei will not affect the validity of our results, so we are only concerned about the verbosity of the warnings.

Thanks,
David