Cascade gammas from excited 12C

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Hello everyone.

I am trying to create excited 12C nuclei as primary particles, so that I can get the subsequent cascade gammas. I am using GPS and the GRDM. Here are the commands I use:

		UI->ApplyCommand( "/gps/ion 6 12 0 4439" );
		UI->ApplyCommand( "/grdm/nucleusLimits 12 12 6 6" );

When I do this, I get the excited carbon nuclei, but no cascade gammas. In the SteppingAction, I print out the identity of the particles that are created, and then kill the track only if it's a beta or gamma. Here is the output:

	Created a 0-keV C12[4439.0]

If I set the energy state to 4440 keV, the 12C still does not relax to the ground state.

When I try to do the same with excited 137Ba, though (as though from the decay of 137Cs) using the commands

		UI->ApplyCommand( "/gps/ion 56 137 0 662" );
		UI->ApplyCommand( "/grdm/nucleusLimits 137 137 56 56" );

I get the output

	Created a 0-keV Ba137[662.0]
	Created a 661.998-keV gamma
	Created a 0-keV Ba137[0.0]

I get the 662 keV gammas out, and GEANT4 tracks the ground-state barium nucleus.

Does anybody have an idea of how to get the carbon nuclei to properly relax to the ground state?

Thanks for any and all help.