Hindered or favoured transitions have been experimentally detected in
cluster radioactivity of odd-mass nuclei, in a similar way to what has
been previously observed in spontaneous fission or in the fine struct
ure of alpha-decay. By combining the experimental study with a suitabl
e theoretical description one can develop a powerful method to get dir
ect spectroscopic informations on the deformed states of emitting nucl
ei. We are analyzing the possibility to explain within a superasymmetr
ic fission model why the C-14 transition from Ra-223 toward the first
excited state of (209)pb is stronger than that toward its ground state
.