The decay of the very neutron-rich nucleus Rb-100 has been studied by gamma
spectroscopy of online mass separated samples. Schemes for beta decay to S
r-100 and betan decay to Sr-99 are presented. New sets of transitions in Sr
-99 and Sr-100 with identical energies are observed. All identical bands so
far observed in neutron-rich Sr isotopes obey a simple energy rule valid f
or even-even, odd-even, and odd-odd bands.