First decay study of the very neutron-rich isotope Br-93 - art. no. 034316

The decay of the mass-separated, very neutron-rich isotope Br-93 has been s tudied by gamma spectroscopy. A level scheme of its daughter Kr-93 has been constructed, Level energies, gamma -ray branching ratios, and multipolarit ies suggest spins and parities which are in accord with a smooth systematic s of the N = 57 isotones for Z less than or equal to 40, suggesting the N=5 6 subshell closure still to be effective in Kr isotopes. So far, there is n o indication of a progressive onset of deformation in neutron-rich Kr isoto pes.