First decay study of the very neutron-rich isotope Br-93
  The decay of the mass-separated, very neutron-rich isotope Br-93 has been studied by gamma-spectroscopy. A level scheme of its daughter Kr-93 has been constructed. Level energies, gamma-ray branching ratios and multipolarities suggest spins and parities which are in accord with a smooth systematics of the N=57 isotones for Z less-equal 40, suggesting the N=56 shell closure still to be effective in Kr isotopes. So far, there is no indication of a progressive onset of deformation in neutron-rich Kr isotopes. 
G. Lhersonneau (Inst. f. Kernchemie, Univ. Mainz and Dep. o. Physics,   Univ. Jyvaeskylae), A. Woehr (Inst. f. Kernchemie, U...