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arxiv: nucl-ex/0011004 · v2 · submitted 2000-11-03 · ⚛️ nucl-ex

First decay study of the very neutron-rich isotope Br-93

G. Lhersonneau (Inst. f. Kernchemie , Univ. Mainz , Dep. o. Physics , Univ. Jyvaeskylae) , A. Woehr (Inst. f. Kernchemie , Clarendon Lab. , Univ. Oxford) , B. Pfeiffer
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K.-L. Kratz (Inst. f. Kernchemie Univ. Mainz) the ISOLDE Collaboration (CERN)
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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.

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