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Abstract
Medium-spin excited states of the neutron-rich 87Br and 89Br nuclei were observed and studied for the first time. They were populated in fission of 235U induced by the cold-neutron beam of the PF1B facility of the Institut Laue-Langevin, Grenoble. The measurement of γ radiation following fission has been performed using the EXILL array of Ge detectors. The observed level schemes were compared with results of large valence space shell model calculations. Both medium-spin level schemes consist of band-like structures, which can be understood as bands built on the πf 5/2, πp 3/2 and πg 9/2 configurations. Both nuclei have 5/2− ground state spin-parity contrary to the odd-mass Br isotopes containing fewer neutrons, which have 3/2− ground state spin-parity. On the basis of the properties of the πg 9/2 decoupled bands the deformations of the 87Br and 89Br fit to the systematics of nuclei in the region. 87Br is close to the vibrational limit, while 89Br is more rotational.
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Details
1 Institute for Nuclear Research, Hungarian Academy of Sciences, H-4026 Debrecen, Hungary
2 Faculty of Physics, University of Warsaw, ul. Pasteura 5, PL-02-093 Warsaw, Poland
3 Department of Med. Physics and Biophysics, Medical University - Sofia, 1431, Sofia, Bulgaria
4 ELI-NP, Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering IFIN-HH, 077125 Bucharest-Magurele, Romania
5 Université de Strasbourg, IPHC, Strasbourg, France; CNRS, UMR7178, 67037 Strasbourg, France
6 Institut Laue-Langevin, Grenoble, France
7 GANIL, CEA/DSM CNRS/IN2P3, Bd Henri Becquerel, BP 55027, F-14076 Caen Cedex 5, France
8 LPSC, Université Joseph Fourier Grenoble 1, CNRS/IN2P3, Institut National Polytechnique de Grenoble, F-38026 Grenoble Cedex, France
9 INFN, Legnaro, Italy