Medium-spin states of the neutron-rich $^{87,89}$Br isotopes: configurations and shapes

B.M. Nyako J. Timar M. Csatlos Zs. Dombradi A. Krasznahorkay I. Kuti D. Sohler T.G. Tornyi M. Czerwinski T. Rzaca-Urban W. Urban P. Baczyk L. Atanasova D.L. Balabanski K. Sieja 1 A. Blanc 2 M. Jentschel 2 U. Köster 2 P. Mutti 2 T. Soldner 2 G. de France 3 G.S. Simpson 4 C.A. Ur
1 IPHC - Institut Pluridisciplinaire Hubert Curien
2 ILL - Institut Laue-Langevin
3 GANIL - Grand Accélérateur National d'Ions Lourds
4 LPSC - Laboratoire de Physique Subatomique et de Cosmologie
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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Submitted on : Tuesday, July 12, 2016 - 10:28:21 AM
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B.M. Nyako, J. Timar, M. Csatlos, Zs. Dombradi, A. Krasznahorkay, et al.. Medium-spin states of the neutron-rich $^{87,89}$Br isotopes: configurations and shapes. XXI International School on Nuclear Physics and Applications & International Symposium on Exotic Nuclei, Sep 2015, Varna, Bulgaria. pp.012051, ⟨10.1088/1742-6596/724/1/012051⟩. ⟨in2p3-01344537⟩

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