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; A. Blanc; M. Jentschel; U. Köster; P. Mutti; T. Soldner; G. de France; G.S. Simpson; C.A. Ur

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.

Document type :

Conference papers

Domain :

Physics [physics] / Nuclear Theory [nucl-th]

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Submitted on : Tuesday, July 12, 2016 - 10:28:21 AM
Last modification on : Tuesday, May 22, 2018 - 9:48:11 PM

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

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

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