Medium-spin states of the neutron-rich 87,89Br isotopes: Configurations and shapes

B. Nyakó, J. Tímár, M. Csatlós, Zs. S. Dombrádi, A. Krasznahorkay, I. Kuti, D. Sohler, T. G. Tornyi, M. Czerwiński, T. Rząca-Urban, W. Urban, P. Bączyk, L. Atanasova, D. L. Balabanski, K. Sieja, A. Blanc, M. Jentschel, U. Köster, P. Mutti, T. SoldnerG. De France, G. S. Simpson, C. A. Ur

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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, whihich 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.

Original languageEnglish
Article number012051
JournalJournal of Physics: Conference Series
Volume724
Issue number1
DOIs
Publication statusPublished - júl. 14 2016

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Nyakó, B., Tímár, J., Csatlós, M., Dombrádi, Z. S., Krasznahorkay, A., Kuti, I., Sohler, D., Tornyi, T. G., Czerwiński, M., Rząca-Urban, T., Urban, W., Bączyk, P., Atanasova, L., Balabanski, D. L., Sieja, K., Blanc, A., Jentschel, M., Köster, U., Mutti, P., ... Ur, C. A. (2016). Medium-spin states of the neutron-rich 87,89Br isotopes: Configurations and shapes. Journal of Physics: Conference Series, 724(1), [012051]. https://doi.org/10.1088/1742-6596/724/1/012051