High-spin states in N=50Br85 and Rb87 nuclei

N. Fotiades, J. A. Cizewski, R. Krücken, R. M. Clark, P. Fallon, I. Y. Lee, A. O. MacChiavelli, D. P. McNabb, J. A. Becker, L. A. Bernstein, W. Younes

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The level structures of the N=50 Br85 and Rb87 isotopes have been studied in the fission of the compound system formed in three different heavy-ion-induced reactions. In Rb87 many states above the previously known 9/2+ isomer have been established. The coupling of the odd proton occupying the g9/2 orbital to the yrast states in the Kr86 core can account for the first excited states above the isomer in Rb87. A comparison with the first excited states above the 9/2+ state in Kr85 and Y89 reveals similarities in the coupling. At higher excitations similar behavior to Y89 is observed, indicating a possible presence of neutron-core excitations. In Br85 several states up to ~5 MeV excitation energy have been established. Two states at ~2 MeV excitation energy are candidates for the 9/2+ state originating from the odd proton occupying the g9/2 orbital. The experimental results for both isotopes are compared with predictions of the shell model.

Original languageEnglish (US)
Article number064312
JournalPhysical Review C - Nuclear Physics
Issue number6
StatePublished - Jun 2005

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics


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