Identification of excited states in 117Cs: Systematics of the ν(h11/2)2 alignment

J. F. Smith*, V. Medina-Chico, C. J. Chiara, D. B. Fossan, G. J. Lane, J. M. Sears, I. Thorslund, H. Amro, C. N. Davids, R. V.F. Janssens, D. Seweryniak, I. M. Hibbert, R. Wadsworth, Lee I Y, A. O. Macchiavelli

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Excited states have been identified in the very neutron-deficient 11755Cs62 nucleus. High-spin spectroscopy has been performed using the Gammasphere array, and the assignment of gamma-ray transitions to 117Cs has been made in a separate experiment in which gamma rays were detected in coincidence with x rays and with recoiling evaporation residues. A previously observed sequence of five gamma rays has been extended by 11 transitions, to high spin, and has been identified as the yrast π(h11/2)[550]1/2- band of 117Cs. Two additional bands have been observed and are tentatively assigned to be based on protons in the [404]9/2+ and [422]3/2+ orbitals. Alignments of pairs of h11/2 neutrons and protons are observed in all of the bands. The alignments are compared to cranked Woods-Saxon calculations, and are discussed with respect to the effects of a neutron-proton interaction. Of particular interest are the features of the ν(h11/2)2 alignment in the π[550]1/2- band and of the π(h11/2)2 alignment in the [422]3/2+ band. The frequencies of these alignments can be qualitatively explained only if a neutron-proton interaction is taken into account.

Original languageEnglish
Article number024319
Pages (from-to)243191-2431911
Number of pages2188721
JournalPhysical Review C - Nuclear Physics
Issue number2
Publication statusPublished - Feb 2001

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