Identification of excited states in [Formula Presented] Systematics of the [Formula Presented] 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, I. Y. Lee, A. O. Macchiavelli

*Corresponding author for this work

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Abstract

Excited states have been identified in the very neutron-deficient [Formula Presented] nucleus. High-spin spectroscopy has been performed using the Gammasphere array, and the assignment of gamma-ray transitions to [Formula Presented] 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 [Formula Presented] band of [Formula Presented] Two additional bands have been observed and are tentatively assigned to be based on protons in the [Formula Presented] and [Formula Presented] orbitals. Alignments of pairs of [Formula Presented] 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 [Formula Presented] alignment in the [Formula Presented] band and of the [Formula Presented] alignment in the [Formula Presented] band. The frequencies of these alignments can be qualitatively explained only if a neutron-proton interaction is taken into account.

Original languageEnglish
Number of pages1
JournalPhysical Review C - Nuclear Physics
Volume63
Issue number2
DOIs
Publication statusPublished - 1 Jan 2001

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