Phys. Rev. C 72, 064307 (2005) [11 pages]Structural behavior of 157,158,159Dy in the I=30-50ℏ spin regimeReceived 14 February 2005; published 13 December 2005 Significant extensions to the high-spin excitation spectrum of the N=91, 92, 93 isotopes 157,158,159Dy have been achieved using the high-efficiency γ-ray spectrometers Euroball and Gammasphere. These nuclei were populated via weak 3n or αxn exit channels in fusion evaporation reactions. In 157Dy, the yrast band has been extended to Iπ=101/2+ (tentatively to 105/2+) with four sideband structures (two of which are new) observed in the 35–50ℏ spin range. In 158Dy, three bands have been extended to 42+(44+),40-, and 41-(43-), whereas in 159Dy the yrast band is observed to 81/2+(85/2+). The high-spin behavior and band crossing systematics of the Dy isotopes and of the neighboring N = 91, 92, and 93 isotones are discussed in terms of rotational alignments and shape transitions. Cranked Nilsson-Strutinsky calculations without pairing have been performed for detailed comparisons with the very high-spin states observed in 157Dy. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevC.72.064307
DOI:
10.1103/PhysRevC.72.064307
PACS:
27.70.+q, 21.10.Re, 23.20.Lv
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