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Phys. Rev. Lett. 98, 012501 (2007) [4 pages]

Return of Collective Rotation in 157Er and 158Er at Ultrahigh Spin

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E. S. Paul1, P. J. Twin1, A. O. Evans1, A. Pipidis2, M. A. Riley2, J. Simpson3, D. E. Appelbe3, D. B. Campbell2,*, P. T. W. Choy1, R. M. Clark4, M. Cromaz4, P. Fallon4, A. Görgen4,†, D. T. Joss3,‡, I. Y. Lee4, A. O. Macchiavelli4, P. J. Nolan1, D. Ward4, and I. Ragnarsson5
1Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, United Kingdom
2Department of Physics, Florida State University, Tallahassee, Florida 32306, USA
3CCLRC Daresbury Laboratory, Daresbury, Warrington WA4 4AD, United Kingdom
4Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
5Department of Mathematical Physics, Lund Institute of Technology, P.O. Box 118, S-22100 Lund, Sweden

Received 5 September 2006; published 5 January 2007

A new frontier of discrete-line γ-ray spectroscopy at ultrahigh spin has been opened in the rare-earth nuclei 157,158Er. Four rotational structures, displaying high moments of inertia, have been identified, which extend up to spin ∼65ℏ and bypass the band-terminating states in these nuclei which occur at ∼45ℏ. Cranked Nilsson-Strutinsky calculations suggest that these structures arise from well-deformed triaxial configurations that lie in a valley of favored shell energy which also includes the triaxial strongly deformed bands in 161–167Lu.

© 2007 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.98.012501
DOI:
10.1103/PhysRevLett.98.012501
PACS:
21.10.Re, 23.20.En, 23.20.Lv, 27.70.+q

*Present address: Lawrence Livermore National Laboratory, Livermore, CA 94551, USA.

†Present address: DAPNIA/SPhN CEA Saclay, F-91191 Gif-sur-Yvette, France.

‡Present address: Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, United Kingdom.

 
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