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Phys. Rev. C 73, 061303(R) (2006) [5 pages]

First observation of excited states in 114Cs: Spectroscopy of the yrast ν(h11/2)⊗π(h11/2) band

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J. F. Smith1,*, A. M. Fletcher1, C. J. Chiara2,3, M. P. Carpenter4, H. J. Chantler5, C. N. Davids4, J. L. Durell1, D. B. Fossan2, S. J. Freeman1, R. V. F. Janssens4, T. Koike2, F. G. Kondev4, D. R. LaFosse2, J. C. Lisle1, D. Patel1, E. S. Paul5, W. Reviol3, D. G. Sarantites3, D. Seweryniak4, K. Starosta2,†, R. Wadsworth6, and A. N. Wilson6,‡
1Schuster Laboratory, University of Manchester, Manchester M13 9PL, United Kingdom
2Department of Physics and Astronomy, State University of New York at Stony Brook, Stony Brook, New York 11794-3800, USA
3Department of Chemistry, Washington University, St. Louis, Missouri 63130, USA
4Argonne National Laboratory, Argonne, Illinois 60439, USA
5Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, United Kingdom
6Department of Physics, University of York, Heslington, York YO10 5DD, United Kingdom

Received 20 January 2006; published 8 June 2006

Excited states have been observed for the first time in the very neutron-deficient 55114Cs59 nucleus. The assignment to 114Cs was made by detecting γ rays in coincidence with evaporated charged particles and with recoiling evaporation residues. A rotational band has been observed up to spin 21ℏ (tentatively 25ℏ). Excitation-energy systematics and a study of quasiparticle alignments suggest that the band is based on the ν(h11/2)⊗π(h11/2) configuration. Unlike bands based on this configuration in heavier cesium isotopes, only one signature partner is observed, and there is no evidence for signature inversion. These observations agree with theoretical calculations which predict that Coriolis-induced signature splitting should dominate at N=59.

© 2006 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.73.061303
DOI:
10.1103/PhysRevC.73.061303
PACS:
21.10.Re, 23.20.Lv, 27.60.+j, 29.30.Kv

*Corresponding address: John. F. Smith@Manchester.ac.uk

†Present address: NSCL, Michigan State University, East Lansing, Michigan 48824, USA.

‡Present address: Department of Nuclear Physics, RSPhysSE, Australian National University, Canberra ACT 0200, Australia.

 
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