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Phys. Rev. C 70, 034315 (2004) [15 pages]

Evidence for noncollective oblate structures at high spin in 123Cs

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A. K. Singh*, H. Hübel, and J. Domscheit
Helmholtz-Institut für Strahlen-und Kernphysik, Universität Bonn, Nussallee 14-16, D-53115 Bonn, Germany

G. B. Hagemann, B. Herskind, D. R. Jensen, and J. N. Wilson†
Niels Bohr Institute, Blegdamsvej 17, KD-2100 Copenhagen Ø, Denmark

R. Clark, M. Cromaz, P. Fallon, A. Görgen‡, I. Y. Lee, A. O. Macchiavelli, and D. Ward
Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA

H. Amro§ and W. C. Ma
Department of Physics, Mississippi State University, Mississippi State, Mississippi 39762, USA

J. Timár
Institute of Nuclear Research of the Hungarian Academy of Sciences, H-4001 Debrecen, Hungary

I. Ragnarsson
Department of Mathematical Physics, Lund Institute of Technology, Box 118, S-221-Lund, Sweden

Received 26 May 2004; published 28 September 2004

High-spin states in 123Cs were populated in the 64Ni(64Ni,p4n) reaction at a beam energy of 265 MeV. Gamma-ray coincidences were measured using the Gammasphere spectrometer. Two additional bands have been placed in the level scheme and the four previously known bands have been extended to higher spin. At the highest spins, two of the bands show irregular level sequences. These structures of noncollective excitations, which compete with collective rotation, are interpreted as band-terminating states. The results are compared to cranked Nilsson-Strutinsky calculations, and configuration assignments to the bands and to the terminating states are discussed.

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.70.034315
DOI:
10.1103/PhysRevC.70.034315
PACS:
23.20.Lv, 23.20.En, 27.60.+j, 21.60.Ev

*Present address: Department of Physics, IIT Kharagpur, Kharagpur-721302, India.

†Present address: LPSC∕IN2P3, F-38026, Grenoble Cedex, France.

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

§Present address: WNSL, Yale University, New Haven, CT 06520-8124.

 
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