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Phys. Rev. C 72, 064325 (2005) [16 pages]

Detailed high-spin spectroscopy and the search for the wobbling mode in 171Ta

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D. J. Hartley, W. H. Mohr, and J. R. Vanhoy
Department of Physics, U.S. Naval Academy, Annapolis, Maryland 21402, USA

M. A. Riley, A. Aguilar, and C. Teal
Department of Physics, Florida State University, Tallahassee, Florida 32306, USA

R. V. F. Janssens, M. P. Carpenter, A. A. Hecht*, T. Lauritsen, E. F. Moore, and S. Zhu
Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA

F. G. Kondev
Nuclear Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439, USA

M. K. Djongolov, M. Danchev, and L. L. Riedinger
Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA

G. B. Hagemann and G. Sletten
The Niels Bohr Institute, Blegdamsvej 17, DK-2100 Copenhagen, Denmark

P. Chowdhury and S. K. Tandel
Department of Physics, University of Massachusetts, Lowell, Massachusetts 01854, USA

W. C. Ma
Department of Physics, Mississippi State University, Mississippi State, Mississippi 39762, USA

S. W. Ødegärd
Department of Physics, University of Oslo, PB 1048 Blindern, N-0316 Oslo, Norway

Received 26 September 2005; published 29 December 2005

High-spin states in 171Ta were populated in the 124Sn(51V,4n) reaction at 228 MeV to search for evidence of stable triaxial deformation. Identification of a wobbling sequence based on the previously known πi13/2 structure would provide a unique signature for this rarely observed shape. No such sequence was identified in these data, which suggests that the island of triaxial strongly deformed bands may be smaller than once thought. However, over 200 new transitions and two new bands were placed in the level scheme and the sequence based on the πi13/2 orbital could be observed up to spin and parity Iπ=(101/2+). The relative excitations of all the sequences were determined and the ground state of 171Ta was found to have 5/2+ quantum numbers, contrary to previous reports. All of the previously known structures were extended to much higher spin and their high-frequency band crossings are interpreted within the framework of the cranked shell model.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.72.064325
DOI:
10.1103/PhysRevC.72.064325
PACS:
21.10.Re, 23.20.Lv, 25.70.Gh, 27.70.+q

*Also at Department of Chemistry, University of Maryland, College Park, MD 20742.

 
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