Evidence for triaxial deformation near N=86: Collective bands in 152,153Dy and 153Ho

D. E. Appelbe, P. J. Twin, C. W. Beausang, D. M. Cullen, D. Curien, G. Duchêne, S. Ertürk, Ch. Finck, B. Haas, E. S. Paul, D. C. Radford, C. Rigollet, M. B. Smith, O. Stezowski, J. C. Waddington, and A. N. Wilson
Phys. Rev. C 66, 044305 – Published 18 October 2002
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Abstract

The N=86,87 isotopes of dysprosium and holmium have been investigated using the Eurogam II γ-ray spectrometer. A new collective rotational band has been observed in 153Ho and the previously observed νi13/2 band in 153Dy has been extended to much higher spin. Comparing these bands and similar bands in 152Dy with the collective bands in the N=90 isotopes of Dy, Ho, and Er suggests that the first h11/2 proton crossing is not observed at N=86,87. This observation has led to the reinterpretation of four of the previously observed bands in 152Dy. It is proposed that the low deformation collective bands in 152,153Dy and 153Ho are associated with a triaxial shape with large positive gamma and that they have a similar origin to the recently observed triaxial superdeformed bands in 163165Lu.

  • Received 22 November 2000

DOI:https://doi.org/10.1103/PhysRevC.66.044305

©2002 American Physical Society

Authors & Affiliations

D. E. Appelbe1,2,3, P. J. Twin3, C. W. Beausang3,*, D. M. Cullen3,†, D. Curien4, G. Duchêne4, S. Ertürk3,‡, Ch. Finck4,§, B. Haas4, E. S. Paul3, D. C. Radford5, C. Rigollet4, M. B. Smith3,∥, O. Stezowski4,¶, J. C. Waddington2, and A. N. Wilson6,**

  • 1CLRC Daresbury Laboratory, Daresbury, Warrington WA4 4AD, United Kingdom
  • 2Department Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada L8S 4M1
  • 3Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, United Kingdom
  • 4Institut de Recherches Subatomiques, F-67037 Strasbourg Cedex, France
  • 5Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
  • 6C.S.N.S.M., IN2P3-C.N.R.S., F-91405 Orsay Campus, France

  • *Present address: W.N.S.L., Physics Department, Yale University, 272 Whitney Avenue, New Haven, CT 06511.
  • Present address: Department of Physics and Astronomy, University of Manchester, Manchester M13 9PL, United Kingdom.
  • Present address: Nigde Universitesi, Fen-Edebiyat Fakültesi, Fizik Bölümü, Nigde, Turkey.
  • §Present address: G.S.I, Plankstrasse 1, 64291 Darmstadt, Germany.
  • Present address: Department of Physics and Astronomy, Rutgers University, New Brunswick, NJ 08903.
  • Present address: Institute de Physique Nucleaire, 43 Boulevard du 11 Novembre 1918, 69622 Villeurbanne Cedex, France.
  • **Present address: Department of Physics, University of York, Heslington, York YO10 5DD, United Kingdom.

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Vol. 66, Iss. 4 — October 2002

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