Ultrahigh-spin spectroscopy of $^{159,160}\mathrm{Er}$: Observation of triaxial strongly deformed structures

Ultrahigh-spin spectroscopy of ${}^{159, 160}{Er}$ : Observation of triaxial strongly deformed structures

J. Ollier, J. Simpson, X. Wang, M. A. Riley, A. Aguilar, C. Teal, E. S. Paul, P. J. Nolan, M. Petri, S. V. Rigby, J. Thomson, C. Unsworth, M. P. Carpenter, R. V. F. Janssens, F. G. Kondev, T. Lauritsen, S. Zhu, D. J. Hartley, I. G. Darby, and I. Ragnarsson

Phys. Rev. C 80, 064322 – Published 29 December 2009

Abstract

Three weakly populated high-spin rotational bands associated with the $γ$ decay of ${}^{159}{Er}$ and ${}^{160}{Er}$ were observed in fusion-evaporation reactions involving a beam of ${}^{48}{Ca}$ at an energy of $215$ MeV incident on a ${}^{116}{Cd}$ target. The $γ$ decays were detected using the highly efficient Gammasphere spectrometer. The discovery of these bands, which extend discrete-line spectroscopy in these nuclei to ultrahigh spin of $~ 60 ℏ$ , is consistent with recent observations of high-spin collective structures in isotopes of Er, Yb, and Tm around $N = 90$ . Cranked Nilsson-Strutinsky calculations suggest that these bands may arise from well-deformed triaxial configurations with either positive or negative $γ$ deformation.

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Received 19 October 2009

DOI:https://doi.org/10.1103/PhysRevC.80.064322

Authors & Affiliations

J. Ollier and J. Simpson

STFC Daresbury Laboratory, Daresbury, Warrington WA4 4AD, United Kingdom

X. Wang, M. A. Riley, A. Aguilar, and C. Teal

Department of Physics, Florida State University, Tallahassee, Florida 32306, USA

E. S. Paul, P. J. Nolan, M. Petri^*, S. V. Rigby, J. Thomson, and C. Unsworth

Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, United Kingdom

M. P. Carpenter, R. V. F. Janssens, F. G. Kondev, T. Lauritsen, and S. Zhu

Nuclear Engineering Division and Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA

D. J. Hartley

Department of Physics, U. S. Naval Academy, Annapolis, Maryland 21402, USA

I. G. Darby^†

Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA

I. Ragnarsson

Division of Mathematical Physics, LTH, Lund University, Post Office Box 118, S-22100 Lund, Sweden

^*Present address: Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
^†Present address: Instituut voor Kern- en Stralingsfysica, Katholieke Universiteit Leuven, B-3001 Leuven, Belgium.

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Vol. 80, Iss. 6 — December 2009

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Physical Review C

covering nuclear physics

Ultrahigh-spin spectroscopy of ${}^{159, 160}{Er}$ : Observation of triaxial strongly deformed structures

J. Ollier, J. Simpson, X. Wang, M. A. Riley, A. Aguilar, C. Teal, E. S. Paul, P. J. Nolan, M. Petri, S. V. Rigby, J. Thomson, C. Unsworth, M. P. Carpenter, R. V. F. Janssens, F. G. Kondev, T. Lauritsen, S. Zhu, D. J. Hartley, I. G. Darby, and I. Ragnarsson

Phys. Rev. C 80, 064322 – Published 29 December 2009

Abstract

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Physical Review C

covering nuclear physics

Ultrahigh-spin spectroscopy of Er159,160: Observation of triaxial strongly deformed structures

J. Ollier, J. Simpson, X. Wang, M. A. Riley, A. Aguilar, C. Teal, E. S. Paul, P. J. Nolan, M. Petri, S. V. Rigby, J. Thomson, C. Unsworth, M. P. Carpenter, R. V. F. Janssens, F. G. Kondev, T. Lauritsen, S. Zhu, D. J. Hartley, I. G. Darby, and I. Ragnarsson

Phys. Rev. C 80, 064322 – Published 29 December 2009

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Ultrahigh-spin spectroscopy of ${}^{159, 160}{Er}$ : Observation of triaxial strongly deformed structures