High-spin yrast states in the γ-soft nuclei 135Pr and 134Ce

E. S. Paul, C. Fox, A. J. Boston, H. J. Chantler, C. J. Chiara, R. M. Clark, M. Cromaz, M. Descovich, P. Fallon, D. B. Fossan, A. A. Hecht, T. Koike, I. Y. Lee, A. O. Macchiavelli, P. J. Nolan, K. Starosta, R. Wadsworth, and I. Ragnarsson
Phys. Rev. C 84, 047302 – Published 17 October 2011

Abstract

High-spin states have been studied in 59135Pr, populated through the 116Cd(23Na,4n) reaction at 115 MeV, using the Gammasphere γ-ray spectrometer. The negative-parity yrast band has been significantly extended to spin 45 and excitation energy 21.5 MeV, showing evidence for several rotational alignments. The positive-parity yrast band of 58134Ce, populated through the p4n channel of this reaction, was also populated to spin 38 and excitation energy 18 MeV. Cranking calculations indicate that these nuclei are soft with respect to the triaxiality parameter γ and that several competing nuclear shapes occur at high spin.

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  • Received 15 June 2011

DOI:https://doi.org/10.1103/PhysRevC.84.047302

©2011 American Physical Society

Authors & Affiliations

E. S. Paul1, C. Fox1, A. J. Boston1, H. J. Chantler1, C. J. Chiara2,*, R. M. Clark3, M. Cromaz3, M. Descovich1, P. Fallon3, D. B. Fossan2, A. A. Hecht4,†, T. Koike2,‡, I. Y. Lee3, A. O. Macchiavelli3, P. J. Nolan3, K. Starosta2,§, R. Wadsworth5, and I. Ragnarsson6

  • 1Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, United Kingdom
  • 2Department of Physics and Astronomy, State University of New York at Stony Brook, Stony Brook, New York 11794, USA
  • 3Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
  • 4Wright Nuclear Structure Laboratory, Physics Department, Yale University, New Haven, Connecticut 06520, USA
  • 5Department of Physics, University of York, Heslington, York YO10 5DD, United Kingdom
  • 6Division of Mathematical Physics, LTH, Lund University, P.O. Box 118, S-22100 Lund, Sweden

  • *Present address: Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA.
  • Present address: Department of Chemical and Nuclear Engineering, University of New Mexico, Albuquerque, New Mexico 87131-0001, USA.
  • Present address: Graduate School of Science, Tohoku University, Sendai, 980-8578, Japan.
  • §Present address: Department of Chemistry, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada.

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Vol. 84, Iss. 4 — October 2011

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