Evidence for superdeformation in 149,150dy: Onset of the collapse of the z=66 deformed shell closure?

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An experiment has been performed to search for superdeformed (SD) states in 149,150Dy. While no evidence for discrete superdeformed states has been observed, a superdeformed ridge with a separation of ΔΕγ=52 keV with a total intensity of 1.8±0.5% that of 150Dy has been observed. An upper limit of 0.8% (0.9%), of the intensity of 150Dy (149Dy), is placed for observation of the most intense discrete line states. The relative weakness in the SD population is suggested to be due to a rapid decrease in the depth of the superdeformed minimum, as one moves away from doubly magic 152Dy.


  • D. E. Appelbe
  • C. W. Beausang
  • C. J. Barton
  • M. A. Caprio
  • R. F. Casten
  • J. Cederkäll
  • J. R. Cooper
  • R. Krücken
  • J. R. Novak
  • N. V. Zamfir
  • Z. Wang
External organisations
  • McMaster University
  • Yale University
  • Clark University
  • “Horia Hulubei” National Institute of Physics and Nuclear Engineering
Original languageEnglish
Article number037303
Pages (from-to)373031-373034
Number of pages4
JournalPhysical Review C - Nuclear Physics
Issue number3
Publication statusPublished - 2000 Jan 1
Publication categoryResearch
Externally publishedYes