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Phys. Rev. C 61, 037303 (2000) [4 pages]

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

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D. E. Appelbe1, C. W. Beausang2, C. J. Barton2,3, M. A. Caprio2, R. F. Casten2, J. Cederkäll2, J. R. Cooper2, R. Krücken2, J. R. Novak2, N. V. Zamfir2,3,4, and Z. Wang2
1Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada L8S 4M1
2Wright Nuclear Structure Laboratory, Yale University, 273 Whitney Avenue, New Haven, Connecticut
3Clark University, Worcester, Massachusetts 01610
4National Institute for Physics and Nuclear Engineering, Bucharest, Romania

Received 4 October 1999; published 16 February 2000

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 ΔEγ=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.

© 2000 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.61.037303
DOI:
10.1103/PhysRevC.61.037303
PACS:
21.10.Re, 23.20.Lv, 27.70.+q
 
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