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Phys. Rev. C 54, R454 - R458 (1996)

Superdeformation below N=73

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A. Galindo-Uribarri1, S. M. Mullins2 *, D. Ward1, M. Cromaz3, J. DeGraaf3, T. E. Drake3, S. Flibotte2 †, V. P. Janzen1, D. C. Radford1, and I. Ragnarsson4
1AECL, Chalk River Laboratories, Chalk River, Ontario, Canada K0J 1J0
2Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada L8S 4M1
3Department of Physics, University of Toronto, Toronto, Ontario, Canada M5S 1A7
4Department of Mathematical Physics, Lund Institute of Technology, P.O.Box 118, S-221 00 Lund, Sweden

Rapid Communication Received 26 March 1996

A decoupled rotational band with an average dynamical moment of inertia I(2)∼55 ħ2/MeV has been observed to high spin in N=71 129Ce. The measured quadrupole moment of Q0=6.3(4) eb is as large as that of the superdeformed band in 131Ce. The large deformation and decoupled character of the band suggests that the odd neutron occupies either the h9 / 2 / f7 / 2[541]1 / 2- orbital or the i13 / 2[660]1 / 2+ intruder orbital. This is the first example of a superdeformed band extending to high spin below N=73, a neutron number that has long been considered as the boundary for superdeformation in the A∼130 mass region.


©1996 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevC.54.R454
DOI: 10.1103/PhysRevC.54.R454
PACS: 27.60.+j, 23.20.Lv, 21.10.Re, 21.60.Ev

* Present address: Department of Nuclear Physics, RSPhysSE, The Australian National University, Canberra, ACT 0200, Australia.
† Also AECL, Chalk River Laboratories, Chalk River, ON Canada KJO 1J0.

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