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APS » Journals » Phys. Rev. Lett. » Volume 82 » Issue 26
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Phys. Rev. Lett. 82, 5217–5220 (1999)

Superdeformation in 68Zn: Evidence for a New, Neutron-Rich Island of Superdeformation in A∼70 Nuclei

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M. Devlin1, A. V. Afanasjev2,3,4, R. M. Clark5, D. R. LaFosse1,*, I. Y. Lee5, F. Lerma1, A. O. Macchiavelli5, R. W. MacLeod5, I. Ragnarsson2, P. Ring3, D. Rudolph6,†, D. G. Sarantites1, and P. G. Thirolf6
1Chemistry Department, Washington University, St. Louis, Missouri 63130
2Department of Mathematical Physics, Lund Institute of Technology, Box 118, S-22100 Lund, Sweden
3Physik-Department, Technische Universität München, D-85747 Garching, Germany
4Nuclear Research Center, Latvian Academy of Sciences, LV-2169, Salaspils, Latvia
5Nuclear Science Division, E. O. Lawrence Berkeley National Laboratory, Berkeley, California 94720
6Sektion Physik, Ludwig-Maximilians-Universität München, D-85748 Garching, Germany

Received 19 January 1999; published in the issue dated 28 June 1999

A superdeformed rotational structure is reported in the stable nucleus 68Zn. It has a transition quadrupole moment ( Qt) of 2.5-0.4+0.7 e b ( β2≈0.4), as measured by the residual Doppler shift method. Theoretical calculations suggest that two different configurations are possible candidates for this band. One is built without h11/2 neutrons, as seen in superdeformed bands in the A∼60 region, while the other involves one h11/2 neutron in analogy with superdeformed bands in the A∼80 region. The second of these candidate configurations is preferred, thus establishing a new, neutron-rich (relative to the line of β stability) region of superdeformation with Z∼30 and N∼38.

© 1999 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.82.5217
DOI:
10.1103/PhysRevLett.82.5217
PACS:
21.10.Re, 21.10.Ky, 23.20.Lv, 27.50.+e

*Current address: Department of Physics and Astronomy, SUNY at Stony Brook, Stony Brook, NY 11794.

†Current address: Division of Cosmic and Subatomic Physics, Lund University, S-22100 Lund, Sweden.

 
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