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Phys. Rev. Lett. 87, 132501 (2001) [4 pages]

Alignment Delays in the N = Z Nuclei 72Kr, 76Sr, and 80Zr

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S. M. Fischer1, C. J. Lister2, D. P. Balamuth3, R. Bauer4, J. A. Becker4, L. A. Bernstein4, M. P. Carpenter2, J. Durell5, N. Fotiades6, S. J. Freeman5, P. E. Garrett4, P. A. Hausladen3, R. V. F. Janssens2, D. Jenkins2,3, M. Leddy5, J. Ressler7, J. Schwartz2, D. Svelnys1, D. G. Sarantites8, D. Seweryniak2, B. J. Varley5, and R. Wyss9
1Department of Physics, DePaul University, Chicago, Illinois 60614
2Physics Division, Argonne National Laboratory, Argonne, Illinois 60439
3Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, Pennsylvania 19104
4Physics Division, Lawrence Livermore National Laboratory, Livermore, California 94550
5Department of Physics, University of Manchester, Manchester M13 9PL, United Kingdom
6Department of Physics and Astronomy, Rutgers University, New Brunswick, New Jersey 08903
7Department of Chemistry, University of Maryland, College Park, Maryland 20742
8Department of Chemistry, Washington University, St. Louis, Missouri 63130
9Royal Institute of Technology, KTH-Frescati, Frescativ 24, 104 05, Stockholm, Sweden

Received 22 March 2001; published 4 September 2001

The ground state rotational bands of the N = Z nuclei 72Kr, 76Sr, and 80Zr have been extended into the angular momentum region where rotation alignment of particles is normally expected. By measuring the moments of inertia of these bands we have observed a consistent increase in the rotational frequency required to start pair breaking, when compared to neighboring nuclei. 72Kr shows the most marked effect. It has been widely suggested that these “delayed alignments” arise from np-pairing correlations. However, alignment frequencies are very sensitive to shape degrees of freedom and normal pairing, so the new experimental observations are still open to interpretation.

© 2001 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.87.132501
DOI:
10.1103/PhysRevLett.87.132501
PACS:
27.50.+e, 21.30.Fe, 23.20.Lv, 24.10.-i
 
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