Alignment delays in the N = Z nuclei 72Kr, 76Sr, and 80Zr

S. M. Fischer, C. J. Lister, D. P. Balamuth, R. Bauer, J. A. Becker, L. A. Bernstein, M. P. Carpenter, J. Durell, N. Fotiades, S. J. Freeman, P. E. Garrett, P. A. Hausladen, R. V.F. Janssens, D. Jenkins, M. Leddy, J. Ressler, J. Schwartz, D. Svelnys, D. G. Sarantites, D. SeweryniakB. J. Varley, R. Wyss

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Abstract

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.

Original languageEnglish
JournalPhysical Review Letters
Volume87
Issue number13
DOIs
StatePublished - 2001
Externally publishedYes

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