Consequences of neutron-proton pairing correlations for the rotational motion of the N = Z nucleus 72Kr

N. S. Kelsall*, R. Wadsworth, A. N. Wilson, P. Fallon, A. O. Macchiavelli, R. M. Clark, D. G. Sarantites, D. Seweryniak, C. E. Svensson, S. M. Vincent, S. Frauendorf, J. A. Sheikh, G. C. Ball

*Corresponding author for this work

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Abstract

High-spin states in the N = Z nucleus 72Kr were populated using the 40Ca(36Ar,2p2n) reaction at a beam energy of 145 MeV. The yrast band has been observed up to a tentative spin of 20ℏ. Nonyrast rotational structures have also been observed for the first time. The alignment of g9/2 protons and neutrons in the yrast band is observed to be significantly delayed relative to the heavier even-even Kr isotopes. Exact deformed cranked shell model calculations suggest that this could be due to the combined effect of isovector (T = 1) and isoscalar (T = 0) neutron-proton pairing correlations.

Original languageEnglish
Article number024309
Pages (from-to)243091-243097
Number of pages7
JournalPhysical Review C - Nuclear Physics
Volume64
Issue number2
DOIs
Publication statusPublished - Aug 2001

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