Consequences of Neutron-Proton Pairing Correlations for the Rational Motion of the N=Z Nucleus 72Kr

Consequences of Neutron-Proton Pairing Correlations for the Rational Motion of the N=Z Nucleus 72Kr

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

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 20 h.
Nonyrast rotational structures have also been observed for the first time.
The alignment of g 9/2 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.

  • Phys. Rev. C 64 (2001) 024309

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