Abstract
High-spin states in the $N=Z$ nucleus ${}^{72}\mathrm{Kr}$ were populated using the ${}^{40}\mathrm{Ca}{(}^{36}\mathrm{Ar},2p2n)$ reaction at a beam energy of 145 MeV. The yrast band has been observed up to a tentative spin of 20\ensuremath{\Elzxh}. 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.
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