Band structure in79Yand the question ofT=0pairing

Gamma rays in the $N=Z+1\mathrm{}$ nucleus ${}^{79}\mathrm{Y}$ were identified using the reaction ${}^{28}\mathrm{Si}{(}^{54}\mathrm{Fe},{p2n)}^{79}\mathrm{Y}$ at a 200 MeV beam energy and an experimental setup consisting of an array of Ge detectors and the Recoil Mass Spectrometer at Oak Ridge National Laboratory. With the help of additional γ-γ coincidence data obtained with Gammasphere, these γ rays were found to form a strongly coupled rotational band with rigid-rotor-like behavior. Results of conventional Nilsson-Strutinsky cranked shell model calculations, which predict a deformation of ${\beta }_2\sim 0.4,$ are in excellent agreement with the properties of this band. Similar calculations for the neighboring $N=Z$ and $N=Z+1\mathrm{}$ nuclei are also in good agreement with experimental data. This suggests that the presence of the putative $T=0\mathrm{}$ neutron-proton pairing does not significantly affect such simple observables as the moments of inertia of these bands at low spins.