High-spin states in ${}^{123}\mathrm{Te}$ were populated in the ${}^{82}\mathrm{Se}({}^{48}\mathrm{Ca},\alpha 3n){}^{123}\mathrm{Te}$ reaction at a beam energy of 205 MeV, and $\gamma$-ray coincidence events were measured with the Gammasphere array. The level scheme has been extended to spin $I\approx 50$ through the identification of several new $\gamma$-ray transitions, and a rotational band feeding states above $I\approx 20$. Cranked Nilsson-Strutinsky calculations are consistent with the observed low-spin yrast structure and support an interpretation of the high-spin band as a smooth terminating configuration involving two $g_{9/2}$ proton holes and no neutron excitations across the $N=82$ shell gap. A transition from near-prolate to triaxial rotation about the intermediate axis is suggested for the band near $I\approx 40$.

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• Collective levels
• Electromagnetic transitions
• High spin states
• Nuclear spin & parity
• Nuclear structure & decays
• 90 ≤ A ≤ 149
• Spin
• Collective models
• Spectrometers & spectroscopic techniques