High-spin states in neutron-deficient nuclei nearA=80

In-beam $\gamma$-ray spectroscopy with the reactions ${}_{}{}^{54}{}_{}{}^{}\mathrm{Fe}$ + ${}_{}{}^{28}{}_{}{}^{}\mathrm{Si}$ and ${}_{}{}^{56}{}_{}{}^{}\mathrm{Fe}$ + ${}_{}{}^{28}{}_{}{}^{}\mathrm{Si}$ at beam energies from 80 to 99 MeV were used to study high-spin states in neutron-deficient nuclei in the mass $A\sim 80$ region. Measurements of $\gamma$-ray energies, intensities, angular distributions, excitation functions, and $\gamma -\gamma$ coincidences were used to assign new levels in ${}_{}{}^{79}{}_{}{}^{}\mathrm{Rb}$ and ${}_{}{}^{80}{}_{}{}^{}\mathrm{Sr}$. For the first time, high-spin states in ${}_{}{}^{81}{}_{}{}^{}\mathrm{Sr}$ have been observed.