High spin states inRb78

High spin states have been studied in ${}_{}{}^{78}{}_{}{}^{}\mathrm{Rb}$ using the ${}_{}{}^{54}{}_{}{}^{}\mathrm{Fe}$(${}_{}{}^{28}{}_{}{}^{}\mathrm{Si}$,3pn)${}_{}{}^{78}{}_{}{}^{}\mathrm{Rb}$ and ${}_{}{}^{56}{}_{}{}^{}\mathrm{Fe}({}_{}{}^{28}{}_{}{}^{}\mathrm{Si},\alpha \mathrm{pn}){}_{}{}^{78}{}_{}{}^{}\mathrm{Rb}$ reactions at laboratory energies of 103.5 and 108 MeV. $\gamma -\gamma$ coincidence and $\gamma$-ray angular distribution measurements were performed. New states were found at 1511[${10}^{\mathrm{}(-)\mathrm{}}$], 1908[${11}^{\mathrm{}(-)\mathrm{}}$], 2929[${13}^{\mathrm{}(-)\mathrm{}}$], 4143[(${15}^{-}$)], and 1004[$8^{\mathrm{}(-)\mathrm{}}$] keV above the bandhead state. The latter state is probably the $4^{\mathrm{}(-)\mathrm{}}$, 5.74 min isomeric state whose excitation energy lies somewhat above 103 keV. The states populated in this reaction group into two decay sequences which appear to be rotational bands. The moment-of-inertia parameter $\frac{{\hslash }^2}{2\mathcal{I}}$ is about 20 keV. There is a close similarity to the level structure of ${}_{}{}^{76}{}_{}{}^{}\mathrm{Br}$.