Band structure inRb78

A level scheme is proposed for ${}_{}{}^{78}{}_{}{}^{}\mathrm{Rb}$, which was obtained through the ${}_{}{}^{64}{}_{}{}^{}\mathrm{Zn}$(${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$,$\mathrm{np}$) reaction at 44 and 52 MeV, by measuring $\gamma -\gamma$ coincidences and $\gamma$-ray angular distributions. The isotopic identification was made by studying on- and off-beam spectra at selected time intervals, and determining the intensities of the different decay products. The main part of the level scheme comprises a $\Delta I=1\mathrm{}$ band which shows a staggering similar to that previously found in ${}_{}{}^{76}{}_{}{}^{}\mathrm{Br}$ and ${}_{}{}^{77}{}_{}{}^{}\mathrm{Kr}$. In addition the level energies are very close to those in ${}_{}{}^{76}{}_{}{}^{}\mathrm{Br}$. It was not possible to establish in a conclusive manner whether the lowest state of the proposed level scheme corresponds to one or the other of the hitherto known 6 and 17.5 min isomers in ${}_{}{}^{78}{}_{}{}^{}\mathrm{Rb}$, but the first possibility appears to be the more likely one.