States in doubly odd ${}^{218}\mathrm{Fr}$ have been studied using in-beam spectroscopy $\alpha -\gamma -\gamma$ coincidence techniques mainly through the ${}^{209}\mathrm{Bi}{(}^{18}\mathrm{O},$ $2\alpha n)$ reaction at 94 MeV bombarding energy, using the $8\pi$ GASP-ISIS spectrometer at Legnaro. ${}^{218}\mathrm{Fr}$ shows a band structure, with interleaved states of alternating parities connected by enhanced $E1\mathrm{}$ transitions. Tentative spin assignment and the relation between the structure of ${}^{218}\mathrm{Fr}$ and its isotone ${}^{220}\mathrm{Ac}$ is discussed.

• Received 22 February 2000

DOI:https://doi.org/10.1103/PhysRevC.62.024304