States in doubly odd ${}_{}{}^{216}{}_{}{}^{}\mathrm{Fr}$ have been studied using in-beam α, γ, and ${\mathit{e}}^{\mathrm{-}}$ spectroscopy techniques through the ${}_{}{}^{208}{}_{}{}^{}\mathrm{Pb}$${(}^{11}$B3n) fusion-evaporation reaction. ${}_{}{}^{216}{}_{}{}^{}\mathrm{Fr}$ shows a band structure with interleaved states of alternating parities connected by enhanced B(E1) transitions. It represents the lowest-mass corner of the region (Z≥87,N≥129) in which this phenomenon is observed.

• Received 1 September 1989

DOI:https://doi.org/10.1103/PhysRevC.41.R1895