Mass separated sources of ${}_{}{}^{223}{}_{}{}^{}\mathrm{Ac}$ with ${}_{}{}^{219}{}_{}{}^{}\mathrm{Fr}$ in secular equilibrium were used to study the level structure of ${}_{}{}^{215}{}_{}{}^{}\mathrm{At}$ following alpha decay of ${}_{}{}^{219}{}_{}{}^{}\mathrm{Fr}$. The levels in ${}_{}{}^{215}{}_{}{}^{}\mathrm{At}$ can be interpreted in terms of the π(${\mathit{h}}_{9/2}$${)}^3$ν(${\mathit{g}}_{9/2}$${)}^4$, π(${\mathit{h}}_{9/2}$${)}^2$${\mathit{f}}_{7/2}$ν(${\mathit{g}}_{9/2}$${)}^4$, and π(${\mathit{h}}_{9/2}$${)}^2$${\mathit{i}}_{13/2}$ν(${\mathit{g}}_{9/2}$${)}^4$ shell model configurations. No evidence for reflection asymmetry is found.

• Received 14 December 1992

DOI:https://doi.org/10.1103/PhysRevC.47.1801