We report the first study of ${}_{}{}^{212}{}_{}{}^{}\mathrm{Ra}$ by using a variety of in-beam techniques through the ${}_{}{}^{204}{}_{}{}^{}\mathrm{Pb}$${(}^{12}$C,4 roman n) sup 212—Ra reaction. The level scheme of ${}_{}{}^{212}{}_{}{}^{}\mathrm{Ra}$ up to a spin of 16 including 14 levels and 15 transitions has been established. Two isomeric states with half-lives of 10.9 μs and 0.85 μs were found and their g factors were measured by the stroboscopic method. Configurations of the levels up to $I^{\pi }$${=13\mathrm{}}^{\mathrm{-}}$ have been assigned tentatively by the measured g factors, the systematics in the ${}_{}{}^{210}{}_{}{}^{}\mathrm{Rn}$ isotone, and the excitation energies estimated by the weak coupling of two-neutron hole states to the levels in ${}_{}{}^{214}{}_{}{}^{}\mathrm{Ra}$.

• Received 22 October 1985

DOI:https://doi.org/10.1103/PhysRevC.33.392