Lifetimes and $\gamma \gamma$ coincidences for low-spin states of the odd-odd nucleus ${}^{50}\mathrm{Mn}$ were measured in the ${}^{40}\mathrm{Ca}{(}^{12}\mathrm{C}{,np)}^{50}\mathrm{Mn}$ fusion-evaporation reaction at 27 MeV beam energy at the ESTU-tandem accelerator at Yale. The excitation energy of the $J^{\pi }{=5\mathrm{}}^{+}$ isomer is established for the first time from high-resolution $\gamma$-ray spectroscopy. Comparison to simulations of the Doppler-shift attenuation processes as functions of the level lifetimes enables us to extract lifetime information for five states. The measurement of $B\left(M1\mathrm{}\right)\mathrm{}$ values agrees with the previous assignments of quasideuteron configurations in ${}^{50}\mathrm{Mn}$ done on the basis of $E2/M1\mathrm{}$-multipole mixing ratios and $\gamma$-branching ratios. The observations verify the predictions of an earlier full $\mathrm{pf}$-shell model calculation for ${}^{50}\mathrm{Mn}.$

• Received 5 July 2001

DOI:https://doi.org/10.1103/PhysRevC.65.024317