Proton and $\alpha$ emission from ${}^{185}\mathrm{Bi}$ have been confirmed and measured with improved statistics. The ${}^{185}\mathrm{Bi}$ nuclei were produced via the ${}^{95}\mathrm{Mo}{(}^{92}\mathrm{Mo},pn)$ reaction at a bombarding energy of 420 MeV. The proton decay energy from the ${1/2}^{+}$ intruder state in ${}^{185}\mathrm{Bi}$ to the ${}^{184}\mathrm{Pb}$ ground state was measured to be 1.598(16) MeV with a proton branching ratio $b_p=0.85\mathrm{}\left(6\right).$ An $\alpha$ decay branch from the same state was measured, $b_{\alpha }=0.15\mathrm{}\left(6\right),$ with an energy of 8.08(3) MeV. The state has a half-life of 50(8) $\mu \mathrm{s}.$ In addition, the $\alpha$ branching ratio of the ground state of ${}^{184}\mathrm{Pb}$ was determined for the first time to be $b_{\alpha }=0.23\mathrm{}\left(14\right).$

• Received 24 October 2000

DOI:https://doi.org/10.1103/PhysRevC.63.044304