The Daresbury recoil separator has been used to measure proton radioactivity from the nuclei ${}_{}{}^{150}{}_{}{}^{}\mathrm{Lu}$, ${}_{}{}^{151}{}_{}{}^{}\mathrm{Lu}$, and ${}_{}{}^{147}{}_{}{}^{}\mathrm{Tm}$, produced using the reactions ${}_{}{}^{58}{}_{}{}^{}\mathrm{Ni}$${+}^{96}$Ru${\to }^{154}$${\mathrm{Hf}}^{\mathrm{*}}$ and ${}_{}{}^{58}{}_{}{}^{}\mathrm{Ni}$${+}^{92}$Mo${\to }^{150}$${\mathrm{Yb}}^{\mathrm{*}}$. The half-life of ${}_{}{}^{150}{}_{}{}^{}\mathrm{Lu}$ has been measured for the first time as 35±10 ms, which identifies the proton decay as an l=5 transition from the ${\mathit{h}}_{11/2}$ proton state. New half-life and energy measurements have been made for the known proton transitions from ${}_{}{}^{147}{}_{}{}^{}\mathrm{Tm}$ and ${}_{}{}^{151}{}_{}{}^{}\mathrm{Lu}$, which have been unambiguously assigned using the direct mass identification of the recoil separator. A new half-life measurement of the proton emitter ${}_{}{}^{109}{}_{}{}^{}\mathrm{I}$ is also reported.

• Received 15 January 1993

DOI:https://doi.org/10.1103/PhysRevC.47.1933