The ${}^{170,171}\mathrm{Au}$ isotopes were produced in the fusion-evaporation reaction of a ${}^{78}\mathrm{Kr}$ ion beam with a ${}^{96}\mathrm{Ru}$ target. For ${}^{170}\mathrm{Au}$ the proton and $\alpha$ emission from the ground state were observed for the first time and the decay of the isomeric state was measured with improved accuracy. In addition, the decay of ${}^{171}\mathrm{Au}$ was measured with high statistics. A new $\alpha$-emitting nucleus ${}^{171}\mathrm{Hg}$ and the previously known ${}^{172}\mathrm{Hg}$ and ${}^{167,168,169,170}\mathrm{Pt}$ isotopes were also studied. The ground-state proton emission was identified for a new proton emitter ${}^{176}\mathrm{Tl}$ using the fusion-evaporation reaction of ${}^{78}\mathrm{Kr}$ ions with a ${}^{102}\mathrm{Pd}$ target. The previously known proton emitter ${}^{177}\mathrm{Tl}$ and $\alpha$-decaying nucleus ${}^{173}\mathrm{Hg}$ were also identified in this reaction. The fusion products were separated in-flight using a gas-filled recoil separator and implanted into a position-sensitive silicon detector. Identification of the nuclei was based on position, time, and energy correlations between the implants and subsequent decays.

• Received 9 December 2003

DOI:https://doi.org/10.1103/PhysRevC.69.054323