6533b851fe1ef96bd12a973d

RESEARCH PRODUCT

Decay studies ofAu170,171,Hg171–173, andTl176

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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 $\ensuremath{\alpha}$ 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 $\ensuremath{\alpha}$-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 $\ensuremath{\alpha}$-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.