Proton and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>α</mml:mi></mml:math>radioactivity below the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Z</mml:mi><mml:mo>=</mml:mo><mml:mn>82</mml:mn><mml:mn/></mml:math>shell closure

Ground and isomeric proton and alpha decay branches are reported for the new isotope ${}^{177}\mathrm{Tl},$ produced by bombarding a ${}^{102}\mathrm{Pd}$ target with a 370 MeV beam of ${}^{78}\mathrm{Kr}$ ions. The ground state is assigned as a $\ensuremath{\pi}{s}_{1/2}$ configuration and the high spin isomer is assigned as a $(\ensuremath{\pi}{h}_{11/2}{)}^{\ensuremath{-}1}$ configuration. The ground-state proton decay of ${}^{171}\mathrm{Au}$ has been identified for the first time, produced by bombarding a ${}^{96}\mathrm{Ru}$ target with ${}^{78}\mathrm{Kr}$ ions. The ${}^{171}\mathrm{Au}$ ground state is also assigned as a $\ensuremath{\pi}{s}_{1/2}$ configuration. Spectroscopic factors, masses, and proton separation energies are derived using these new proton decay measurements. New ground-state $\ensuremath{\alpha}$ decays for ${}^{169}\mathrm{Ir}$ and ${}^{173}\mathrm{Au}$ are also reported.