Properties of theBi209Ground-State Analog inPo209

The analog of the ground state of ${}_{}{}^{209}{}_{}{}^{}\mathrm{Bi}$ was investigated by both the ${}_{}{}^{209}{}_{}{}^{}\mathrm{Bi}\mathrm{}(p,n)\mathrm{}{}_{}{}^{209}{}_{}{}^{}\mathrm{Po}$ and the ${}_{}{}^{209}{}_{}{}^{}\mathrm{Bi}(p,n\overline{p}){}_{}{}^{208}{}_{}{}^{}\mathrm{Bi}$ reactions. The Coulomb energy difference ${}_{}{}^{209}{}_{}{}^{}\mathrm{Po}$-${}_{}{}^{209}{}_{}{}^{}\mathrm{Bi}$ was determined as 18.92 ± 0.03 MeV, and the relative partial widths for proton decay into the $p_{\frac{1}{2}}$, $f_{\frac{5}{2}}$, and $p_{\frac{3}{2}}$ channels were determined. The total width of the analog state was found to be 380 ± 80 keV.