Abstract
Neutron deficient isotopes of polonium and bismuth have been produced in the reactions $^{56}\mathrm{Fe}$ + $^{\mathrm{nat}}\mathrm{Ce}$ and $^{56}\mathrm{Fe}$ + $^{141}\mathrm{Pr}$, separated from the primary beam by our gas-filled on-line mass separator. The half-lives have been determined by measuring the lifetimes of individual nuclei. The new isotope $^{192}\mathrm{Po}$ (${T}_{\frac{1}{2}}=34\ifmmode\pm\else\textpm\fi{}3$ ms, ${E}_{\ensuremath{\alpha}}=7.17$ MeV) and a short-lived isomeric state in $^{191}\mathrm{Bi}$ (${T}_{\frac{1}{2}}=150\ifmmode\pm\else\textpm\fi{}15$ ms, ${E}_{\ensuremath{\alpha}}=6.86$ MeV) have been identified.
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