Alpha-Emitting Isomer: Polonium-211

摘要: The half-life of AcC\ensuremath{'} (${\mathrm{Po}}^{211}$) has been measured for the first time, and is 0.52 second rather than $\frac{1}{200}$ seconds widely quoted in literature. Three short-lived alpha emitters resulting from alpha-particle bombardment lead have studied. They identified as ${\mathrm{Bi}}^{211}$ (${T}_{\frac{1}{2}}=2.16$ min) two states ${\mathrm{Po}}^{211}$ (${T}_{\frac{1}{2}}=25 sec\mathrm{and}0.52\phantom{\rule{0ex}{0ex}}sec$) by means chemical separations, excitation functions, measurements, measurements energies emitted particles. energy show that 0.52-second state an excited ${\mathrm{Po}}^{211}$, with about 0.3 Mev. A group particles having 9-Mev was observed but not identified.