Energy Levels of Polonium-210

The energy levels of ${\mathrm{Po}}^{210}$ have been studied as populated by the electron-capture decay of ${\mathrm{At}}^{210}$. An experimental level scheme has been constructed by using data obtained from conversion electron and gamma-ray measurements made with beta-ray and scintillation spectrometers and coincidence counting techniques. A theory of the energy levels of ${\mathrm{Po}}^{210}$ has been developed using the method of Pryce to predict the levels of a nucleus containing two odd protons beyond the double-closed shell from the experimentally known levels of ${\mathrm{Bi}}^{209}$, the nucleus containing a single odd proton beyond the closed shell. Certain features of the theoretically predicted level scheme and the experimental level scheme show reasonable agreement. The spin assignment for ${\mathrm{At}}^{210}$ has been discussed with respect to the $log\mathrm{ft}$ values for its electron capture decay.