Levels in ${\mathrm{Bi}}^{203}$, ${\mathrm{Bi}}^{205}$, and ${\mathrm{Bi}}^{207}$

The decay of the odd-mass isotopes of polonium to levels in ${\mathrm{Bi}}^{203}$, ${\mathrm{Bi}}^{205}$, and ${\mathrm{Bi}}^{207}$ have been studied. Isotopically separated sources have been produced in the Princeton-Pennsylvania accelerator and mass-dispersed by means of the Princeton electromagnetic isotope separator. $\gamma$-ray and conversion-electron spectra have been observed. With the aid of $\gamma -\gamma$ coincidences, level schemes have been constructed for these three bismuth isotopes.