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Five isotopes of mendelevium, with mass numbers 248 through 252, were studied by means of $\ensuremath{\alpha}$-particle spectroscopy. The isotopes were produced by bombarding $^{241}\mathrm{Am}$ and $^{243}\mathrm{Am}$ targets with $^{12}\mathrm{C}$ and $^{13}\mathrm{C}$ ions accelerated by the Berkeley heavy-ion linear accelerator. The half-lives of the nuclides and the energies of the main $\ensuremath{\alpha}$-particle groups, respectively, were observed to be: $^{248}\mathrm{Md}$: 7 \ifmmode\pm\else\textpm\fi{} 3 sec, 8.32 \ifmmode\pm\else\textpm\fi{} 0.02 MeV; $^{249}\mathrm{Md}$: 24 \ifmmode\pm\else\textpm\fi{} 4 sec, 8.03 \ifmmode\pm\else\textpm\fi{} 0.02 MeV; $^{250}\mathrm{Md}$: 52 \ifmmode\pm\else\textpm\fi{} 6 sec, 7.75 \ifmmode\pm\else\textpm\fi{} 0.02 MeV; $^{251}\mathrm{Md}$: 4.0 \ifmmode\pm\else\textpm\fi{} 0.5 min, 7.55 \ifmmode\pm\else\textpm\fi{} 0.02 MeV; $^{252}\mathrm{Md}$: 2.3 \ifmmode\pm\else\textpm\fi{} 0.8 min, no $\ensuremath{\alpha}$ decay. The $\ensuremath{\alpha}$-particle energies of $^{245}\mathrm{Es}$, $^{246}\mathrm{Es}$, and $^{247}\mathrm{Es}$, produced mainly by ($\mathrm{HI},\ensuremath{\alpha}\mathrm{xn}$) reactions, were measured to be 7.73 \ifmmode\pm\else\textpm\fi{} 0.02, 7.36 \ifmmode\pm\else\textpm\fi{} 0.03, and 7.31 \ifmmode\pm\else\textpm\fi{} 0.03 MeV, respectively, and the half-life of $^{247}\mathrm{Es}$ was found to be 4.7\ifmmode\pm\else\textpm\fi{}0.3 min. Excitation curves for producing the Md isotopes and some other activities are presented. Estimates for the electron-capture branching of the Md isotopes are given. $\ensuremath{\alpha}$-decay hindrance factors were calculated using the spin-independent equations of Preston. The $\ensuremath{\alpha}$-decay energy systematics of the mendelevium isotopes is discussed.

Studies of Mendelevium Isotopes with Mass Numbers 248 Through 252