Alpha Half-Lives of ${\mathrm{Cm}}^{244}$, ${\mathrm{Cm}}^{245}$, and ${\mathrm{Cm}}^{246}$

The alpha half-lives of ${\mathrm{Cm}}^{244}$, ${\mathrm{Cm}}^{245}$, and ${\mathrm{Cm}}^{246}$ measured from mass spectrometric analyses of curium and its plutonium daughters are 18.4±0.5 years (weighted average of present results and those reported in reference 1), 1.15±0.5×${10}^4$ years, and 4.0±0.6×${10}^3$ years, respectively.