Linewidths of the 46.5- and 99.1-keV Levels ofW183

Using ${\mathrm{Re}}^{183}$ sources in cubic matrices of tungsten metal and tantalum metal, lower limits to the half-lives of the ${\frac{3}{2}}^{-}$ 46.5-keV and ${\frac{5}{2}}^{-}$ 99.1-keV levels of ${\mathrm{W}}^{183}$ are found to be 188 ± 4 psec and 975 ± 40 psec, respectively.