Isomers inTb158andHo163

Abstract

The isomeric transition in ${\mathrm{Tb}}^{158}$, with 10.5-second half-life and 111-kev transition energy, is designated $M3\mathrm{}$. The isomeric transition in ${\mathrm{Ho}}^{163}$, with 0.8-second half-life and 299-kev transition energy, is designated $E3\mathrm{}$.