Half-Lives and Gamma-Ray Abundances of Several Rare-Earth Nuclides

Abstract

New half-life values are given for ${}_{}{}^{145}{}_{}{}^{}\mathrm{Eu}$, ${}_{}{}^{146}{}_{}{}^{}\mathrm{Gd}$, ${}_{}{}^{149}{}_{}{}^{}\mathrm{Eu}$, ${}_{}{}^{151}{}_{}{}^{}\mathrm{Tb}$, ${}_{}{}^{153}{}_{}{}^{}\mathrm{Sm}$, ${}_{}{}^{153}{}_{}{}^{}\mathrm{Tb}$, ${}_{}{}^{153}{}_{}{}^{}\mathrm{Dy}$, ${}_{}{}^{155}{}_{}{}^{}\mathrm{Tb}$, and ${}_{}{}^{155}{}_{}{}^{}\mathrm{Dy}$. Absolute abundances are reported for prominent $\gamma$ rays associated with the decay of ${}_{}{}^{143}{}_{}{}^{}\mathrm{Pm}$, ${}_{}{}^{146}{}_{}{}^{}\mathrm{Gd}$, ${}_{}{}^{149}{}_{}{}^{}\mathrm{Pm}$, ${}_{}{}^{149}{}_{}{}^{}\mathrm{Eu}$, and ${}_{}{}^{153}{}_{}{}^{}\mathrm{Dy}$.