Spin and Parity Assignments and Levels inGd156Populated by the Decay ofTb156

Accurate conversion-electron intensities and $\gamma$-ray intensities were combined to obtain $K$ conversion coefficients for 80 transitions in ${}_{}{}^{156}{}_{}{}^{}\mathrm{Gd}$ from the decay of 5.4-day ${}_{}{}^{156}{}_{}{}^{}\mathrm{Tb}$. These data were used to make spin and parity assignments for the following levels: 1538.90, ${\mathrm{}\left(3\right)\mathrm{}}^{-}$; 1851.84, $3^{-}$; 1948.98, $3^{-}$; 1952.32, $4^{-}$; 2175.08, $3^{-}$, $4^{-}$; and 2232.52 keV, $3^{-}$, $4^{-}$. Levels at 1462.26, 1506.89, and 1538.90 keV are now established on the basis of coincidence data. A complete level scheme is presented that incorporates all of the different features seen in recent studies.