Energy Levels inGd156Populated by 5.4-DayTb156

$\gamma$-ray singles and coincidence measurements have been carried out on the decay of ${}_{}{}^{156}{}_{}{}^{}\mathrm{Tb}$ with Ge(Li) detectors to study levels of ${}_{}{}^{156}{}_{}{}^{}\mathrm{Gd}$. A total of 102 transitions were observed, of which 52 were previously unreported. Of these 78 were placed in the decay scheme with levels at: 88.967, $2^{+}$0; 288.16, $4^{+}$0; 584.74, $6^{+}$0; 1129.52, $2^{+}$0; 1154.23, $2^{+}$2; 1242.5, $1^{-}$(0); 1248.08, $3^{+}$2; 1258.4, $2^{+}$0; 1276.22, $3^{-}$(0); 1297.7, $4^{+}$0; 1319.69, $2^{-}$(1); 1355.52, $4^{+}$2; 1366.6, $1^{-}$(1); 1462.4, $4^{+}$0; 1468.5, ($4^{-}$1); 1510.67, $4^{+}$(4); 1539.0, ($3^{-}$1); 1622.64, $5^{+}$(4); 1852.09, $3^{-}$(2); 1943.41, $3^{-}$; 2045.04, $4^{-}$(4); 2103.49, $3^{-}$; 2175.6, 2181.5, and 2232.9 keV. The spin, parity, and $K$ assignments are given where known after each level. 12 of these levels are reported in this decay for the first time.