The decays of the 4.7-day ${}_{}{}^{119m}{}_{}{}^{}\mathrm{Te}$ and the 16-h ${}_{}{}^{119g}{}_{}{}^{}\mathrm{Te}$ have been investigated with the use of Ge(Li) and NaI(Tl) $\gamma$-ray detectors, and Si(Li) electron detectors. Coincidence relationships among the $\gamma$ rays were determined in $\gamma -\gamma$ coincidence experiments. It was established that the decay of the 4.7-day ${}_{}{}^{119m}{}_{}{}^{}\mathrm{Te}$ populates levels at 270.6, 1048.3, 1212.7, 1249.6, 1365.8, 1406.7, 2129.3, 2226.0, 2277.8, 2283.6, and 2360.4 keV in ${}_{}{}^{119}{}_{}{}^{}\mathrm{Sb}$; and the decay of the 16-h ${}_{}{}^{119g}{}_{}{}^{}\mathrm{Te}$ populates levels at 270.6, 644.3, 700.0, 1338.5, 1413.2, 1487.4, 1749.5, and 1821.0 keV in ${}_{}{}^{119}{}_{}{}^{}\mathrm{Sb}$. Many spin assignments have been made from present and previously reported internal-conversion-electron data, from $log\mathrm{ft}$ values, and from $\gamma -\gamma$ directional correlation measurements. Trends of the low-lying levels of odd-$A$ antimony isotopes from mass 119 to 125 are discussed and compared with the pairing-plus-quadrupole model for nuclei.

• Received 15 December 1966

DOI:https://doi.org/10.1103/PhysRev.158.1183