The Energy Levels of Te¹²⁹

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The decay of Sb¹²⁹ has been studied with Li-drifted germanium and scintillation spectrometers. Singles and β-γ and γ-γ coincidence spectra were observed. Gamma rays with energies 180, 296, 358, 410, 523, 544, 652, 683, 760, 813, 876, 916, 967, 1028, 1048, 1240, 1300, 1520, 1730, 1840 and 2070 keV, and beta branches with end-point energies 0.58, 0.70, 1.06, 1.55, 1.82 and 2.24 MeV were found. The relative intensities of these gamma and beta rays were estimated. The half-life of Sb¹²⁹ was determined to be 4.35±0.05 h. The present data are consistent with a level scheme with states at 544, 813, 1227, 1637, 1729, 1841 and 2064 keV.