Nuclear Energy States ofI129

The quantum radiations emitted in the decay of ${\mathrm{Te}}^{129m}-{\mathrm{Te}}^{129}$ have been investigated with application of a Ge(Li) detector, scintillation counters, coincidence techniques, and multichannel analysis. In addition to the well-known 27-keV gamma ray, twenty-three others have been detected at energies of 205, 250, 273, 277, 340, 448, 455, 482, 523, 548, 550, 630, 660, 698, 725, 770, 797, 810, 835, 945, 1085, 1112, and 1222 keV. Thus, six pairs of gamma rays are present which exhibit within each pair an energy difference of 27 keV. Excited states in ${\mathrm{I}}^{129}$ are established at 27, 277, 482, 550, 725, 797, and 1112 keV by this energy difference. Additional excited states are found at 837, 1065, 1222, and 1385 keV by coincidence experiments.