Disintegration ofTe119

The disintegration of ${\mathrm{Te}}^{119}$ has been studied with the help of magnetic spectrometers and scintillation counters. Two half-lives are observed—one of 4.7±0.3 days and one of ∼16 hours. These represent the decay from two isomeric states. The isomeric transition is not observed because of the strong competition from the decay to states of ${\mathrm{Sb}}^{119}$. The 4.7-day disintegration occurs by electron capture and exhibits gamma rays of the following energies: 0.153, 0.270, 0.930, 1.10, 1.22, and 2.12 Mev. The following coincidences are observed: (2.12, 0.270), (1.22, 0.930, 0.153), (1.10, 0.270). The $\frac{K}{\mathrm{}(L+M)\mathrm{}}$ ratio for the line at 0.153 Mev is 7.85 and for the line at 0.270 Mev is 5.77. The 16-hour isomer exhibits positrons of end-point energy 0.627 Mev; and two gamma rays of energy 1.76 and 0.645 Mev. A disintegration scheme is given.