Decay ofI134

The decay properties of 53-min ${\mathrm{I}}^{134}$ have been investigated with scintillation techniques as part of a program for the systematic study of xenon energy levels. Energies (and intensities) of the gamma rays determined from the single-crystal and coincidence studies are 0.135 (3.2), 0.18, 0.23, 0.27, 0.32, 0.39 (7.2), 0.41 (0.6), 0.43 (2.9), 0.51 (0.9), 0.54 (8.4), 0.61 (19), 0.69 (7.3), 0.75 (1.3), 0.77 (6.0), 0.848 (100), 0.864 (4.6), 0.890 (74), 0.96 (2.0), 1.00 (4.7), 1.07 (18), 1.15 (10), 1.28 (1.4), 1.34 (1.5), 1.46 (3.7), 1.49 (1.0), 1.62 (4.9), and 1.79 (4.9) Mev. There are two gamma rays at each energy of 0.89 and 1.07 Mev. The single-crystal spectra were corrected experimentally for gamma-ray summing. Gamma coincidence spectra were measured by gating at energies of 0.135, 0.41, 0.61, 0.85, 0.89, 1.00, 1.07, 1.15, 1.46, 1.62, and 1.79 Mev in the gamma-ray spectrum. Beta-ray spectra were measured in coincidence with gamma rays at 0.85, 1.00, 1.07, 1.15, 1.46, 1.62, and 1.79 Mev. These measurements and the single-crystal data disclosed beta rays with end-point energies of 2.41, 2.21, 1.68, 1.49, 1.25, and 1.05 Mev. In a three-crystal "beta-gamma-gamma" experiment the 2.41-Mev beta-ray group was shown to populate a level in ${\mathrm{Xe}}^{134}$ at 1.74 Mev; therefore, the energy difference between the ground states of ${\mathrm{I}}^{134}$ and ${\mathrm{Xe}}^{134}$ is 4.15±0.06 Mev.