Decay ofI134

Abstract

The decay properties of 53 min I/sup 1//sup 3//sup 4/ were investigated with scintillation techniques. Energies (and intensities) of the rays determined from the single-cryatal and coincidence studies were 0.135 (3.2), 0.18, 0.23, 0.27, 0.32, ergies 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, Beta-ray spectra were measured in coincidence with 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, gamma- gamma experiment the 2.41-Mev beta-ray group was shown to populate a level in Xe/ sup 1//sup 3//sup 4/ at 1.74 Mev; therefore, the energy difference between the ground states of I/sup 1//sup 3//sup 4/ and Xe/sup 1//sup 3//sup 4/ was 4.15 plus or minus 0.06 Mev. A decay scheme was proposed with energy levels (and spins) in Xe/sup 1//sup 3//sup 4/ at 0.85 (2+), 3.30, and 3.41 Mev. A collective nature of the low-lying levels was suggested in that the 1.62 and 1.74 Mev states appeared to be members of a vibrational doublet at aboutmore » twice the energy of the first excited state. The half-life of I/sup 1//sup 3//sup 4/ was redetermined as 52.8 plus or minus 0.3 min (auth)« less