Abstract
The decay properties of 134I obtained from fission products have been investigated with NaI(Tl) and Ge(Li) detectors. Energies (and relative intensities) of the gamma rays determined from the Ge(Li) detector and NaI(Tl)-Ge(Li) coincidence studies are 136(5.0), 236(weak), 405(8.4), 433(4.2), 488(weak), 514(4.1), 541(9.8), 596(11.6), 622(10.3), 633(3.1), 644(weak), 677(7.7), 733(weak), 768(3.9), 848(100.0), 859(6.1), 873(weak), 885(69.1), 905(weak), 923(weak), 948(6.4), 976(5.4), 1041(3.2), 1073(17.1), 1103(2.3), 1138(11.8), 1458(4.3), 1615(4.7), 1743(3.0) and 1810(6.2) keV. Gamma-ray coincidence spectra with the Ge(Li) detector were obtained with six gates; the lower half, the upper half and the total peaks of gamma-ray at 0.87 and 1.80 MeV in the NaI(Tl) gamma-ray spectrum. Anisotropy measurements for the 885-848, 1073-848 and 1138-885 keV cascades were carried out, and the possible spin sequences were given. A decay scheme is proposed with energy levels (and spins) in 134Xe at 848(2 +), 1615(2 +), 1733(4 +), 1921(3,2), 2138, 2274, 2355, 2410, 2591, 2658, 2870(4.5), 3224and 3379 keV. The levels, which are populated by strong beta groups, are also confirmed by a summing spectrum measurement. The half-life of 134I was obtained to be 52.5 ± 0.1 min.
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