Abstract
Gamma-ray transitions following the decay of 133Ba to 133Cs were investigated with a calibrated Ge(Li) detector. The K-electron internal conversion coefficients were found from the relative gamma intensities used in conjunction with published K-conversion electron intensities. Internal conversion coefficients were calculated from the internal conversion ratios. The measured energies of the gamma rays in keV and the absolute intensities in gammas per 100 disintegrations are 53.4 2±0.25 (1.9 6±0.22), 81.1 5±0.26 (33. 4±5.0), 160.5 8±0.27 (0.62 6±0.074), 223.2 1±0.45 (0.41 6±0.051), 276.5 0±0.32 (6.0 1±0.67), 303.0 0±0.63 (15.3 9±0.17), 356.3 2±0.48 (51. 7±5.7) and 384.1 3±0.42 (7.3 4±0.82). Electron capture branching ratios and log ft values leading to the 437, 384, 161 and 81 keV levels of 133Cs are 0.71 6±0.086 (6.35 −0.04 +0.07), 0.22 0±0.024 (7.71±0.05), 0.005 8±0.0070 (10.0 −0.4 +∞ and 0.05 8±0.11 (9.3 −0.5 +∞). Branching ratios of transitions and experimental gamma-decay transition probabilities are given. The results are compared with theoretical estimates from the single-proton model. Retardation and enhancement factors calculated from the results are discussed.
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