Abstract
Abstract The decay of 129Ba has been investigated with Ge(Li) and scintillation detectors used in both singles and coincidence modes. A total of 118 γ-rays are assigned to the decay of this isotope. Precise energies and intensities have been determined and are compared with internal conversion measurements. A decay scheme incorporating 100 γ-transitions is proposed on the basis of coincidence experiments and energy sums. The multipolarities of low-energy transitions up to 221 keV are calculated from a knowledge of the K- and L-con version electron intensities and our γ-ray intensities. Spins for the first few levels in 129Cs are suggested on the basis of gB-decay characteristics and the multipolarities of the low-energy transitions. The low spin state of 129Ba decays to the 1 2 + ground state and to the 135 and 221 keV levels of 129Cs with a large positon branching, whereas no positon decay has been observed from the high-spin state of 129Ba.
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