Abstract
The decay scheme of Ba 139 has been studied using scintillation detectors. The half-life is found to be 85 ± 3 min. Beta-gamma and gamma-gamma coincidence measurements show this decay to consist of three beta groups of 2.38, 2.23 and 0.95 MeV, leading to the ground state and two excited states of La 139, the energies of the excited states being 0.167 ± 0.003 and 1.43 ± 0.05 MeV. Transitions from these two states are to the ground state. Branching ratios of 0.72, 0.26 and 0.02 were found for the 2.38, 2.23 and 0.95 MeV beta groups, respectively. Beta-gamma delayed coincidence measurements made on the 0.167 MeV state show the half-life of this state to be 1.7 ± 0.2 ns.
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