Abstract
Sources of 24 d Th 234(UX 1) in equilibrium with its daughters, 1.14 min Pa 234(UX 2) and 6.75 h Pa 234(UZ) were studied with a six-gap β-spectrometer, scintillation spectrometers and with e-γ and β-γ coincidence techniques. Quantitative chemical separation of the three nucleides was performed and the individual γ-spectra and disintegration rates were measured. The short lived Pa 234 isomer was found to populate three intrinsically excited states in U 234, a state with ( K, I, π) = (0, 1 −) at (790±5) keV, a (0, 0 +) state at 811 keV and another (0, 0 +) state at 1045 keV. Detailed results on β-, γ- and electric monopole transitions are presented and discussed. By applying three independent methods the relative disintegration rates of UX 2 and UZ were found to be 100 to 0.13±0.03. A 70–73 keV isomeric transition of corresponding intensity was found in the conversion line spectrum. The possible assignments of the Pa 234 levels are discussed.
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