Abstract
A study of the 231Th excited levels from the alpha decay of 235U is carried out. The alpha-particle spectrum was measured by means of a semiconductor counter spectrometer with an effective resolution of 18 keV. Nineteen new lines were identified. The gamma-ray spectrum was measured with thin samples of 235U, which were free from decay products and in such geometrical conditions that most of the interference effects were eliminated. From the experimental data a new decay scheme was proposed, where new rotational terms, belonging to the Nilsson states 5 2 + (633), 1 2 + (631), 3 2 + (631) 5 2 + (622), 5 2 − (752) 3 2 − (761) and 7 2 − (743) , were identified.
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