Abstract
Single γ-ray spectra, γγ-coincidences and delayed coincidences were measured with Ge(Li) and scintillation detectors. Taking into account the known conversion electron data a decay scheme was established. The half-life of the 5 2 + [402]p; 1 2 − [510]n state at 235.7 keV is 600 ± 30 ns, the half-life of the 5 2 +[402] p; 3 2 −[512] n state at 263.3 keV is 5.1 ± 0.2 ns. The E1 gamma transitions from both levels are forbidden by the omega selection rule and, therefore, extraordinarily retarded.
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