Abstract
Through the reaction 154Sm(α, n), a 17 μm half-life isomer at 425 keV in 157Gd is investigated by means of a pulsed-beam technique. For several reasons, the isomeric level is believed to be the 11 2 −[505] Nilsson state. The decay is studied by using a Ge detector and by prompt as well as delayed coincidence techniques. The decay proceeds through two rotational bands, viz., the ground state band and a band built on the 5 2 +[642] Nilsson state, itself forming an isometric level at 64 keV and with half-life of t 1 2 = 0.46 μ s . Comparison of stripping and pick-up reaction data with theory shows that the 11 2 −[505] Nilsson state is a hole state. By bombardment of 152Sm and 150Sm with α-particles, isomeric decays were observed; the half-lives being 31 ms and 84 μs, respectively.
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