Elsevier

Nuclear Physics A

Volume 95, Issue 1, 27 March 1967, Pages 202-208
Nuclear Physics A

A spin 112 isomer in 157Gd

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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 112[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 52+[642] Nilsson state, itself forming an isometric level at 64 keV and with half-life of t12 = 0.46 μs.

Comparison of stripping and pick-up reaction data with theory shows that the 112[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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Present address: The Swedish Research Council's Laboratory, Studsvik, Nyköping, Sweden.

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