Abstract
Abstract A study of 166 Tm by the 160 Gd( 11 B,5nγ) reaction was performed with the aim for searching for low-energy isomeric transitions using the Recoil Shadow Method (RSM). γ-rays from the production target and from the recoil ions stopped on an annular carbon catcher placed 16 cm downstream were observed with Ge detectors. Singles spectra following bombardment at three different energies, and coincidence spectra, were measured. Six isomeric γ-rays were observed. New levels are established and their configuration assignments are proposed. One of these levels, at ( x + 109.3) keV, is isomeric with a half-life of 340(25) ms. An upper limit for x was set to 25 keV. The half-life of the yrast band head was determined to be 2(1) μs. Two alternatives for the decay path of the 340(25) ms level to the ground state are proposed. The structure of the low-lying { p 7 2 + [404] + n 5 2 − [523]}K π = 6 − band is established for the first time.
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