High-spin States and K-isomers of 185Re

Abstract

The structure of 185Re was studied using inelastic excitation of an enricged 185Re target with 820 MeV 136Xe ions and the techniques of gamma-ray spectroscopy. The known level scheme of 185Re below the isomer at 2124 keV has been significantly extended. The 2124 keV long-lived isomer has been remeasured to have T1/2 = 200 ± 4 ns, and four isomers below this state have been characterised and their half-lives measured as 26 ± 2 ns at 368 keV, 1.3±0.6 ns at 1207 keV and 5.5±1.4 ns at 1411 keV. Through a comprehensive angular correlation analysis and consideration of K-forbidden transition strengths, the spins and parities of all states up to the T1/2 = 200 ns isomer at 2124 keV have been firmly identified.