Identification of yrast high-K intrinsic states in Os188

The high-spin structure of the Z=76 nucleus Os188 has been studied using the incomplete fusion reaction Li7+W186. A Kπ=10+ band has been established up to spin (24+) and its crossing with the ground-state band has been studied. In addition, intrinsic high-K states have been identified and on top of two of them, Kπ=7- and Kπ=10-, regular bands have been observed. The Kπ=16+ and Kπ=18+ states are yrast whereas the Kπ=14+ level lies only 33 keV above the yrast line and decays with a low reduced hindrance of fν<1.3 to the ground-state band (ΔK=14). The results are discussed by means of a systematic comparison with the even-even neighboring nucleus Os186. Configuration-constrained multiquasiparticle potential-energy-surface calculations have been performed to identify the configurations of multiquasiparticle states.