High-spin states of rotational bands built upon νi_(13/2) in ~(166)Lu

摘要

High-Spin states of odd-odd ~(166)Lu were populated using the ~(139)La(~(30)Si, 3nγ)~(166)Lu at a beam energy of 120 MeV. Twelve new γ-rays were placed on top of the previously known two rotational bands built upon πg_(7/2) direct X νi_(13/2) and πh_(11/2) direct X νi_(13/2). Extending high-spin states up to 21~+ and 25~- for each band, we have observed the onset of band crossing near hω_c ≈ 0.35 MeV. The band crossing frequency of the yrast πh_(11/2) direct X νi_(13/2) band is consistent with the neutron BC band crossing observed in lighter odd-odd Lu isotopes.