First observation of yrast band in odd-odd 162Lu
High spin states of the odd-odd 162Lu nucleus have been studied via 147Sm(19F,4nγ)162Lu reaction at 95 MeV beam energy. Level scheme for yrast band based on π[h11/2]υ[i13/2] quasiparticle configuration was established up to Iπ=(23−) for the first time. This band shows the signature inversion in energy before backbending generally appeared in this mass region. It is stressed that the signature splitting in 162Lu is larger than that in the 160Tm nucleus.