First Observation of Yrast Band in Odd-Odd N=91 162Lu Nucleus

摘要

正 High Spin states of the odd-odd 162Lu nucleus have been studied via 147Sm(19F,4nγ)reaction at90 MeV beam energy.Level scheme for yrast band based on π[h_11/2]v[i_13/2]configuration was estab-lished,for the first time,up to Iπ=23-.This band shows the signature inversion in energy before band-bending generally appeared in this mass region.It is stressed that the signature splitting in 162Lu is biggerthan that in 160Tm which could be understood in the framewrok of the cranked shell model if taking posi-tire γ-triaxiality into account.