Coexisting wobbling and quasiparticle excitations in the triaxial potential well of ~(163)Lu

摘要

High-spin states of the nucleus ~(163)Lu have been populated through the fusion-evaporation reaction ~(139)La(~(29)Si, 5n) with a beam energy of 157 MeV. In addition to the two lowest excited triaxial strongly deformed (TSD) bands, recently interpreted as one- and two-phonon wobbling excitations, a third excited TSD band has been firmly established decaying to the yrast TSD band. The assignment of this band as a three-quasiparticle band shows together with the normal deformed (ND) level scheme the presence not only of shape coexistence between ND and TSD structures, but also an interplay of wobbling and quasiparticle excitations in the triaxial strongly deformed potential well of ~(163)Lu.