Eur. Phys. J. A (2004) 19: 173-185
https://doi.org/10.1140/epja/i2003-10120-5

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

¹ The Niels Bohr Institute, Blegdamsvej 17, DK-2100, Copenhagen Ø, Denmark
² Department of Mathematical Physics, LTH, University of Lund, Lund, Sweden
³ Department of Physics, University of Oslo, PB 1048 Blindern, N-0316, Oslo, Norway
⁴ Department of Electronic Engineering and Physics, University of Paisley, UK
⁵ Helmholtz-Institut für Strahlen- und Kernphysik, University of Bonn, Nußallee 14-16, D-53115, Bonn, Germany
⁶ Mississippi State University, MS 39762, Mississippi State, USA
⁷ Dipartimento di Fisica and INFN, Sezione di Milano, Milano, Italy
⁸ Niewodniczanski Insitute of Nuclear Physics, Krakow, Poland
⁹ Dipartimento di Fisica and INFN, Sezione di Padova, Padova, Italy
¹⁰ Dipartimento di Matematica e Fisica, Universitá di Camerino, Camerino, Italy
¹¹ IReS, 23 rue du Loess, BP28, F-67037, Strasbourg, France

^* e-mail: hagemann@nbi.dk

Abstract

High-spin states of the nucleus ¹⁶³Lu have been populated through the fusion-evaporation reaction ¹³⁹La(²⁹Si, 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 ¹⁶³Lu.