Acta Physica Polonica B

Vol. 32, No. 9, September 2001, page 2545

First Evidence for the Wobbling Mode in a Triaxial Superdeformed Odd-A Nucleus

I. Hamamoto, S.W. \T1\O degård, G.B. Hagemann, D.R. Jensen, M. Bergstroem, B. Herskind, G. Sletten, S. Toermaenen, J.N. Wilson, P.O. Tjom, K. Spohr, H. Huebel, A. Goergen, G. Schoenwasser, A. Bracco, S. Leoni, A. Maj, C.M. Petrache, P. Bednarczyk, D. Curien

The wobbling mode is uniquely related to rotation of a triaxial body. The Lu--Hf isotopes with N\sim 94 provides a possible region of nuclei with pronounced triaxiality. We have investigated 163Lu through the fusion-evaporation reaction 139La(29Si,5 n)163Lu with a beam energy of 152 MeV. The electromagnetic properties of several connecting transitions between two presumably Triaxial, SuperDeformed (TSD) bands have been studied. New particle-rotor calculations in which an aligned i13/2 proton is coupled to a ``wobbling'' core are presented and evidence for the assignment of the excited TSD band as a wobbling mode built on the yrast TSD band in 163Lu is given.

PACS numbers: 21.10.--k, 23.20.Lv, 25.70.Gh, 27.60.+j

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