2018 Impact factor 2.481
Hadrons and Nuclei


Eur. Phys. J. A 13, 291-296 (2002)

Lifetimes of triaxial superdeformed states in $\chem{^{163}Lu}$ and $\chem{^{164}Lu}$

G. Schönwaßer1, H. Hübel1, G.B. Hagemann2, J. Domscheit1, A. Görgen1, B. Herskind2, G. Sletten2, J.N. Wilson2, D.R. Napoli3, C. Rossi-Alvarez4, D. Bazzacco4, R. Bengtsson5, H. Ryde6, P.O. Tjøm7 and S.W. Ødegård7

1  Institut für Strahlen und Kernphysik, Nussallee 14-16, Universität Bonn, D-53115 Bonn, Germany
2  The Niels Bohr Institute, Blegdamsvej 17, DK-2100 Copenhagen Ø, Denmark
3  Laboratori Nazionali di Legnaro, INFN, I-35020 Legnaro, Italy
4  Dipartimento di Fisica and INFN, I-35131 Padua, Italy
5  Department of Mathematical Physics, Lund Institute of Technology, S-22362 Lund, Sweden
6  Department of Physics, University of Lund, S-22362 Lund, Sweden
7  Department of Physics, University of Oslo, PB 1048 Blindern, N-0316 Oslo, Norway

hubel@iskp.uni-bonn.de

(Received: 8 November 2001 Communicated by D. Schwalm)

Abstract
Lifetimes of states in the yrast superdeformed bands of 163Lu and 164Lu were determined in a Doppler-shift attenuation-method experiment. From fractional Doppler shifts and line shapes, average transition quadrupole moments, $Q_{\rm t} =
8.2_{-0.6}^{+1.0}$ b and 7.1-0.6+0.5 b, were deduced for one of the bands in 163Lu and 164Lu, respectively. These values are much larger than the quadrupole moment of the normal-deformed yrast band in 163Yb, $Q_{\rm t} =
4.9_{-0.4}^{+1.3}$ b, that was also determined in this experiment. Comparison to cranking calculations indicates that both superdeformed bands correspond to a local potential energy minimum with a pronounced triaxiality, $\gamma\sim 20^\circ$.

PACS
21.10.-k - Properties of nuclei; nuclear energy levels.
21.10.Tg - Lifetimes.
25.70.-z - Low and intermediate energy heavy-ion reactions.
27.70.+q - $150 \leq A \leq 189$ .

© Società Italiana di Fisica, Springer-Verlag 2002