Institution: | Institut für Strahlen und Kernphysik, Nussallee 14-16, Universit?t Bonn, D-53115 Bonn, Germany, DE The Niels Bohr Institute, Blegdamsvej 17, DK-2100 Copenhagen ?, Denmark, DK Laboratori Nazionali di Legnaro, INFN, I-35020 Legnaro, Italy, IT Dipartimento di Fisica and INFN, I-35131 Padua, Italy, IT Department of Mathematical Physics, Lund Institute of Technology, S-22362 Lund, Sweden, SE Department of Physics, University of Lund, S-22362 Lund, Sweden, SE Department of Physics, University of Oslo, PB 1048 Blindern, N-0316 Oslo, Norway, NO
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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
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
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, γ∼ 20°.
Received: 8 November 2001 / Accepted: 9 January 2002 |