Münster 2002 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 39: Nuclear Physics / Spectroscopy VI
HK 39.4: Vortrag
Donnerstag, 14. März 2002, 15:00–15:15, B
Lifetimes of triaxial superdeformed states in 163Lu and 164Lu* — •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 — 1ISKP, Univ. Bonn, Germany — 2NBI, Copenhagen, Denmark — 3LNL, Legnaro, Italy — 4Dip. di Fisica, Univ. Padova, Italy — 5Dep. of Math. and Phys., Lund Inst. of Technology, Sweden — 6Dep. of Phys., Univ. Lund, Sweden — 7Dep. of Phys., Univ. Oslo, Norway
Lifetimes of states in the yrast superdeformed bands of 163Lu and 164Lu were determined in a Doppler-shift attenuation-method experiment. High-spin states were populated in the reaction 139La(29Si,xn) at 145 MeV. The beam was provided by the Legnaro Tandem accelarator. Gamma-ray coincidences were measured with the GASP Ge-detector array. From fractional Doppler-shifts and line shapes, average transition quadrupole moments, Qt = 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, Qt = 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∼ 200.
* Work supported by BMBF, Germany (contract no. 06 BN 907) and by the EU (TMR/LSF contract no. ERBFMGECT980110)