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Dresden 2000 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 16: Postersitzung / Kernphysik

HK 16.16: Poster

Donnerstag, 23. März 2000, 10:15–12:45, B 69

Study of oblate dipole and triaxial quadrupole bands in 142Gd with EUROBALL — •R.M. Lieder1,2, T. Rzaca-Urban2, H. Brands1, W. Gast1, H.M. Jäger1, L. Mihailescu1, Z. Pytel2, W. Urban2, T. Morek2, Chr. Droste2, S. Chmel3, D. Bazzacco4, G. Falconi4, R. Menegazzo4, S. Lunardi4, C. Rossi Alvarez4, G. de Angelis5, E. Farnea5, A. Gadea5, D.R. Napoli5, and Z. Podolyak51IKP, FZ Jülich, D-52425 Jülich — 2IEP, Univ. Warsaw, PL-00-681 Warsaw — 3ISKP, Univ. Bonn, D-53115 Bonn — 4INFN, Sezione di Padova, I-35131 Padova — 5INFN, LNL, I-35020 Legnaro

High-spin states in 142Gd have been excited in the 99Ru(48Ti,2p3n) reaction at 240 MeV and studied with EUROBALL and ISIS at the LNL, Italy. Four dipole bands have been observed which can be associated with an oblate nuclear deformation (β2 ≈ 0.15, γ ≈ −60). A ν h11/2−2 π h11/22 configuration has been assigned to DB1 and a ν h11/2−2 π h11/21g7/2−1 configuration to DB3. The bands DB2 and DB4 result from the breakup of a second h11/2 neutron-hole pair. For these configurations TAC calculations have been carried out. In general, a reasonable agreement between the experimental data and the TAC model predictions has been obtained suggesting the interpretation of the dipole bands as magnetic rotations. Furthermore, the stretched quadrupole band based on the known (π h11/2)10+2 isomer has been extended to I=34. It adopts a well-deformed triaxial shape at high spins according to calculations and is considered to facilitate the transition from highly to superdeformed shapes. (Supported by the EU, Volkswagen Foundation, FNP and KBN).

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