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HK: Physik der Hadronen und Kerne
HK 10: Poster Session: Nuclear Physics/Spectroscopy
HK 10.1: Poster
Dienstag, 12. März 2002, 10:30–12:45, Foyer Chemie
Investigation of nuclear structures in 124Xe * — •B. Saha1, A. Dewald1, O. Möller1, R. Peusquens1, A. Fitzler1, T. Klug1, I. Schneider1, D. Tonev1, K. Jessen1, K.O. Zell1, P. von Brentano1, and B.J.P. Gall2 — 1Institut für Kernphysik, Universität zu Köln, Köln, Germany — 2IReS, UMR7500IN2P3-CNRS, Université Louis Pasteur, Strasbourg, France
The so-called magnetic rotation which appears in the spectra as regular M1 bands is now a well established excitation mode seen in several lead isotopes. It is still not clear whether it also exists in the A=130 region where similar M1 bands are known, e.g in 124Xe [1] and 128Ba. Crucial experimental observables are the B(M1) values which are expected to decrease with increasing spin. Therefore we performed a recoil distance measurement (RDM) with the EUROBALL spectrometer at Strasbourg and the Köln plunger using the reaction 110Pd(18O,4n)124Xe at a beam energy of 86 MeV. Lifetimes of levels of the ground state band (gsb) as well as of the M1 band could be determined with γ-γ-coincidence data. By gating from above the levels of interest, problems due to the feeding histories of the levels could be avoided. The experimental setup will be presented and the deduced transition probabilities will be used to interprete the nuclear structures of 124Xe. Especially the bandcrossing of the gsb with the (νh11/2)2 and (πh11/2)2 s-bands will be discussed.
[1] I. Schneider et al., Phys.Rev.C 60, 014312 (1999)
The authors would like to acknowledge the support provided by the EUROBALL team.
* supported by BMBF, Project No. 06 OK 958