Köln 2004 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 29: Nuclear Structure/Spectroscopy V
HK 29.3: Gruppenbericht
Mittwoch, 10. März 2004, 15:00–15:30, A
Structure of the Te Isotopes — •N. Warr1, A. Dewald1, Ch. Fransen1, P.E. Garrett2, S.F. Hicks3, J. Jolie1, A. Linnemann1, O. Möller1, J.R. Vanhoy4, T. von Egidy5, and S.W. Yates6 — 1Institut für Kernphysik, Zülpicherstr. 77, D-50937 Köln, Germany — 2Lawrence Livermore National Laboratory, Livermore, California 94551, USA — 3Dept. of Physics, University of Dallas, Irving, TX 75062, USA — 4Dept. of Physics, United States Naval Academy, Annapolis, Maryland 21402, USA — 5Physik-Department, Technische Universität München, D-85748 Garching, Germany — 6Dept. of Chemistry, University of Kentucky, Lexington, KY 40506, USA
The level structures of several Te isotopes have been examined utilizing γ-ray spectroscopy following the (α, 2nγ) reaction and the In β− decay. Excitation functions, γγ coincidences and angular distributions were measured. Spectroscopic information, e.g. spins, branching ratios and multipole mixing ratios, was obtained for many new levels below 4.5 MeV in excitation energy. The level schemes were examined from the viewpoint of an anharmonic vibrator model, the general collective model, the particle-core coupling model and IBM-based intruder models. Particular aspects of the level sequence can be reproduced by each of these models, but the agreement with transition rate data is modest. New absolute B(E2) values were obtained for the light Te isotopes 114Te and 120Te, which show deviations from the anharmonic vibrator values contrasting to what can be deduced from energies and B(E2) ratios alone.