Bonn 2010 – wissenschaftliches Programm
HK 6.2: Vortrag
Montag, 15. März 2010, 17:00–17:15, HG V
Robust test of E(5) symmetry in 128Xe — •Laurent Coquard1, Norbert Pietralla1, Tan Ahn1,2, Georgi Rainovski3, Linus Bettermann4, Michael Carpenter5, Robert Janssens5, Jörg Leske1, Christopher Lister5, Oliver Möller1, Wolfram Rother4, Volker Werner2 und Shaofei Zhu5 — 1Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany — 2Wright Nuclear Structure Laboratory, Yale University, New Heaven, CT 06520, USA — 3Faculty of Physics, St. Kliment Ohridski University of Sofia, 1164 Sofia, Bulgaria — 4Institut für Kernphysik, Universität Köln, Zülpicher Str. 77, 50937 Köln, Germany — 5Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
Low-lying collectively excited states of 128Xe have been investigated by γ-ray spectroscopy following the 12C(128Xe,128Xe*)12C projectile Coulomb excitation reaction. 19 absolute E2 transition strengths have been obtained including the first measurement of the critical B(E2) decays from the 02+ and 03+ states. These data are compared with the theoretical predictions of the critical point symmetry E(5) and let us conclude that 128Xe is not an E(5) nucleus as previously suggested, leaving 130Xe as the most likely candidate amongst the xenon isotopes. This work was partially supported by the U.S. Department of Energy, Office of Nuclear Physics, under Contract No. DE-AC02-06CH11357, by the DFG under grant Nos. Pi 393/2-1 and SFB 634, by the Helmholtz International Center for FAIR and by the German-Bulgarian exchange programme under grant Nos. D/08/02055 and DO02-25.