Bonn 2010 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 6: Struktur und Dynamik von Kernen II

HK 6.2: Talk

Monday, March 15, 2010, 17:00–17:15, HG V

Robust test of E(5) symmetry in ¹²⁸Xe — •Laurent Coquard¹, Norbert Pietralla¹, Tan Ahn^1,2, 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.