Dresden 2013 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 20: Struktur und Dynamik von Kernen
HK 20.8: Talk
Monday, March 4, 2013, 18:45–19:00, HSZ-401
Detailed investigation of octupole vibrational states in 168Yb — •Sorin Pascu, Vera Derya, Janis Endres, Andreas Hennig, Lars Netterdon, Simon G. Pickstone, Mark Spieker, and Andreas Zilges — Institut für Kernphysik, Universität zu Köln
The experimental evidence for the presence of octupole vibrational states in 168Yb is presented. In order to populate the excited states in this nucleus, the 166Er(α,2nγ)168Yb fusion evaporation reaction was used with a beam energy of 24 MeV. Using the coincidence method, the level scheme was corrected and extended up to 3 MeV, both for the positive and negative parity states. In a second step, the lifetimes of five excited states were measured by using the fast timing method with the Bucharest HPGe and LaBr3:Ce detector array using the triple-γ coincidence method. Reduced E1 and E2 transition probabilities were extracted from the measured lifetimes and compared, when possible, with similar observables in neighboring isotopes, showing a smooth behavior with increasing mass. The positive and negative-parity states revealed by this experiment are compared with the Interacting Boson Model and are found to be in good agreement.
Supported by the DFG (ZI 510/4-2). V. D., A. H., S. G. P., and M. S. are members of the Bonn-Cologne Graduate School of Physics and Astronomy