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Münster 2011 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 3: Struktur und Dynamik von Kernen I

HK 3.5: Talk

Monday, March 21, 2011, 15:15–15:30, O-1

Collectivity in the yrast band of 168Yb — •Pavel Petkov1,2, Alfred Dewald1, Oliver Möller3, Isabelle Deloncle4, Dimitar Tonev2, Michael Reese3, Christoph Fransen1, Matthias Hackstein1, Thomas Pissulla1, Wolfram Rother1, Jan Jolie1, and Karl-Oskar Zell11Institut für Kernphysik der Universität zu Köln, Köln, Germany — 2Institute for Nuclear Research and Nuclear Energy, BAS, 1784 Sofia, Bulgaria — 3Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, Germany — 4CSNSM, IN2P3/CNRS and Université Paris-Sud, F-91405 Orsay Campus

The lifetimes of four low-lying levels of the yrast band in 168Yb, populated via the 154Sm(18O,4n) reaction, were measured for the first time by means of the recoil-distance Doppler-shift method. For the data-analysis we applied the differential decay-curve method in a version where gates are set on both shifted and unshifted components. The reduced transition probabilities indicate some reduction of the collectivity for states above the 6+ level, i.e. well below the band-crossing, which may be understood as the result of an interaction between the rotational ground-state band and yet unknown part of the two-quasiparticle ((ν13/2)) spin-aligned S-band or alternatively, as changes in the internal structure induced by the rotation.

This work was supported by the DFG within the East-European-Germany collaboration program and contracts No. Jo391/5-1 and No. Jo391/12-1.

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