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HK: Fachverband Hadronen und Kerne
HK 48: Nuclear Structure and Dynamics I
HK 48.7: Talk
Wednesday, March 18, 2009, 15:30–15:45, H-ZO 40
Lifetime measurement in 168Yb using the Recoil Distance Doppler Shift (RDDS) Method — •Michael Reese1, Alfred Dewald2, Oliver Möller1, Pavel Petkov2,3, Norbert Pietralla1, and Thomas Pissulla2 — 1TU Darmstadt, Germany — 2Universität zu Köln, Germany — 3INRNE, Bulgarian Academy of Sciences, Sofia
In the analysis of coincidence RDDS experiments one uses the Differential Decay Curve (DDC) Method to determine lifetimes of excited states. Experiments with small recoil velocities, thus small Doppler shifts, enforce the use of narrow coincidence gates to determine peak intensities. This results in a loss of statistics. As an alternative to the application of gates, we present the fit of 2-dimensional functions to the γγ coincidence data. This approach has been studied on data taken in a RDDS measurement for the ground state band of 168Yb. The 18O(154Sm,4n)168Yb* fusion evaporation reaction was induced by an 80 MeV ion beam of the tandem accelerator facility in Cologne. The target was mounted in the Cologne coincidence plunger device. Lifetimes from the 41+ to the 101+ states have been extracted. The method will be discussed and the results are compared to the CBS rotor model in the context of centrifugal stretching.