Darmstadt 2016 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 13: Structure and Dynamics of Nuclei IV

HK 13.2: Vortrag

Montag, 14. März 2016, 17:00–17:15, S1/01 A04

Lifetime measurements in ¹⁷⁰Yb using the Generalized Centroid Difference Method — •Vasil Karayonchev, Jean-Marc Régis, Jan Jolie, Moritz Dannhoff, Nima Saed-Samii, and Andrey Blazhev — Institute of Nuclear Physics, University of Cologne, Cologne, Germany

An experiment using the electronic γ−γ "fast-timing" technique was performed at the 10MV Tandem Van-De-Graaff accelerator of the Institute for Nuclear Physics, Cologne in order to measure lifetimes of the yrast states in ¹⁷⁰Yb. The lifetime of the first 2⁺ state was determined using the slope method, which means by fitting an exponential decay to the "slope" seen in the energy-gated time-difference spectra. The value of τ=2.201(57) ns is in good agreement with the lifetimes measured using other techniques. The lifetimes of the first 4⁺ and the 6⁺ states are determined for the first time. They are in the ps range and were measured using the generalized centroid difference method, an extension of the well-known centroid-shift method and developed for fast-timing arrays. The derived reduced transition probabilities B(E2) values are compared with calculations done using the confined beta soft model and show good agreement within the experimental uncertainties.

This work is supported by the DFG under grant JO 391/16-1.