Bochum 2018 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 52: Poster
HK 52.15: Poster
Donnerstag, 1. März 2018, 16:30–18:45, Audimax Foyer
Lifetime determination of nuclear levels using a new Doppler-shift attenuation approach — •Anna Bohn1, Michelle Färber1, Miriam Müscher1, Simon G. Pickstone1, Sarah Prill1, Philipp Scholz1, Mark Spieker1,2, Vera Vielmetter1, Michael Weinert1, Julius Wilhelmy1, and Andreas Zilges1 — 1Institute for Nuclear Physics, University of Cologne — 2NSCL, Michigan State University, MI 48824, USA
The measurement of nuclear level lifetimes via the Doppler-shift attenuation method (DSAM) using proton-γ coincidences is well established at the 10 MV FN-Tandem accelerator in Cologne [1]. The SONIC@HORUS setup allows to determine excitation energy, recoil velocity and direction of the target nuclei [2]. In the standard analysis, the attenuation factor F(τ) has been determined by comparing the Doppler-shift at different photon emission angles θ and using that F(τ) represents the slope of Eγ(cos(θ)). In this contribution a new approach will be introduced, in which the data are first Doppler-corrected and summed up, assuming different F(τ) values. Then, for each line, the optimum F(τ) yielding the best peak shape is determined. Due to the highly improved peak-to-background ratio, lifetimes of weaker transitions might also be extracted. Furthermore, first results from DSAM experiments on 130Te and 128Te using this method will be presented.
Supported by DFG (ZI 510/7-1). JW is supported by the Bonn-Cologne Graduate School of Physics and Astronomy.
A. Hennig et al., NIM A 794 (2015) 171
S. G. Pickstone et al., NIM A 875 (2017) 104