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HK: Fachverband Physik der Hadronen und Kerne
HK 52: Poster (b)
HK 52.12: Poster
Donnerstag, 2. April 2020, 16:30–18:30, Grotte
Ongoing investigation of a new Doppler-shift attenuation-approach to determine nuclear-level lifetimes — •Anna Bohn, Vera Everwyn, Michelle Färber, Florian Kluwig, Miriam Müscher, Sarah Prill, Philipp Scholz, Michael Weinert, Julius Wilhelmy, and Andreas Zilges — Institute for Nuclear Physics, University of Cologne
The Doppler-shift attenuation-method is a well-established technique to determine nuclear-level lifetimes in the range of sub-picoseconds. Such experiments are performed at the combined detector array SONIC@HORUS at the 10 MV FN-Tandem accelerator in Cologne, which provides complete knowledge of the reaction kinematics via particle-γ coincidences [1-3].
An alternative analyzing technique has been tested where the entire data set is Doppler corrected by assuming different values for the attenuation factor F(τ), which connects the lifetime τ to the observed energy shift of the de-exciting γ-ray. The optimal attenuation factor, which minimizes the Doppler broadening of the analyzed γ peak, yields the lifetime. This procedure uses summed up statistics and thus might be more efficient for weakly excited states. First results on 130Te are in good agreement with known level lifetimes. Further tests to benchmark the new technique are planned.
Supported by DFG (ZI 510/9-1). A.B. is supported by the BCGS.
[1] A. Hennig et al., Nucl. Instr. and Meth. A 794 (2015) 171
[2] M. Spieker et al., Phys. Rev. C 97 (2018) 054319
[3] S. G. Pickstone et al., Nucl. Instr. and Meth. A 875 (2017) 104