SMuK 2021 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 15: Structure and Dynamics of Nuclei I

HK 15.2: Group Report

Tuesday, August 31, 2021, 17:00–17:30, H4

DSAM lifetime measurements using particle-γ coincidences at SONIC@HORUS — •Sarah Prill, Anna Bohn, Christina Deke, Felix Heim, Michael Weinert, and Andreas Zilges — University of Cologne, Institute for Nuclear Physics, 50937 Köln, Germany

The Doppler-shift attenuation method (DSAM) has been used in recent years to successfully determine lifetimes of excited low-spin states of various nuclei in the sub-picosecond range [1,2]. Especially by the use of particle-γ coincidence data taken at the SONIC@HORUS spectrometer in Cologne [3], the direct selection of levels via their excitation energy is possible. This greatly reduces background and eliminates feeding from levels of higher energies, as well as gives complete knowledge over the reaction kinematics. This contribution will give an overview of the method and show recent results from experiments on Ru, Sn [2] and Te isotopes. Additionally, a complementary approach to the conventional DSA technique to extract lifetimes from weak transitions and excited states with low statistics will be presented. A first estimation of its feasibility is discussed.
Supported by the DFG (ZI-510/9-1).
[1] A. Hennig et al., Nucl. Instr. and Meth. A 794 (2015) 717.
[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.