SMuK 2023 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

HK: Fachverband Physik der Hadronen und Kerne

HK 41: Structure and Dynamics of Nuclei VII

HK 41.1: Gruppenbericht

Mittwoch, 22. März 2023, 15:45–16:15, SCH/A118

Lifetime measurements via the coincidence Doppler-shift attenuation method in Cologne — •Anna Bohn, Christina Deke, Felix Heim, Sarah Prill, Michael Weinert, and Andreas Zilges — University of Cologne, Institute for Nuclear Physics, Germany

A powerful tool to determine nuclear level lifetimes in the sub-picosecond regime is the coincidence Doppler-shift attenuation method (DSAM) [1,2]. The target is positioned inside the combined particle-γ detector array SONIC@HORUS [3]. This allows reconstruction of the complete reaction kinematics for each event. Therefore, feeding contributions from higher lying states to the transition of interest are eliminated and specific transitions can be precisely selected. Hence, lifetimes of several dozens of excited states can be determined from a single experiment, using that the emission-angle dependent Doppler-shift of the deexciting γ-ray energy is linked to the attenuation time of the recoiling nucleus. Systematic studies were performed along isotopic chains [4-6], including Zr, Ru, Sn, and Te. Recent results obtained via the DSA method and by spectroscopy benefitting from coincidence measurements will be presented.
Supported by the DFG (ZI-510/9-1).
[1] A. Hennig et al., NIM A 794 (2015) 171
[2] M. Spieker et al., Phys. Rev. C 97 (2018) 054319
[3] S. G. Pickstone et al., NIM A 875 (2017) 104
[4] S. Prill et al., Phys. Rev. C 105 (2022) 034319
[5] A. Hennig et al., Phys. Rev. C 92 (2015) 064317
[6] S. Prill et al., Phys. Conf. Ser. 1643 (2020) 012157