SMuK 2023 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 69: Structure and Dynamics of Nuclei XIV
HK 69.4: Vortrag
Donnerstag, 23. März 2023, 16:30–16:45, SCH/A118
Lifetime measurements in 116,118Sn — •Sarah Prill, Anna Bohn, Felix Heim, Michael Weinert, and Andreas Zilges — University of Cologne, Institute for Nuclear Physics
The Doppler-shift attenuation method (DSAM) using particle-γ coincidences is a reliable technique to determine sub-picosecond lifetimes of excited nuclear levels without feeding contributions [1,2]. In recent years, it was used to determine level lifetimes of stable nuclei along isotopic chains around the Z=50 and N=50 and N=82 shell closures to study changes of nuclear structure phenomena along these chains.
For 112,114Sn, lifetimes have already been determined with this method [3]. To continue the study across the semi-magic tin isotopic chain, inelastic proton and alpha particle scattering experiments have been performed on 116Sn and 118Sn at the SONIC@HORUS detector array [4] at the University of Cologne. The combined detector array can measure the backscattered projectiles in coincidence with the produced γ radiation. This enables the reconstruction of the reaction kinematics as well as the elimination of feeding by selecting the direct excitation of the level of interest from the particle energy.
From these experiments, numerous level lifetimes in 116,118Sn could be determined.
Supported by the DFG (ZI 510/9-1).
[1] A. Hennig et al., Nucl. Instr. Meth. A 758, 171 (2015).
[2] S. Prill et al., Phys. Rev. C 105, 034319 (2022).
[3] M. Spieker et al., Phys. Rev. C 97, 054319 (2018).
[4] S. G. Pickstone et al., Nucl. Instr. Meth. A 875, 104 (2017).