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HK: Fachverband Physik der Hadronen und Kerne

HK 53: Structure and Dynamics of Nuclei XI

HK 53.2: Talk

Wednesday, March 13, 2024, 18:00–18:15, HBR 19: C 5b

Sub-picosecond lifetimes of excited states in ^116,118Sn — •Sarah Prill, Anna Bohn, and Andreas Zilges — University of Cologne, Institute for Nuclear Physics, Germany

In recent years, lifetimes of excited states of various nuclei in the mass region A=100 and above have been determined with the well established coincidence Doppler-shift attenuation method (CDSAM) in Cologne [1,2]. Following the study of ^112,114Sn [3], four experiments were performed on ^116,118Sn to determine sub-picosecond lifetimes. Inelastic scattering experiments with both alpha particles and protons were employed. The resulting coincidence data was recorded with the SONIC@HORUS detector array [4] at the University of Cologne. Herein, the emitted Doppler-shifted photons were detected in HORUS in coincidence with the back-scattered beam particles, recorded by SONIC. From these coincidences, the reaction kinematics can be reconstructed. Single levels can be targeted directly in the analysis via energy constraints which enables feeding exclusion. Numerous level lifetimes in ^116,118Sn were determined with the CDSA method and the results will be presented in this contribution.

Supported by the DFG (ZI 510/9-2).

[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).

Keywords: Sn; tin; lifetime measurements; CDSAM