Köln 2025 – scientific programme

Parts | Days | Selection | Search | Updates | Downloads | Help

HK: Fachverband Physik der Hadronen und Kerne

HK 23: Poster

HK 23.5: Poster

Tuesday, March 11, 2025, 17:30–19:00, Foyer Physik

Lifetime measurements of ⁹⁸Ru using the Reverse Coincidence Doppler-Shift Attenuation Method — •Tobias Langel, Elias Binger, Anna Bohn, Sarah Prill, Michael Weinert, and Andreas Zilges — University of Cologne, Institute for Nuclear Physics, Germany

The Coincidence Doppler-Shift Attenuation Method (CDSAM) has been successfully used for many years at the University of Cologne to determine lifetimes of excited states in the sub-picosecond regime [1,2]. Inelastic scattering experiments are performed, where both the scattered projectile and the Doppler-shifted photon(s) are detected in coincidence at the SONIC@HORUS detector array [3] in Cologne. Due to the nature of coincident detection, a higher degree of background reduction as well as feeding exclusion can be achieved.
To improve this method for weak transitions, the new Reverse CDSAM approach has been developed in recent years. Among several other A≈100 isotopes, a (p,p^′γ) experiment was performed on ⁹⁸Ru to determine a variety of lifetimes using both approaches of the CDSA Method. This contribution presents the experimental results and compares the two analysis approaches.
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] S. G. Pickstone et al., Nucl. Instr. Meth. A 875, 104 (2017).

Keywords: Reverse CDSAM; lifetime measurements; Ru