Erlangen 2026 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 4: Structure and Dynamics of Nuclei I
HK 4.7: Talk
Monday, March 16, 2026, 18:15–18:30, AM 00.011
Lifetime Determination in 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) is a powerful tool to determine nuclear level lifetimes in the sub-picosecond regime [1–2]. At the SONIC@HORUS detector array [3], located at the University of Cologne, both HPGe γ-detectors and silicon particle-detectors are used to enable coincident detection of inelastically scattered protons and subsequently emitted photons. This significantly suppresses background and feeding contributions, allowing for high-precision lifetime measurements.
The newly developed Reverse CDSAM approach [4] improves the accessibility of lower-intensity transitions.
In addition to other experiments conducted in the A≈100 mass region, a 98Ru(p,p′γ) experiment was performed and analyzed using both the standard CDSA method and the new reverse approach.
This contribution presents the experimental results and discusses the differences between the 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)
[4] A. Bohn et al., EPJ Web Conf. 329, 03004 (2025)
Keywords: Reverse CDSAM; Lifetimes; Ru