Mainz 2022 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 61: Structure and Dynamics of Nuclei X

HK 61.5: Talk

Thursday, March 31, 2022, 15:15–15:30, HK-H6

Extension of the level scheme of ¹⁰⁴Ru and lifetime determination using the Doppler-shift attenuation method — •Anna Bohn, Christina Deke, Felix Heim, Sarah Prill, Michael Weinert, and Andreas Zilges — University of Cologne, Institute for Nuclear Physics, 50937 Cologne, Germany

The (p,p’γ) Doppler-shift attenuation method (DSAM) is a powerful tool to determine nuclear level lifetimes in the sub-picosecond range and was well established at the Institute for Nuclear Physics at the University of Cologne in recent years [1,2]. The combined particle-γ detector array SONIC@HORUS [3] enables the measurement of p-γ and p-γ-γ coincidences. Hence, knowledge of the complete reaction kinematics is provided and feeding contributions from energetically higher lying states can be eliminated.
In this contribution, results from a ¹⁰⁴Ru(p,p’γ) DSAM experiment will be presented. More than two dozen nuclear level lifetimes as well as over 50 previously unknown levels and decay transitions could be identified via the analysis of p-γ-γ coincidence data.
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