Köln 2025 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 28: Structure and Dynamics of Nuclei VIII
HK 28.1: Gruppenbericht
Mittwoch, 12. März 2025, 15:45–16:15, HS 2 Physik
Performance of the newly established electron-gamma coincidence facility at the S-DALINAC — •Bastian Hesbacher, Jonny Birkhan, Isabelle Brandherm, Johann Isaak, Igor Jurosevic, Oskar Möller, Norbert Pietralla, Tim Ramaker, Maximilian Rech, and Gerhart Steinhilber — Institut für Kernphysik, Technische Universität Darmstadt
The all-electromagnetic (e,e′γ) reaction had first been used for nuclear structure measurements in the 1980s [1]. Since then very few experiments were based on this reaction. One of the challenges of this measurement technique lies in the coincident bremsstrahlung, which - apart from the angular distribution - cannot be distinguished from the γ-radiation of nuclei decaying to their ground state after excitation by inelastic electron scattering. In 2021 first successful (e,e′γ) measurements were performed at the S-DALINAC with improved resolution of electron energy, gamma energy and coincidence time by two orders of magnitude [2]. The scattered electrons were registered with the QCLAM spectrometer. The γ-radiation was detected by 6 LaBr3:Ce detectors. Measurements on 12C and 96Ru targets were performed and demonstrated the superior performance of the new facility over previous attempts to study (e,e′γ) reactions. Results on the γ-decay behavior and angular distributions of 96Ru will be presented.
This work is funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) - Project-ID 279384907 - SFB 1245
[1] C. N. Papanicolas et al., Phys. Rev. Lett. 54, 26 (1985).
[2] G. Steinhilber, Doctoral thesis, TU Darmstadt (2023).
Keywords: Electron scattering; Coincidence; Ruthenium; Bremsstrahlung; S-DALINAC