The Electron-Gamma Coincidence Setup DAGOBERT

2025/06/02 by Hesbacher, B., Steinhilber, G., Isaak, J. +9 · 2 citations
#FOS: Physical sciences #Instrumentation and Detectors (physics.ins-det) #Nuclear Experiment (nucl-ex)

paper · doi:10.48550/arxiv.2506.02072

Abstract

The QCLAM electron spectrometer at the S-DALINAC electron accelerator at Technische Universität Darmstadt has been extended by the DAGOBERT γ-detector array consisting of fast timing and high efficiency LaBr₃:Ce detectors to perform electron-gamma coincidence measurements. The functionality of the setup and data acquisition system was demonstrated in a commissioning measurement on ¹²\textrmC observing the 4.44 MeV and 15.11 MeV states. A medium-heavy nucleus, ⁹⁶\textrmRu, has been studied for the first time up to excitation energies of 15 MeV using the (e,e'γ) reaction. In particular, the angular distribution of the 2₁⁺ state and the γ-decay branching ratios of the mixed-symmetric 2₃⁺ state were observed. DAGOBERT@QCLAM is a new and worldwide unique setup for nuclear structure studies of excitation and decay using purely electromagnetic probes, with a significantly improved sensitivity compared to previous experiments.

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