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HK: Fachverband Physik der Hadronen und Kerne

HK 8: Nuclear Astrophysics I

HK 8.5: Vortrag

Montag, 20. März 2023, 17:45–18:00, SCH/A419

Analysis of the 3α-decay of the 0₂⁺ state in ¹²C — •David Werner¹, Joe Roob¹, Peter Reiter¹, Konrad Arnswald¹, Maximilian Droste¹, Pavel Golubev², Rouven Hirsch¹, Hannah Kleis¹, Nikolas Königstein¹, Madalina Ravar^{1, 3}, Dirk Rudolph², Alessandro Salice¹, and Luis Sarmiento² — ¹University of Cologne, Institute for Nuclear Physics, Cologne — ²Lund University, Department of Physics, Lund, Sweden — ³TU Darmstadt, Institute of Nuclear Physics, Darmstadt

The branching ratios between the direct and sequential three-particle decay of the 0₂⁺ excited state in ¹²C, the Hoyle state, are important probes for the inner structure of ¹²C and provide insights into stellar nucleosynthesis. Two high-statistics experiments were performed at the 10 MV FN-tandem accelerator of the Institute for Nuclear Physics of the University of Cologne. A ¹²C(α,α^′) reaction at a beam energy of 27 MeV was utilized to populate the state of interest. The Lund-York-Cologne-Calorimeter (LYCCA) was used to study the three-particle decay branches of the Hoyle state. The 18 segmented double-sided silicon strip detectors allowed individual detection of the reaction’s four α particles with high angular precision. Results from particle spectra are compared with Geant4 Monte-Carlo simulations. Latest analysis results, in particular Dalitz plots and the search for the direct 3α decay, will be presented.