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Mainz 2022 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 54: Nuclear Astrophysics III

HK 54.4: Talk

Wednesday, March 30, 2022, 17:00–17:15, HK-H10

Analysis of the 3α-decay of the 02+ state in 12C — •David Werner1, Madalina Ravar1,3, Peter Reiter1, Konrad Arnswald1, Maximilian Droste1, Pavel Golubev2, Rouven Hirsch1, Hannah Kleis1, Nikolas Königstein1, Dirk Rudolph2, Alessandro Salice1, and Luis Sarmiento21University of Cologne, Institute for Nuclear Physics, Cologne — 2Lund University, Department of Physics, Lund, Sweden — 3TU Darmstadt, Institute of Nuclear Physics, Darmstadt

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

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