Köln 2025 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 12: Nuclear Astrophysics II
HK 12.1: Group Report
Monday, March 10, 2025, 16:45–17:15, SR 0.03 Erw. Physik
3α-decay of the 02+ state in 12C — •David Werner1, Timo Biesenbach1, Joe Roob1, Alessandro Salice1, Peter Reiter1, Maximilian Droste1, Madalina Enciu3, Pavel Golubev2, Hannah Kleis1, Nikolas Königstein1, Dirk Rudolph2, 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 decays of the 02+ excited state in 12C, known as the Hoyle state, serve as key probes for the internal structure of 12C and provide critical insights into stellar nucleosynthesis. To populate excited states in 12C, especially the Hoyle state, a 12C(α, α′) reaction at a beam energy of 27 MeV was utilized in two high statistics-experiments at the 10 MV FN Tandem Accelerator at the University of Cologne. The decay products were detected using the Lund-York-Cologne-Calorimeter (LYCCA), which at the time featured 18 segmented double-sided silicon strip detectors, providing a high angular resolution and individual detection of up to four of the reaction’s α particles. The data analysis is based on classical kinematic analysis methods as well as machine learning techniques to differentiate between the different decay modes. Results of the study, including the momentum distributions of the decay products and branching ratios of the different decay modes, will be presented.
Keywords: Stellar Nucleosynthesis; Hoyle State; 12C; Particle spectroscopy; LYCCA