Gießen 2024 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 2: Nuclear Astrophysics I
HK 2.5: Talk
Monday, March 11, 2024, 18:00–18:15, HBR 14: HS 4
Geant4 Monte Carlo Simulation of the 12C(α,α′) reaction — •Timo Biesenbach1, David Werner1, Peter Reiter1, Konrad Arnswald1, Maximilian Droste1, Pavel Golubev2, Rouven Hirsch1, Hannah Kleis1, Nikolas Königstein1, Dirk Rudolph2, Alessandro Salice1, Joe Roob1, Madalina Ravar1,3, 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 of the three-particle decay of the Hoyle state in 12C provide a crucial probe for the inner structure of 12C and they are very relevant for the topic of stellar nucleosynthesis. To study the decay modes, a 12C(α,α′) reaction at 27 MeV beam energy was performed at the 10 MV FN-tandem accelerator at the Institute for Nuclear Physics of the University of Cologne using the Lund-York-Cologne-Calorimeter. The reaction and experimental setup were rebuilt using the Geant4 simulation-framework. Detailed Monte-Carlo simulations of the experiment were performed to determine the setup’s sensitivity and detection efficiency for the scattered α and the three decay α’s. The impact of the data analysis on the identification of the sequential and direct decay modes of the Hoyle state but also states at higher excitation energy is scrutinized in detail by comparing simulated with experimentally obtained data. The preliminary results include Dalitz plots and sensitivity limits for the identification of the individual α decay branches.
Keywords: Hoyle State; Monte Carlo Simulation