Köln 2025 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 22: Nuclear Astrophysics III
HK 22.4: Talk
Tuesday, March 11, 2025, 16:45–17:00, SR 0.03 Erw. Physik
3α decay study of resonances 12C — •Joe Roob1, Peter Reiter1, Konrad Arnswald1, Timo Biesenbach1, Maximilian Droste1, Madalina Enciu3, Pavel Golubev2, Rouven Hirsch1, Hannah Kleis1, Nikolas Königstein1, Dirk Rudolph2, Alessandro Salice1, Luis Sarmiento2, and David Werner1 — 1University of Cologne, Institute for Nuclear Physics, Cologne, Germany — 2Lund University, Department of Physics, Lund, Sweden — 3TU Darmstadt, Institute of Nuclear Physics, Darmstadt, Germany
Excited states in 12C were populated using a 12C(α,α*) reaction during two experiments conducted at the FN tandem in Cologne. Breakup of 12C resonances into three α particles has been measured in complete kinematics with 18 highly segmented Si-strip detectors of the Lund York Cologne Calorimeter Array. Dalitz plots are used to visualize and analyse the data for the particle unbound states 31− at 9.6 MeV, 11− at 10.8 MeV 21− at 11.8 MeV 11+ at 12.7 MeV and 41− at 13.3 MeV states of 12C. The Dalitz plot intensity distribution features zero points characteristic of the total spin and parity of the 3α system. Comparison with previous results from [1] and theoretical predictions will be discussed. [1] O. S. Kirsebom, et al., Phys. Rev. C 81, 064313 (2010)
Keywords: Stellar Nucleosynthesis; Hoyle State; 12C; Cologne; LYCCA