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HK: Fachverband Physik der Hadronen und Kerne

HK 22: Nuclear Astrophysics III

HK 22.4: Vortrag

Dienstag, 11. März 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