Bonn 2020 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 58: Nuclear Astrophysics II
HK 58.4: Talk
Friday, April 3, 2020, 12:00–12:15, J-HS B
Study of the direct 3-α decay of the 02+ state in 12C with LYCCA — •Madalina Ravar1, David Werner1, Peter Reiter1, Stefan Thiel1, Christoph Goergen1, Konrad Arnswald1, Maximilian Droste1, Herbert Hess1, Rouven Hirsch1, Levent Kaya1, Lars Lewandowski1, Michael Seidlitz1, Kai Wolf1, Dirk Rudolph2, Pavel Golubev2, Luis Sarmiento2, and Patrick Coleman-Smith3 — 1University of Cologne, Institute for Nuclear Physics, Cologne, Germany — 2Lund University, Department of Physics, Lund, Sweden — 3Science and Technology Facilities Council, Daresbury, England
The topic of alpha-decay of the 02+ state in 12C, the so-called “Hoyle State”, gained a lot of interest in the past few years. The mechanism of the 3-α decay and the branching ratio of the direct and the sequential decay have a direct impact on the calculated rates for the triple-alpha process in Helium burning in stars. The Lund-York-Cologne-CAlorimeter (LYCCA), a 24-DSSSDs array, was employed for this kind of measurement at the 10-MV FN-tandem accelerator at the Institute for Nuclear Physics, University of Cologne. The excited state of 12C is obtained via an inelastic alpha scattering on a nat.C target and the outgoing alpha particles are detected in coincidence. LYCCA, a NUSTAR device, planned for FAIR@GSI, is a powerful setup coming with better angular coverage and better detector granularity compared to other measurements performed for the 3-α decay of the Hoyle state until now. Preliminary results from recent beam times are being presented in this talk. Supported by GSI F&E KREITE 1416.