Köln 2025 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 12: Nuclear Astrophysics II
HK 12.3: Talk
Monday, March 10, 2025, 17:30–17:45, SR 0.03 Erw. Physik
Assessing the role of composition in the collapse of massive stars — •Justin Schäfer1,2, Gabriel Martínez-Pinedo1,2, and Ante Ravlić3 — 1GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt — 2Institut für Kernphysik (Theoriezentrum), TU Darmstadt — 3Facility for Rare Isotope Beams, Michigan State University
The collapse of massive stars after iron core formation is determined by electron captures on a broad range of nuclei. To understand this, a description of electron captures and accurate determination of the composition is crucial. In this work we aim to explore the impact of compositional changes on the deleptonization rate. We show that different treatments of partition functions, which govern the distribution of nuclear states at given temperatures and densities, influence the individual composition substantially. However, the deleptonization rate and therefore the evolution of the collapsing star is rather unaffected by the detailed composition of matter. This behavior provides insight into the nuclear physics relevant for core-collapse supernovae modeling. This work is supported by the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme (ERC Advanced Grant KILONOVA No.885281) and the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) - Project-ID 279384907 - SFB 1245, and MA 4248/3-1.
Keywords: Core-collapse supernovae; Electron capture rates