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HK: Fachverband Physik der Hadronen und Kerne
HK 16: Nuclear Astrophysics II
HK 16.6: Vortrag
Dienstag, 17. März 2026, 18:00–18:15, PHIL A 602
Constraining r-process nucleosynthesis with multi-objective Galactic chemical evolution models — •Marta Molero — Institut für Kernphysik, Technische Universität Darmstadt, Schlossgartenstr. 2, Darmstadt 64289, Germany
The astrophysical site(s) of the r-process are uncertain, with candidates such as neutron star mergers and magneto-rotational supernovae predicting different event rates, delay times, and heavy-element yields. Galactic chemical evolution models constrain these properties by comparing model predictions with observed abundances. We explore, in a systematic and data-driven way, the astrophysical conditions under which r-process enrichment can reproduce the observed trends of multiple neutron-capture elements in the Milky Way. Rather than assuming a fixed site, we adopt a flexible, parametric approach to test whether a common set of r-process parameters can explain the chemical evolution of several heavy elements. We compute a grid of one-infall, homogeneous models varying: Eu yield per event, r-process event rate, enrichment delay time, and progenitor mass range. For each of the ∼ 105 models, we predict [X/Fe] vs. [Fe/H] trends by scaling Eu yields with the solar r-process pattern. A multi-objective optimisation based on Pareto fronts identifies models that best reproduce the abundance trends. In this talk, I will present and discuss best fitting Eu models as well as the limitations in reproducing, at the same time, both light and heavy neutron-capture elements, reflecting how the solar r-process scaling relation becomes less robust towards lightest elements.
Keywords: r-process; stellar abundances; Galaxy abundances; Galaxy evolution; ISM abundances