Köln 2025 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 45: Nuclear Astrophysics VI
HK 45.5: Vortrag
Donnerstag, 13. März 2025, 15:00–15:15, SR 0.03 Erw. Physik
Astrophysical and Nuclear Uncertainties of the r-Process — •Jan Kuske1, Almudena Arcones1,2,3, Takayuki Miyagi4, Moritz Reichert5, and Achim Schwenk1,3 — 1IKP, TU Darmstadt (DEU) — 2GSI, Darmstadt (DEU) — 3MPIK, Heidelberg (DEU) — 4CCS, U. Tsukuba (JPN) — 5Dep. Astronomia i Astrofisica, U. Valencia (ESP)
The rapid neutron capture (r-) process produced half of the elements heavier than iron in the Universe. Significant uncertainties remain in understanding the astrophysical environments capable of generating the necessary intense neutron fluxes. Detailed simulations of proposed astrophysical scenarios (e.g. binary neutron star mergers, magneto-hydrodynamical supernovae, and collapsars) are computationally intensive and subject to various uncertainties.
To address these challenges, we adopt an alternative approach that is instead based on a site-independent density profile. Our nuclear network calculations explore a wide range of initial electron fractions, entropies, and expansion timescales. The results align well with those of simulations and extend beyond conditions currently found in them.
Another important source of uncertainties arises from poorly constrained nuclear properties: Most nuclei along the r-process path are currently not experimentally accessible, making theoretical predictions essential, e.g. for nuclear masses, reaction rates, and fission properties. Here we show the impact of nuclear masses on r-process predictions and compare the results to observational data.
Keywords: r-process; nuclear masses