München 2019 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 28: Nuclear Astrophysics II
HK 28.4: Talk
Tuesday, March 19, 2019, 17:30–17:45, HS 16
Influence of astrophysical and nuclear physics uncertainties on the nucleosynthesis in the ν p-process⋆ — •Maximilian Jacobi1, Julia Bliss1, and Almudena Arcones1,2 — 1Institut für Kernphysik, TU Darmstadt, Germany — 2GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany
The spectra of very old stars often show a robust abundance pattern for the elements beyond barium which is associated with the r-process, but exhibit a star-to-star scatter in the abundances of the elements between strontium up to (possibly) silver (the so-called lighter heavy elements).
This scatter can be explained by an additional primary process which might occur in the neutrino-driven wind following a successful core-collapse supernova.
Motivated by recent supernova simulations, we investigate proton-rich neutrino-driven ejecta where the ν p-process can contribute to the production of lighter heavy elements.
We use steady-state neutrino-driven wind trajectories to systematically study the influence of astrophysical uncertainties on the nucleosynthesis evolution in proton-rich conditions and present possible abundance patterns.
In the ν p-process the nucleosynthesis evolves mainly by (p,γ) and (n,p) reactions and variations in the reaction rates of the latter have a critical influence on the final abundance patterns.
We perform a sensitivity study based on a Monte Carlo approach and present a list with key (n,p) reactions for representative astrophysical conditions.
⋆ Supported by the Deutsche Forschungsgemeinschaft through SFB
1245 (Projektnummer 279384907) and the European Research Council
Grant No. 677912 EUROPIUM.