SMuK 2023 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 19: Nuclear Astrophysics II
HK 19.1: Gruppenbericht
Dienstag, 21. März 2023, 17:00–17:30, SCH/A419
Neutrino flavor instability and nucleosynthesis associated with charged-current weak interactions in black hole accretion disks — •Zewei Xiong1, Lucas Johns2, Meng-Ru Wu3, Huaiyu Duan4, Gabriel Martínez-Pinedo1,5, and Oliver Just1 — 1GSI Helmholtzzentrum für Schwerioneneforschung, Darmstadt, Germany — 2UC Berkeley, CA, USA — 3Academia Sinica, Taipei, Taiwan — 4University of New Mexico, Albuquerque, NM, USA — 5Technische Universität Darmstadt, Germany
Charged-current weak interactions destroy the flavor coherence among the weak-interaction states of a single neutrino. In a dense neutrino gas, however, these collision processes can trigger flavor conversion in cooperation with the strong neutrino-neutrino refraction. We show that the collisional flavor instability can exist in black hole accretion disks. As a result, large amounts of heavy-lepton flavor neutrinos can be produced through flavor conversion, which can have important ramifications in the subsequent evolution of the remnant.
In addition to the charged-current neutrino interactions with nucleons, the neutrino-nucleus interactions can possess larger cross sections in neutron-rich nuclei and affects the r-process nucleosynthesis. We investigate those neutrino-nucleus interactions in black hole accretion disks and show that they can affect electron fraction moderately in specific trajectories with high neutrino fluxes.
Z.X. 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).