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T: Fachverband Teilchenphysik
T 37: Neutrino Astronomy II
T 37.6: Vortrag
Dienstag, 17. März 2026, 17:30–17:45, KS H C
Calculation of the neutrino flavour ratios for astrophysical dense environments — •Tilman Eckstein1,2, Vladimir Kiselev1,2, Jonas Hellrung1,2, and Julia Becker Tjus1,2,3 — 1Theoretical Physics IV, Plasma Astroparticle Physics, Faculty for Physics and Astronomy, Ruhr University Bochum, 44780 Bochum, Germany — 2Ruhr Astroparticle and Plasma Physics Center (RAPP Center), Germany — 3Department of Space, Earth and Environment, Chalmers University of Technology, 412 96 Gothenburg, Sweden
Neutrinos are elementary particles that are characterised in particular by their weak interaction. This allows them to travel enormous distances almost unhindered and still be detected on Earth. Dense astrophysical environments, such as compact obscured nuclei (CONs), are potential sites where high-energy neutrinos may be produced.
In this work, the event generator SIBYLL 2.3d was used to simulate pp collisions under extreme astrophysical conditions, as they might occur in such dense environments. A special feature of the resulting particle showers is that different decay channels lead to characteristically different neutrino flavour compositions. These flavour ratios were calculated using the numerical tool MCEq.
After their creation, neutrinos are subject to the quantum mechanical phenomenon of neutrino oscillation, which causes their flavour composition to change as they propagate over distance. Finally, the numerical tool NuSQuIDS was used to determine the theoretical flavour ratios after propagation from these potential astrophysical source regions to Earth.
Keywords: Neutrino oscillation; SYBILL 2.3d; MCEq; NuSQuIDS