Constraining UHECR source parameters assuming a cosmogenic origin of KM3-230213A
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September 23, 2025
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Abstract
Various models were proposed to explain the observed spectrum and composition of ultra-high-energy cosmic rays (UHECRs), but they remain inconclusive in constraining their source of origin. A significant neutrino event with an estimated energy between 72 PeV and 2.6 EeV was recently observed by the KM3NeT experiment (KM3-230213A). When interpreted as cosmogenic in origin, this event can provide constraints on several phenomenological parameters of UHECR sources. In this contribution, we aim to constrain a two-population model of UHECRs using the cosmic-ray data of the Pierre Auger Observatory and multi-messenger constraints. The first population is mixed in composition, while the second population is comprised of ultra-high-energy (UHE) protons with a higher maximum rigidity. We present the best-fit solution to the spectrum and composition of UHECRs that is consistent with the detection of a single neutrino event by the KM3NeT detector at the energy range of KM3-230213A.
DOI: https://doi.org/10.22323/1.501.0172
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Copyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
Copyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.