2024/09/03 by Maximilian Meier, Meier, Maximilian · 2 citations
Physics and Astronomy · #Astrophysics and Cosmic Phenomena #FOS: Physical sciences #High Energy Astrophysical Phenomena (astro-ph.HE)
paper · pdf · doi:10.48550/arxiv.2409.01740
openalex publication_date 2024/09/03 · openalex created_date 2024/09/29 · openalex updated_date 2026/07/28
Neutrinos with energies beyond PeV (extremely high energy, EHE) are produced\nin interaction of the highest energy cosmic rays. One contribution to the EHE\nneutrino flux is expected to arise from so-called cosmogenic neutrinos\ngenerated in ultra high energy cosmic ray interactions with cosmic microwave\nbackground photons. Observation of cosmogenic neutrinos can probe the nature of\ncosmic rays beyond the energies for resonant photo-pion production (GZK\ncutoff). The IceCube detector instruments a cubic kilometer of the South Pole\nice to detect Cherenkov light emitted by charged particles produced in neutrino\ninteractions. In the future IceCube-Gen2 will increase the effective detection\nvolume for EHE neutrinos by adding radio antennas to the in-ice detector. In\nthis contribution we present new constraints on the EHE neutrino flux above 5\n\× 106 GeV using 12.6 years of IceCube data. The differential upper limit\nconstrains the all-flavor EHE neutrino flux at 1 EeV to below a level of E2\n\Φ \∼ 10-8 , \GeV , \cm-2 , \s-1 ,\n\sr-1. Additionally, we also describe the projected sensitivity of\nthe IceCube-Gen2 radio array, which will reach fluxes about 1.5 orders of\nmagnitude smaller than the current limits at 1 EeV.\n