Relic Neutrino Background from Cosmic-Ray Reservoirs

We compute the flux of relic neutrino background (R\(\nu\)B) up-scattered by ultra-high-energy (UHE) cosmic rays (CRs) in clusters that act as CR-reservoirs. The long trapping times of UHECRs make this flux larger than that of R\(\nu\)B up-scattered by UHECRs on their way to Earth, which we also com...

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Bibliographic Details
Published in:arXiv.org 2024-05
Main Authors: De Marchi, Andrea Giovanni, Granelli, Alessandro, Nava, Jacopo, Sala, Filippo
Format: Article
Language:English
Subjects:
Clusters
Cosmic rays
Flavors
Inelastic scattering
Momentum transfer
Neutrinos
Reservoirs
Scattering cross sections
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Summary:We compute the flux of relic neutrino background (R\(\nu\)B) up-scattered by ultra-high-energy (UHE) cosmic rays (CRs) in clusters that act as CR-reservoirs. The long trapping times of UHECRs make this flux larger than that of R\(\nu\)B up-scattered by UHECRs on their way to Earth, which we also compute. We find that IceCube excludes R\(\nu\)B weighted overdensities larger than \(10^{10}\) in clusters, and that PUEO, RNO-G, GRAND and IceCube-Gen2 will test values down to \(10^{8}\). Our treatment incorporates the momentum transfer dependence of the neutrino-nucleus cross section, deep inelastic scattering, a mixed UHECR composition, and flavour information on the up-scattered R\(\nu\)B fluxes for both cases of neutrino mass spectrum with normal and inverted ordering, providing new handles to possibly disentangle the up-scattered R\(\nu\)B from cosmogenic neutrinos.
ISSN:2331-8422