Determining the fraction of cosmic-ray protons at ultrahigh energies with cosmogenic neutrinos

Cosmogenic neutrinos are produced when ultrahigh-energy cosmic rays (UHECRs) interact with cosmological photon fields. Limits on the diffuse flux of these neutrinos can be used to constrain the fraction of protons arriving at Earth with energies Ep≳30 EeV, thereby providing bounds on the composition of UHECRs without fully relying on hadronic interaction models. We show to which extent current neutrino telescopes already constrain this fraction of protons and discuss the prospects for next-generation detectors to further constrain it. Additionally, we discuss the implications of these limits for several popular candidates for UHECR source classes.

Note:

5 pages, 2 figures, 1 table; Published in PRD, updated to match published version

cosmic radiation: UHE
cosmic radiation: primary
p: cosmic radiation
neutrino: detector
neutrino: current
interaction: model
gamma ray: burst
AGN
Auger
IceCube

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Figures(2)

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