A search for extremely-high-energy neutrinos and first constraints on the ultra-high-energy cosmic-ray proton fraction with IceCube - INSPIRE

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A search for extremely-high-energy neutrinos and first constraints on the ultra-high-energy cosmic-ray proton fraction with IceCube

IceCube

Collaboration

Feb 3, 2025

12 pages

e-Print:

2502.01963 [astro-ph.HE]

Experiments:

ICECUBE

View in:

ADS Abstract Service

reference search7 citations

Citations per year

Abstract: (arXiv)

We present a search for the diffuse extremely-high-energy neutrino flux using

12.6

years of IceCube data. The non-observation of neutrinos with energies well above

10 \, \mathrm{PeV}

constrains the all-flavor neutrino flux at

10^{18} \, \mathrm{eV}

to a level of

E^2 \Phi_{\nu_e + \nu_\mu + \nu_\tau} \simeq 10^{-8} \, \mathrm{GeV} \, \mathrm{cm}^{-2} \, \mathrm{s}^{-1} \, \mathrm{sr}^{-1}

, the most stringent limit to date. Using this data, we constrain the proton fraction of ultra-high-energy cosmic rays (UHECRs) above

\simeq 30 \, \mathrm{EeV}

to be

\lesssim 70\,

% (at

90\,

% CL) if the cosmological evolution of the sources is comparable to or stronger than the star formation rate. This result complements direct air-shower measurements by being insensitive to uncertainties associated with hadronic interaction models. It is the first such result to disfavor the ``proton-only" hypothesis for UHECRs using neutrino data.

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