# Sensitivity of top-of-the-mountain fluorescence telescope system for astrophysical neutrino flux above 10 PeV

## TL;DR

This paper evaluates a mountain-top fluorescence telescope system's ability to detect ultra-high-energy astrophysical neutrinos above 10 PeV, showing it can complement IceCube and potentially discover cosmogenic neutrinos.

## Contribution

It introduces a novel mountain-top fluorescence telescope setup for detecting neutrinos above 10 PeV, extending neutrino astronomy into higher energies.

## Key findings

- System can detect ~10 events per year above 10 PeV.
- Sensitivity comparable to IceCube Gen II in adjacent energy ranges.
- Capable of discovering cosmogenic neutrino signals.

## Abstract

Tau neutrinos with energies in the PeV-EeV range produce up-going extensive air showers (UEAS) if they interact underground close enough to the surface of the Earth. This work studies detectability of the UEAS with a system of fluorescence telescopes overlooking dark, low reflectivity, area on the ground up to the distances 20-30 km from mountain top(s). Such system could provide sensitivity sufficient for accumulation of the astrophysical neutrino signal statistics at the rate ten(s) events per year in the energy range beyond 10 PeV, thus allowing to extend the energy frontier of neutrino astronomy into 10-100 PeV range. Comparison of sensitivities of the top-of-the-mountain telescope and IceCube Generation II shows that the two approaches for neutrino detection are complementary, providing comparable performance in adjacent energy bands below and above 10 PeV. Sensitivity of the top-of-the-mountain fluorescence telescope system is also sufficient for the discovery of theoretically predicted cosmogenic neutrino signal.