# The Giant Radio Array for Neutrino Detection

## TL;DR

GRAND is a large-scale radio antenna array designed to detect high-energy neutrinos, cosmic rays, and fast radio bursts, aiming to improve sensitivity to cosmogenic neutrinos and observe rare astrophysical events.

## Contribution

This paper introduces the preliminary design of GRAND, a massive radio array for neutrino detection, detailing how it will achieve its sensitivity goals and outlining future development steps.

## Key findings

- Design feasibility of GRAND array demonstrated
- Expected detection of ~50 neutrino events per year
- Potential to detect UHECRs and FRBs

## Abstract

The Giant Radio Array for Neutrino Detection (GRAND) is a planned array of ~200 000 radio antennas deployed over ~200 000 km2 in a mountainous site. It aims primarly at detecting high-energy neutrinos via the observation of extensive air showers induced by the decay in the atmosphere of taus produced by the interaction of cosmic neutrinos under the Earth surface. GRAND aims at reaching a neutrino sensitivity of 5.10$^{11}$ E$^{-2}$ GeV$^{-1}$cm$^{-2}$s$^{-1}$sr$^{-1}$ above 3.10$^{16}$ eV. This ensures the detection of cosmogenic neutrinos in the most pessimistic source models, and ~50 events per year are expected for the standard models. The instrument will also detect UHECRs and possibly FRBs. Here we show how our preliminary design should enable us to reach our sensitivity goals, and discuss the steps to be taken to achieve GRAND.