The Giant Radio Array for Neutrino Detection (GRAND) Project

TL;DR

GRAND aims to detect ultra-high-energy cosmic particles, especially neutrinos, using a vast array of radio antennas across multiple sites, potentially enabling groundbreaking neutrino astronomy and particle physics insights.

Contribution

This paper presents the current status and design of the GRAND project, a large-scale radio array for ultra-high-energy neutrino detection, highlighting its potential scientific impact.

Findings

Projected sensitivity enables detection of cosmogenic neutrinos.

Pathfinder GRANDProto300 to start data collection in 2021.

Potential to test particle interactions at energies above accelerators.

Abstract

GRAND is designed to detect ultra-high-energy cosmic particles -- specially neutrinos, cosmic rays and gamma rays using radio antennas. With $\sim$20 mountainous sites around the world it will cover a total area of 200,000 km$^{2}$. The planned sensitivity of 10$^{-10}$ GeV cm$^{-2}$ s$^{-1}$ sr$^{-1}$ above $5\times10^{17}$ eV will likely ensure the detection of cosmogenic neutrinos predicted by most common scenarios enabling neutrino astronomy. Furthermore, PeV--EeV neutrinos can test particle interactions at energies above those achieved in accelerators. The pathfinder stage GRANDProto300 is planned to start taking data in 2021. We present the current overall status of the project with emphasis on the neutrino physics.