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.
Highlights
Background rejectionA few tens of cosmogenic neutrinos per year are expected in Giant Radio Array for Neutrino Detection (GRAND)
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
We present here a preliminary evaluation of the potential of GRAND for the detection of cosmic neutrinos, based on the simulated response of a 90 000 antennas setup deployed on a square layout of 60 000 km2 in a remote mountainous area, the Tianshan mountains in the XinJiang province, China
Summary
Cosmic ντ can produce taus under the Earth surface through charged-current interactions. GRAND antennas are foreseen to operate in the 30−100 MHz band This range, short-wave background prevents detection, while coherence of radio emission fades above it. An extension of the antenna response up to 200 or 300 MHz would enable us to better observe the Cherenkov ring associated with the air shower [6], which represents a sizable fraction of the total electromagnetic signal at these frequencies. This could provide an unambiguous signature for background rejection
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