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Communication Dans Un Congrès Année : 2017

The Giant Radio Array for Neutrino Detection

Résumé

The Giant Radio Array for Neutrino Detection (GRAND) is a planned array of ∼ 2·10 5 radio antennas deployed over ∼ 200 000 km 2 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 tau 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, while the compelling science case for GRAND is discussed in more details in 1. 1 Detection Method Cosmic ν τ can produce taus a under the Earth surface through charged-current interactions. Taus may then exit and decay in the atmosphere, generating Earth- skimming extensive air showers (EAS) 2,3. EAS emit coherent electromagnetic radiations at frequencies of a few to hundreds of MHz, detectable by radio antennas for shower energies E > 3 · 10 16 eV 4,5. The strong beaming of the electromagnetic emission, combined with the transparency of the atmosphere to radio waves, will allow the radiodetection of EAS initiated by tau decays at distances up to several tens of kilometers (see 1), making radio antennas ideal instruments for the search of cosmic neutrinos. Furthermore, antennas offer practical advantages (e.g. limited unit cost, easiness of deployment) that allow the deployment of an array over very large areas, as required by the expected low neutrino event rate. Remote sites, with low electromagnetic background, should obviously be considered for the array location. In addition, mountain ranges are preferred, first because they offer an additional target for the neutrinos, and also because mountain slopes are better suited to the detection of Earth-skimming showers compared to flat areas which are parallel to the neutrino-induced EAS trajectories. a Other neutrino flavors can be neglected, as the electron range in matter at these energies is too short and the muon decay length too large.
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Dates et versions

hal-01758559 , version 1 (04-04-2018)

Identifiants

  • HAL Id : hal-01758559 , version 1
  • INSPIRE : 1663859

Citer

O. Martineau-Huynh. The Giant Radio Array for Neutrino Detection. 52nd Rencontres de Moriond on Very High Energy Phenomena in the Universe, Mar 2017, La Thuile, Italy. pp.9-13. ⟨hal-01758559⟩
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