Recent Results from The Askaryan Radio Array

Abstract

The Askaryan Radio Array (ARA) is an ultra-high energy (UHE) neutrino telescope at the South Pole consisting of an array of radio antennas aimed at detecting the Askaryan radiation produced by neutrino interactions in the ice. Currently, the experiment has five stations in operation that have been deployed in stages since 2012. This contribution focuses on the development of a search for a diffuse flux of neutrinos in two ARA stations (A2 and A3) from 2013-2016. A background of $\sim 0.01-0.02$ events is expected in one station in each of two search channels in horizontal- and vertical-polarizations. The expected new constraints on the flux of ultra-high energy neutrinos based on four years of analysis with two stations improve on the previous limits set by ARA by a factor of about two. The projected sensitivity of ARA's five-station dataset is beginning to be competitive with other neutrino telescopes at high energies near $10^{10.5}$GeV.

arXiv comment7 pages, 5 figures, prepared for proceedings for the International Cosmic Ray Conference, Madison, WI, 2019

References in corpus (8)

• The IceCube Neutrino Observatory: Instrumentation and Online Systems
• Observation and Characterization of a Cosmic Muon Neutrino Flux from the Northern Hemisphere using six years of IceCube data
• Cosmogenic Neutrinos: parameter space and detectabilty from PeV to ZeV
• Differential limit on the extremely-high-energy cosmic neutrino flux in the presence of astrophysical background from nine years of IceCube data
• Minimal Cosmogenic Neutrinos
• First Constraints on the Ultra-High Energy Neutrino Flux from a Prototype Station of the Askaryan Radio Array
• Design and Performance of an Interferometric Trigger Array for Radio Detection of High-Energy Neutrinos
• Practical and accurate calculations of Askaryan radiation