Kavli Affiliate: Cosmin Deaconu
| First 5 Authors: Stephanie Wissel, Andrew Zeolla, Cosmin Deaconu, Valentin Decoene, Kaeli Hughes
| Summary:
Neutrinos at ultrahigh energies can originate both from interactions of
cosmic rays at their acceleration sites and through cosmic-ray interactions as
they propagate through the universe. These neutrinos are expected to have a low
flux which drives the need for instruments with large effective areas. Radio
observations of the inclined air showers induced by tau neutrino interactions
in rock can achieve this, because radio waves can propagate essentially
unattenuated through the hundreds of kilometers of atmosphere. Proposed arrays
for radio detection of tau neutrinos focus on either arrays of inexpensive
receivers distributed over a large area, the GRAND concept, or compact phased
arrays on elevated mountains, the BEACON concept, to build up a large detector
area with a low trigger threshold. We present a concept that combines the
advantages of these two approaches with a trigger driven by phased arrays at a
moderate altitude (1 km) and sparse, high-gain outrigger receivers for
reconstruction and background rejection. We show that this design has enhanced
sensitivity at 100 PeV over the two prior designs with fewer required antennas
and discuss the need for optimized antenna designs.
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