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Constraints on the Diffuse Flux of Ultra-High Energy Neutrinos from Four Years of Askaryan Radio Array Data in Two Stations

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arxiv 1912.00987 v2 pith:NJIEZXFO submitted 2019-12-02 astro-ph.HE astro-ph.IM

classification astro-ph.HEastro-ph.IM
keywords neutrinosdiffuseenergyfluxfourradiotextrmultra-high
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abstract

The Askaryan Radio Array (ARA) is an ultra-high energy (UHE, $>10^{17}$ eV) neutrino detector designed to observe neutrinos by searching for the radio waves emitted by the relativistic products of neutrino-nucleon interactions in Antarctic ice. In this paper, we present constraints on the diffuse flux of ultra-high energy neutrinos between $10^{16}-10^{21}$ eV resulting from a search for neutrinos in two complementary analyses, both analyzing four years of data (2013-2016) from the two deep stations (A2, A3) operating at that time. We place a 90 % CL upper limit on the diffuse all flavor neutrino flux at $10^{18}$ eV of $EF(E)=5.6\times10^{-16}$ $\textrm{cm}^{-2}$$\textrm{s}^{-1}$$\textrm{sr}^{-1}$. This analysis includes four times the exposure of the previous ARA result, and represents approximately 1/5 the exposure expected from operating ARA until the end of 2022.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Instrument design and performance of the first seven stations of RNO-G

    astro-ph.IM 2024-11 conditional novelty 6.0 of 10

    The first seven RNO-G stations are commissioned and performing to design expectations, with 10-20 ps timing resolution and trigger thresholds near design targets.

  2. Long-baseline horizontal radio-frequency transmission through polar ice

    astro-ph.IM 2019-08 conditional novelty 6.0 of 10

    Horizontal radio transmissions through 1 to 5 km of South Polar ice yield an attenuation length near 1.5 km and a polarization-dependent arrival-time asymmetry of about 8 to 9 ns per km.

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