Speaker
Description
The radio-frequency emissions produced by particle showers on Earth, resulting from cosmic rays (CRs) and neutrinos originating from highly energetic sources, share significant similarities, enabling radio detectors initially designed for ultra-high energy neutrino (UHE-$\nu$) searches to also study CRs. The Askaryan Radio Array (ARA), an experiment currently operating within the ice at the South Pole, is primarily designed to detect UHE-$\nu$s. To date, ARA has deployed five stations, with each station equipped with antennas installed up to a depth of 200 meters in the ice.
Data recorded by ARA Station-2 (A2) suggests a potential CR origin for a subset of events identified in a UHE-$\nu$ search, including a double-pulse event potentially from a downward propagating CR-induced air shower, with geomagnetic followed by Askaryan emission producing the two pulses. A detailed investigation of this CR candidate event using comprehensive simulations is underway to accurately determine the origin of the event, with the goal of identifying the parameters of a CR-induced air shower that best match the experimentally observed quantities. We simulate predicted CR signals in ARA by combining a modern impacting CR shower simulation framework (FAERIE) with a realistic detector simulation (AraSim).
We will present results for an optimization of the event topology, identified through simulated CR showers, comparing the vertex reconstruction of both the geomagnetic and Askaryan signals of the event, as well as the observed time delays between the two signals in each channel.
| Collaboration(s) | ARA |
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