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A search for ultra-high energy neutrinos and cosmic-rays with ANITA-2

Mottram, M.J.; (2012) A search for ultra-high energy neutrinos and cosmic-rays with ANITA-2. Doctoral thesis , UCL (University College London). Green open access

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The ANtarctic Impulsive Transient Antenna (ANITA) experiment is a balloon-borne array of radio antennas designed to search for ultra-high energy neutrinos by observing the Antarctic ice sheet for radio emission that is expected to arise as a result of the neutrinos’ interaction. ANITA is further able to detect radio emission that arises when ultra-high energy cosmic-rays interact in the Earth’s atmosphere. The second flight of the experiment, ANITA-2, took place in 2008-09 over 31 days. This thesis describes an analysis of the ANITA-2 dataset and presents results from searches for ultra-high energy neutrinos and cosmic-rays. No statistical evidence of emission from neutrino interactions is observed, with two candidate events discovered on a background of 1:13 \pm 0:27. A limit on the diffuse flux of ultra-high energy neutrinos is presented, further model-independent and model-dependent flux limits on selected active galactic nuclei are calculated. Four isolated and one non-isolated cosmic-ray candidates are discovered. The identity of the isolated candidates as cosmic-ray-induced radio emission is confirmed through correlation between observed and expected emission polarisation.

Type: Thesis (Doctoral)
Title: A search for ultra-high energy neutrinos and cosmic-rays with ANITA-2
Open access status: An open access version is available from UCL Discovery
Language: English
UCL classification: UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/1344072
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