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27 April 2024

» arxiv » 2008.05690

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Ultra-high Energy Air Showers Observed by ANITA-IV
ANITA Collaboration ; P. W. Gorham ; A. Ludwig ; C. Deaconu ; P. Cao ; P. Allison ; O. Banerjee ; L. Batten ; D. Bhattacharya ; J. J. Beatty ; K. Belov ; W. R. Binns ; V. Bugaev ; C. H. Chen ; P. Chen ; Y. Chen ; J. M. Clem ; A. Connolly ; L. Cremonesi ; B. Dailey ; P. F. Dowkontt ; B. D. Fox ; J. W. H. Gordon ; C. Hast ; B. Hill ; S. Y. Hsu ; J. J. Huang ; K. Hughes ; R. Hupe ; M. H. Israel ; T.C. Liu ; L. Macchiarulo ; S. Matsuno ; K. McBride ; C. Miki ; J. Nam ; C. J. Naudet ; R. J. Nichol ; A. Novikov ; E. Oberla ; M. Olmedo ; R. Prechelt ; S. Prohira ; B. F. Rauch ; J. M. Roberts ; A. Romero-Wolf ; B. Rotter ; J. W. Russell ; D. Saltzberg ; D. Seckel ; H. Schoorlemmer ; J. Shiao ; S. Stafford ; J. Stockham ; M. Stockham ; B. Strutt ; M. S. Sutherland ; G. S. Varner ; A. G. Vieregg ; S. H. Wang ; S. A. Wissel ;
Date:	13 Aug 2020
Abstract:	ANITA’s fourth long-duration balloon flight in late 2016 detected 29 cosmic-ray (CR)-like events on a background of $0.37^{+0.27}_{-0.17}$ anthropogenic events. CRs are mainly seen in reflection off the Antarctic ice sheets, creating a characteristic phase-inverted waveform polarity. However, four of the below-horizon CR-like events show anomalous non-inverted polarity, a $sim 3.2sigma$ fluctuation if due to background. All anomalous events are from locations near the horizon; ANITA-IV observed no steeply-upcoming anomalous events similar to the two such events seen in prior flights.
Source:	arXiv, 2008.05690
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