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Phys. Rev. Lett. 103, 051103 (2009) [5 pages]

New Limits on the Ultrahigh Energy Cosmic Neutrino Flux from the ANITA Experiment

P. W. Gorham,1 P. Allison,1 S. W. Barwick,2 J. J. Beatty,3 D. Z. Besson,4 W. R. Binns,5 C. Chen,12 P. Chen,6 J. M. Clem,7 A. Connolly,11 P. F. Dowkontt,5 M. A. DuVernois,9 R. C. Field,6 D. Goldstein,2 A. Goodhue,8 C. Hast,6 C. L. Hebert,1 S. Hoover,8 M. H. Israel,5 J. Kowalski,1 J. G. Learned,1 K. M. Liewer,10 J. T. Link,1 E. Lusczek,9 S. Matsuno,1 B. C. Mercurio,3 C. Miki,1 P. Miočinović,1 J. Nam,2,12 C. J. Naudet,10 J. Ng,6 R. J. Nichol,11 K. Palladino,3 K. Reil,6 A. Romero-Wolf,1 M. Rosen,1 L. Ruckman,1 D. Saltzberg,8 D. Seckel,7 G. S. Varner,1 D. Walz,6 Y. Wang,12 and F. Wu12

(ANITA Collaboration)

1Department of Physics and Astronomy, University of Hawaii, Manoa, Hawaii 96822, USA
2Department of Physics, University of California, Irvine California 92697, USA
3Department of Physics, Ohio State University, Columbus, Ohio 43210, USA
4Department of Physics and Astronomy, University of Kansas, Lawrence, Kansas 66045, USA
5Department of Physics, Washington University in St. Louis, Missouri 63130, USA
6Stanford Linear Accelerator Center, Menlo Park, California, 94025, USA
7Department of Physics, University of Delaware, Newark, Delaware 19716, USA
8Department of Physics and Astronomy, University of California, Los Angeles, California 90095, USA
9School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA
10Jet Propulsion Laboratory, Pasadena, California 91109, USA
11Department of Physics, University College London, London, United Kingdom
12Department of Physics, Graduate Institute of Astrophysics, & Leung Center for Cosmology and Particle Astrophysics, National Taiwan University, Taipei, Taiwan

Received 16 December 2008; revised 15 April 2009; published 30 July 2009

We report initial results of the first flight of the Antarctic Impulsive Transient Antenna (ANITA-1) 2006–2007 Long Duration Balloon flight, which searched for evidence of a diffuse flux of cosmic neutrinos above energies of Enu~=3×1018 eV. ANITA-1 flew for 35 days looking for radio impulses due to the Askaryan effect in neutrino-induced electromagnetic showers within the Antarctic ice sheets. We report here on our initial analysis, which was performed as a blind search of the data. No neutrino candidates are seen, with no detected physics background. We set model-independent limits based on this result. Upper limits derived from our analysis rule out the highest cosmogenic neutrino models. In a background horizontal-polarization channel, we also detect six events consistent with radio impulses from ultrahigh energy extensive air showers.

©2009 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevLett.103.051103
DOI: 10.1103/PhysRevLett.103.051103
PACS: 98.70.Sa; 95.55.Vj; 96.50.sd
  • 98.70.Sa
    Cosmic rays
  • 95.55.Vj
    Neutrino, muon, pion, and other elementary particle detectors; cosmic ray detectors
  • 96.50.sd
    Extensive air showers
  • YEAR: 2009

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