First observation of the Greisen-Zatsepin-Kuzmin suppression.

نویسندگان

  • R U Abbasi
  • T Abu-Zayyad
  • M Allen
  • J F Amman
  • G Archbold
  • K Belov
  • J W Belz
  • S Y Ben Zvi
  • D R Bergman
  • S A Blake
  • O A Brusova
  • G W Burt
  • C Cannon
  • Z Cao
  • B C Connolly
  • W Deng
  • Y Fedorova
  • C B Finley
  • R C Gray
  • W F Hanlon
  • C M Hoffman
  • M H Holzscheiter
  • G Hughes
  • P Hüntemeyer
  • B F Jones
  • C C H Jui
  • K Kim
  • M A Kirn
  • E C Loh
  • M M Maestas
  • N Manago
  • L J Marek
  • K Martens
  • J A J Matthews
  • J N Matthews
  • S A Moore
  • A O'Neill
  • C A Painter
  • L Perera
  • K Reil
  • R Riehle
  • M Roberts
  • D Rodriguez
  • N Sasaki
  • S R Schnetzer
  • L M Scott
  • G Sinnis
  • J D Smith
  • P Sokolsky
  • C Song
  • R W Springer
  • B T Stokes
  • S B Thomas
  • J R Thomas
  • G B Thomson
  • D Tupa
  • S Westerhoff
  • L R Wiencke
  • X Zhang
  • A Zech
چکیده

The High Resolution Fly's Eye (HiRes) experiment has observed the Greisen-Zatsepin-Kuzmin suppression (called the GZK cutoff) with a statistical significance of five standard deviations. HiRes' measurement of the flux of ultrahigh energy cosmic rays shows a sharp suppression at an energy of 6 x 10(19) eV, consistent with the expected cutoff energy. We observe the ankle of the cosmic-ray energy spectrum as well, at an energy of 4 x 10(18) eV. We describe the experiment, data collection, and analysis and estimate the systematic uncertainties. The results are presented and the calculation of the statistical significance of our observation is described.

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عنوان ژورنال:
  • Physical review letters

دوره 100 10  شماره 

صفحات  -

تاریخ انتشار 2008