| Literature DB >> 18352170 |
R U Abbasi1, 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.
Abstract
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.Entities:
Year: 2008 PMID： 18352170 DOI： 10.1103/PhysRevLett.100.101101
Source DB: PubMed Journal: Phys Rev Lett ISSN： 0031-9007 Impact factor: 9.161