First observation of the Greisen-Zatsepin-Kuzmin suppression

First observation of the Greisen-Zatsepin-Kuzmin suppression

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 o...

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Veröffentlicht in:Physical review letters 2008-03, Vol.100 (10), p.101101-101101, Article 101101
Hauptverfasser: Abbasi, R U, Abu-Zayyad, T, Allen, M, Amman, J F, Archbold, G, Belov, K, Belz, J W, Ben Zvi, S Y, Bergman, D R, Blake, S A, Brusova, O A, Burt, G W, Cannon, C, Cao, Z, Connolly, B C, Deng, W, Fedorova, Y, Finley, C B, Gray, R C, Hanlon, W F, Hoffman, C M, Holzscheiter, M H, Hughes, G, Hüntemeyer, P, Jones, B F, Jui, C C H, Kim, K, Kirn, M A, Loh, E C, Maestas, M M, Manago, N, Marek, L J, Martens, K, Matthews, J A J, Matthews, J N, Moore, S A, O'Neill, A, Painter, C A, Perera, L, Reil, K, Riehle, R, Roberts, M, Rodriguez, D, Sasaki, N, Schnetzer, S R, Scott, L M, Sinnis, G, Smith, J D, Sokolsky, P, Song, C, Springer, R W, Stokes, B T, Thomas, S B, Thomas, J R, Thomson, G B, Tupa, D, Westerhoff, S, Wiencke, L R, Zhang, X, Zech, A
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Sprache:eng
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Zusammenfassung: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.100.101101