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Abbasi RU, Abu-Zayyad T, Allen M, Amman JF, Archbold G, Belov K, Belz JW, Ben Zvi SY, Bergman DR, Blake SA, Brusova OA, Burt GW, Cannon C, Cao Z, Connolly BC, Deng W, Fedorova Y, Finley CB, Gray RC, Hanlon WF, Hoffman CM, Holzscheiter MH, Hughes G, Hüntemeyer P, Jones BF, Jui CCH, Kim K, Kirn MA, Loh EC, Maestas MM, Manago N, Marek LJ, Martens K, Matthews JAJ, Matthews JN, Moore SA, O'Neill A, Painter CA, Perera L, Reil K, Riehle R, Roberts M, Rodriguez D, Sasaki N, Schnetzer SR, Scott LM, Sinnis G, Smith JD, Sokolsky P, Song C, Springer RW, Stokes BT, Thomas SB, Thomas JR, Thomson GB, Tupa D, Westerhoff S, Wiencke LR, Zhang X, Zech A. First observation of the Greisen-Zatsepin-Kuzmin suppression. Phys Rev Lett 2008; 100:101101. [PMID: 18352170 DOI: 10.1103/physrevlett.100.101101] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/05/2007] [Revised: 01/07/2008] [Indexed: 05/26/2023]
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.
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Affiliation(s)
- R U Abbasi
- Department of Physics, University of Utah, Salt Lake City, Utah 84112, USA
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Abbasi RU, Abu-Zayyad T, Amann JF, Archbold G, Bellido JA, Belov K, Belz JW, Bergman DR, Cao Z, Clay RW, Cooper MD, Dai H, Dawson BR, Everett AA, Fedorova YA, Girard JHV, Gray RC, Hanlon WF, Hoffman CM, Holzscheiter MH, Hüntemeyer P, Jones BF, Jui CCH, Kieda DB, Kim K, Kirn MA, Loh EC, Manago N, Marek LJ, Martens K, Martin G, Matthews JAJ, Matthews JN, Meyer JR, Moore SA, Morrison P, Moosman AN, Mumford JR, Munro MW, Painter CA, Perera L, Reil K, Riehle R, Roberts M, Sarracino JS, Sasaki M, Schnetzer SR, Shen P, Simpson KM, Sinnis G, Smith JD, Sokolsky P, Song C, Springer RW, Stokes BT, Taylor SF, Thomas SB, Thompson TN, Thomson GB, Tupa D, Westerhoff S, Wiencke LR, VanderVeen TD, Zech A, Zhang X. Measurement of the flux of ultrahigh energy cosmic rays from monocular observations by the High Resolution Fly's Eye experiment. Phys Rev Lett 2004; 92:151101. [PMID: 15169276 DOI: 10.1103/physrevlett.92.151101] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/12/2002] [Revised: 05/28/2003] [Indexed: 05/24/2023]
Abstract
We have measured the cosmic ray spectrum above 10(17.2) eV using the two air-fluorescence detectors of the High Resolution Fly's Eye observatory operating in monocular mode. We describe the detector, phototube, and atmospheric calibrations, as well as the analysis techniques for the two detectors. We fit the spectrum to a model consisting of galactic and extragalactic sources.
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Affiliation(s)
- R U Abbasi
- Department of Physics and High Energy Astrophysics Institute, University of Utah, Salt Lake City, Utah 84112, USA
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Gottschalk EE, Avilez C, Christian DC, Church MD, Forbush M, Gutierrez G, Hartouni EP, Holmes S, Huson FR, Knapp BC, Kreisler MN, Stern BJ, Uribe J, Wehmann A, Wiencke LR, White JT. Hyperon production in 28 GeV/c proton-proton interactions. Phys Rev D Part Fields 1996; 53:4756-4774. [PMID: 10020472 DOI: 10.1103/physrevd.53.4756] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Félix J, Avilez C, Moreno G, Hartouni EP, Jensen DA, Kreisler MN, Uribe J, Christian DC, Gutierrez G, Holmes SD, Wehmann A, Church MD, Gottschalk EE, Knapp BC, Stern BJ, Wiencke LR, Forbush M, Huson FR, White JT. Study of Lambda 0 polarization in pp-->p Lambda 0K+ pi + pi - pi + pi - at 27.5 GeV. Phys Rev Lett 1996; 76:22-25. [PMID: 10060424 DOI: 10.1103/physrevlett.76.22] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Uribe J, Hartouni EP, Jensen DA, Kreisler MN, Church MD, Gottschalk EE, Knapp BC, Sippach W, Stern BJ, Wiencke LR, Christian DC, Gutierrez G, Holmes SD, Wehmann A, Avilez C, Forbush M, Huson FR, White JT. Pion-pion correlations at low relative momentum produced in p-p collisions at 27.5 GeV/c. Phys Rev D Part Fields 1994; 49:4373-4393. [PMID: 10017441 DOI: 10.1103/physrevd.49.4373] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Hartouni EP, Jensen DA, Kreisler MN, Uribe J, Church MD, Gottschalk EE, Knapp BC, Stern BJ, Wiencke LR, Christian DC, Gutierrez G, Wehmann A, Avilez C, Forbush M, Huson FR, White JT. Precise measurement of the Lambda 0 and Lambda -bar0 masses and a test of CPT invariance. Phys Rev Lett 1994; 72:1322-1325. [PMID: 10056683 DOI: 10.1103/physrevlett.72.1322] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Wiencke LR, Church MD, Gottschalk EE, Hylton RA, Knapp BC, Sippach W, Stern BJ, Hartouni EP, Jensen DA, Klima B, Kreisler MN, Rabin MS, Strait JB, Uribe J, Christian DC, Gutierrez G, Holmes SD, Wehmann A, Avilez C, Forbush M, Huson FR, White JT. Observation of Coulomb effects in production of pi + pi -, p pi -, and K+K- pairs in pp collisions at 27.5 GeV/c. Phys Rev D Part Fields 1992; 46:3708-3711. [PMID: 10015323 DOI: 10.1103/physrevd.46.3708] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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