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First observation of the Greisen-Zatsepin-Kuzmin suppression.
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 CC, Kim K, Kirn MA, Loh EC, Maestas MM, Manago N, Marek LJ, Martens K, Matthews JA, 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; High Resolution Fly's Eye Collaboration. Abbasi RU, et al. Among authors: amman jf. Phys Rev Lett. 2008 Mar 14;100(10):101101. doi: 10.1103/PhysRevLett.100.101101. Epub 2008 Mar 10. Phys Rev Lett. 2008. PMID: 18352170
Indications of proton-dominated cosmic-ray composition above 1.6 EeV.
Abbasi RU, Abu-Zayyad T, Al-Seady M, Allen M, Amman JF, Anderson RJ, Archbold G, Belov K, Belz JW, Bergman DR, Blake SA, Brusova OA, Burt GW, Cannon C, Cao Z, Deng W, Fedorova Y, Finley CB, Gray RC, Hanlon WF, Hoffman CM, Holzscheiter MH, Ivanov D, Hughes G, Hüntemeyer P, Ivanov D, Jones BF, Jui CC, Kim K, Kirn MA, Loh EC, Liu J, Lundquist JP, Maestas MM, Manago N, Marek LJ, Martens K, Matthews JA, 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, Stratton S, Thomas SB, Thomas JR, Thomson GB, Tupa D, Zech A, Zhang X; High Resolution Fly's Eye Collaboration. Abbasi RU, et al. Among authors: amman jf. Phys Rev Lett. 2010 Apr 23;104(16):161101. doi: 10.1103/PhysRevLett.104.161101. Epub 2010 Apr 20. Phys Rev Lett. 2010. PMID: 20482038