First Observation of the Greisen-Zatsepin-Kuzmin Suppression

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R. U. Abbasi¹, T. Abu-Zayyad¹, M. Allen¹, J. F. Amman², G. Archbold¹, K. Belov¹, J. W. Belz¹, S. Y. Ben Zvi³, D. R. Bergman^4,*, S. A. Blake¹, O. A. Brusova¹, G. W. Burt¹, C. Cannon¹, Z. Cao¹, B. C. Connolly³, W. Deng¹, Y. Fedorova¹, C. B. Finley³, R. C. Gray¹, W. F. Hanlon¹, C. M. Hoffman², M. H. Holzscheiter², G. Hughes⁴, P. Hüntemeyer¹, B. F Jones¹, C. C. H. Jui¹, K. Kim¹, M. A. Kirn⁵, E. C. Loh¹, M. M. Maestas¹, N. Manago⁶, L. J. Marek², K. Martens¹, J. A. J. Matthews⁷, J. N. Matthews¹, S. A. Moore¹, A. O’Neill³, C. A. Painter², L. Perera⁴, K. Reil¹, R. Riehle¹, M. Roberts⁷, D. Rodriguez¹, N. Sasaki⁶, S. R. Schnetzer⁴, L. M. Scott⁴, G. Sinnis², J. D. Smith¹, P. Sokolsky¹, C. Song³, R. W. Springer¹, B. T. Stokes¹, S. B. Thomas¹, J. R. Thomas¹, G. B. Thomson⁴, D. Tupa², S. Westerhoff³, L. R. Wiencke¹, X. Zhang³, and A. Zech⁴ (High Resolution Fly’s Eye Collaboration)
¹Department of Physics, University of Utah, Salt Lake City, Utah 84112, USA
²Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
³Department of Physics and Nevis Laboratory, Columbia University, New York, New York 10027, USA
⁴Department of Physics and Astronomy, Rutgers University—The State University of New Jersey, Piscataway, New Jersey 08854, USA
⁵Department of Physics, Montana State University, Bozeman, Montana 59717, USA
⁶Institute for Cosmic Ray Research, University of Tokyo, Kashiwa, Japan
⁷Department of Physics and Astronomy, University of New Mexico, Albuquerque, New Mexico 87131, USA

^*Corresponding author.

bergman@physics.rutgers.edu