Z
Z. Cao
Researcher at University of Utah
Publications - 55
Citations - 3422
Z. Cao is an academic researcher from University of Utah. The author has contributed to research in topics: Cosmic ray & Air shower. The author has an hindex of 25, co-authored 45 publications receiving 3332 citations. Previous affiliations of Z. Cao include Chinese Academy of Sciences & University of Adelaide.
Papers
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Journal ArticleDOI
First observation of the Greisen-Zatsepin-Kuzmin suppression.
Rasha Abbasi,Tareq Abu-Zayyad,M. Allen,J. F. Amman,G. Archbold,Konstantin Belov,John Belz,S. Y. Ben Zvi,Douglas 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,William Hanlon,C. M. Hoffman,Michael H. Holzscheiter,Gareth 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,John Matthews,John N. Matthews,S. A. Moore,A. O’Neill,C. A. Painter,L. Perera,Kevin Reil,R. Riehle,M. D. Roberts,D. Rodriguez,Naruo Sasaki,Steve Schnetzer,L. M. Scott,G. Sinnis,J. D. Smith,Pierre Sokolsky,C. Song,R. W. Springer,B. T. Stokes,S. B. Thomas,J. R. Thomas,Gordon Thomson,Dale Tupa,S. Westerhoff,Lawrence Wiencke,Xiang Zhang,A. Zech +59 more
TL;DR: High Resolution Fly's Eye's 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.
Journal ArticleDOI
Indications of proton-dominated cosmic-ray composition above 1.6 EeV.
Rasha Abbasi,Tareq Abu-Zayyad,M. Al-Seady,M. Allen,J. F. Amman,Ross Anderson,G. Archbold,Konstantin Belov,John Belz,Douglas Bergman,S. A. Blake,O. A. Brusova,G. W. Burt,C. Cannon,Z. Cao,W. Deng,Y. Fedorova,C. B. Finley,R. C. Gray,William Hanlon,C. M. Hoffman,Michael H. Holzscheiter,Gareth Hughes,P. Hüntemeyer,B. F. Jones,C. C. H. Jui,K. Kim,M. A. Kirn,E. C. Loh,J. Liu,J. P. Lundquist,M. M. Maestas,N. Manago,L. J. Marek,K. Martens,J. A.J. Matthews,John N. Matthews,S. A. Moore,A. O’Neill,C. A. Painter,L. Perera,Kevin Reil,R. Riehle,M. D. Roberts,D. Rodriguez,Naruo Sasaki,Steve Schnetzer,L. M. Scott,G. Sinnis,J. D. Smith,Pierre Sokolsky,C. Song,R. W. Springer,B. T. Stokes,S. R. Stratton,S. B. Thomas,J. R. Thomas,Gordon Thomson,Dale Tupa,A. Zech,Xiang Zhang +60 more
TL;DR: These measurements constrain models in which the galactic-to-extragalactic transition is the cause of the energy spectrum ankle at 4x10(18) eV, and are consistent with a predominantly protonic composition of cosmic rays when interpreted via the Q GSJET01 and QGSJET-II high-energy hadronic interaction models.
Journal ArticleDOI
Measurement of the flux of ultrahigh energy cosmic rays from monocular observations by the High Resolution Fly's Eye experiment.
Rasha Abbasi,Tareq Abu-Zayyad,James F. Amann,G. Archbold,Jose A. Bellido,Konstantin Belov,John Belz,Douglas Bergman,Z. Cao,Roger W Clay,M.D. Cooper,H. Y. Dai,Bruce R. Dawson,A.A. Everett,Yu. A. Fedorova,Julien Girard,R. C. Gray,William Hanlon,C. M. Hoffman,Michael H. Holzscheiter,P. Hüntemeyer,B. F. Jones,C. C. H. Jui,David Kieda,K. Kim,M. A. Kirn,E. C. Loh,N. Manago,L. J. Marek,K. Martens,G. Martin,J. A.J. Matthews,John N. Matthews,J. R. Meyer,S. A. Moore,P. Morrison,A. N. Moosman,J.R. Mumford,M. W. Munro,C. A. Painter,L. Perera,Kevin Reil,R. Riehle,M. D. Roberts,J. S. Sarracino,Misao Sasaki,Steve Schnetzer,P. Shen,K. M. Simpson,G. Sinnis,J. D. Smith,Pierre Sokolsky,C. Song,R. W. Springer,B. T. Stokes,S. Taylor,S. B. Thomas,T.N. Thompson,Gordon Thomson,Dale Tupa,S. Westerhoff,Lawrence Wiencke,T. Vanderveen,A. Zech,Xiang Zhang +64 more
TL;DR: The cosmic ray spectrum is measured using the two air-fluorescence detectors of the High Resolution Fly's Eye observatory operating in monocular mode to fit the spectrum to a model consisting of galactic and extragalactic sources.
Journal ArticleDOI
A Study of the Composition of Ultra-High-Energy Cosmic Rays Using the High-Resolution Fly’s Eye
Rasha Abbasi,Tareq Abu-Zayyad,G. Archbold,G. Archbold,R. W. Atkins,Jose A. Bellido,Konstantin Belov,John Belz,Segev BenZvi,Douglas Bergman,J. H. Boyer,G. W. Burt,Z. Cao,Roger W Clay,B.M. Connolly,Bruce R. Dawson,W. Deng,Y. Fedorova,J. Findlay,C. B. Finley,William Hanlon,Gareth Hughes,P. Hüntemeyer,C. C. H. Jui,K. Kim,M. A. Kirn,B. C. Knapp,E. C. Loh,M. M. Maetas,K. Martens,G. Martin,N. Manago,E. J. Mannel,J. A.J. Matthews,John N. Matthews,A. O’Neill,L. Perera,Kevin Reil,R. Riehle,M. D. Roberts,M. Sasaki,M. Seman,Steve Schnetzer,K. M. Simpson,J. D. Smith,R. Snow,Pierre Sokolsky,C. Song,R. W. Springer,B. T. Stokes,J. R. Thomas,S. B. Thomas,Gordon Thomson,S. Westerhoff,Lawrence Wiencke,A. Zech +55 more
TL;DR: In this article, the authors measured the composition of ultra-high-energy cosmic rays with the High Resolution Fly's Eye cosmic-ray observatory data using the Xmax technique and found the detector resolution was 30 g cm-2 in Xmax and 13% in energy.
Journal ArticleDOI
Measurement of the cosmic-ray energy spectrum and composition from 1017 to 1018.3 eV using a hybrid technique
Tareq Abu-Zayyad,Konstantin Belov,D. J. Bird,J. H. Boyer,Z. Cao,M. Catanese,G. F. Chen,Roger W Clay,Corbin Covault,H. Y. Dai,Bruce R. Dawson,J. W. Elbert,Brian Fick,Lucy Fortson,Joseph W. Fowler,K. Gibbs,M. A. K. Glasmacher,K. D. Green,Y. Ho,A. Huang,C. C. H. Jui,M. J. Kidd,David Kieda,B. C. Knapp,S. Ko,C. G. Larsen,Weonjong Lee,E. C. Loh,E. J. Mannel,John Matthews,John Matthews,John N. Matthews,B. J. Newport,D. Nitz,R. A. Ong,K. M. Simpson,J. D. Smith,D. Sinclair,Pierre Sokolsky,Paul Sommers,C. Song,J. K. K. Tang,S. B. Thomas,J. C. van der Velde,Lawrence Wiencke,C. R. Wilkinson,S. Yoshida,X. Z. Zhang +47 more
TL;DR: In this article, the authors studied the spectrum and average mass composition of cosmic rays with primary energies between 1017 and 1018 eV using a hybrid detector consisting of the High Resolution Fly's Eye (HiRes) prototype and the Michigan Muon Array (MIA).