R. Anderson
University of Utah
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Featured researches published by R. Anderson.
Physical Review Letters | 2010
R. Abbasi; T. Abu-Zayyad; M. Al-Seady; M. Allen; J.F. Amman; R. Anderson; G. Archbold; K. Belov; J.W. Belz; D. R. Bergman; S.A. Blake; O. A. Brusova; G. W. Burt; C. Cannon; Z. Cao; W. Deng; Y. Fedorova; C. Finley; R.C. Gray; W. Hanlon; C. M. Hoffman; M. H. Holzscheiter; G. Hughes; P. Hüntemeyer; B.F. Jones; Charles C. H. Jui; K. Kim; M.A. Kirn; E. C. Loh; J. Liu
We report studies of ultrahigh-energy cosmic-ray composition via analysis of depth of air shower maximum (X(max)), for air shower events collected by the High-Resolution Flys Eye (HiRes) observatory. The HiRes data are consistent with a constant elongation rate d/d[log(E)] of 47.9+/-6.0(stat)+/-3.2(syst) g/cm2/decade for energies between 1.6 and 63 EeV, and are consistent with a predominantly protonic composition of cosmic rays when interpreted via the QGSJET01 and QGSJET-II high-energy hadronic interaction models. These measurements constrain models in which the galactic-to-extragalactic transition is the cause of the energy spectrum ankle at 4x10(18) eV.
Physical Review Letters | 2010
R. Abbasi; T. Abu-Zayyad; M. Al-Seady; M. Allen; J.F. Amman; R. Anderson; G. Archbold; K. Belov; J.W. Belz; D. R. Bergman; S.A. Blake; O. A. Brusova; G. W. Burt; C. Cannon; Z. Cao; W. Deng; Y. Fedorova; C. Finley; R.C. Gray; W. Hanlon; C. M. Hoffman; M. H. Holzscheiter; G. Hughes; P. Hüntemeyer; D. Ivanov; B.F. Jones; Charles C. H. Jui; K. Kim; M. A. Kirn; E. C. Loh
