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The Cosmic Ray Energy Spectrum Observed with the Surface Detector of the Telescope Array Experiment

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arxiv 1205.5067 v3 pith:HPO235SK submitted 2012-05-22 astro-ph.HE

The Cosmic Ray Energy Spectrum Observed with the Surface Detector of the Telescope Array Experiment

T. Abu-Zayyad , R. Aida , M. Allen , R. Anderson , R. Azuma , E. Barcikowski , J.W. Belz , D.R. Bergman
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S.A. Blake R. Cady B.G. Cheon J. Chiba M. Chikawa E.J. Cho W.R. Cho H. Fujii T. Fujii T. Fukuda M. Fukushima W. Hanlon K. Hayashi Y. Hayashi N. Hayashida K. Hibino K. Hiyama K. Honda T. Iguchi D. Ikeda K. Ikuta N. Inoue T. Ishii R. Ishimori D. Ivanov S. Iwamoto C.C.H. Jui K. Kadota F. Kakimoto O. Kalashev T. Kanbe K. Kasahara H. Kawai S. Kawakami S. Kawana E. Kido H.B. Kim H.K. Kim J.H. Kim K. Kitamoto S. Kitamura Y. Kitamura K. Kobayashi Y. Kobayashi Y. Kondo K. Kuramoto V. Kuzmin Y.J. Kwon J. Lan S.I. Lim S. Machida K. Martens T. Matsuda T. Matsuura T. Matsuyama J.N. Matthews M. Minamino K. Miyata Y. Murano I. Myers K. Nagasawa S. Nagataki T. Nakamura S.W. Nam T. Nonaka S. Ogio M. Ohnishi H. Ohoka K. Oki D. Oku T. Okuda A. Oshima S. Ozawa I.H. Park M.S. Pshirkov D.C. Rodriguez S.Y. Roh G. Rubtsov D. Ryu H. Sagawa N. Sakurai A.L. Sampson L.M. Scott P.D. Shah F. Shibata T. Shibata H. Shimodaira B.K. Shin J.I. Shin T. Shirahama J.D. Smith P. Sokolsky B.T. Stokes S.R. Stratton T.A. Stroman S. Suzuki Y. Takahashi M. Takeda A. Taketa M. Takita Y. Tameda H. Tanaka K. Tanaka M. Tanaka S.B. Thomas G.B. Thomson P. Tinyakov I. Tkachev H. Tokuno T. Tomida S. Troitsky Y. Tsunesada K. Tsutsumi Y. Tsuyuguchi Y. Uchihori S. Udo H. Ukai G. Vasiloff Y. Wada T. Wong M. Wood Y. Yamakawa R. Yamane H. Yamaoka K. Yamazaki J. Yang Y. Yoneda S. Yoshida H. Yoshii X. Zhou R. Zollinger Z. Zundel
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classification astro-ph.HE
keywords energydetectorcosmicsurfacespectrumultra-higharrayenergies
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The Telescope Array (TA) collaboration has measured the energy spectrum of ultra-high energy cosmic rays with primary energies above 1.6 x 10^(18) eV. This measurement is based upon four years of observation by the surface detector component of TA. The spectrum shows a dip at an energy of 4.6 x 10^(18) eV and a steepening at 5.4 x 10^(19) eV which is consistent with the expectation from the GZK cutoff. We present the results of a technique, new to the analysis of ultra-high energy cosmic ray surface detector data, that involves generating a complete simulation of ultra-high energy cosmic rays striking the TA surface detector. The procedure starts with shower simulations using the CORSIKA Monte Carlo program where we have solved the problems caused by use of the "thinning" approximation. This simulation method allows us to make an accurate calculation of the acceptance of the detector for the energies concerned.

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