THE COSMIC-RAY ENERGY SPECTRUM OBSERVED WITH THE SURFACE DETECTOR OF THE TELESCOPE ARRAY EXPERIMENT
T. Abu-ZayyadHigh Energy Astrophysics Institute and Department of Physics and Astronomy, University of Utah, Salt Lake City, Utah, USAR. AidaUniversity of Yamanashi, Interdisciplinary Graduate School of Medicine and Engineering, Kofu, Yamanashi, JapanM. AllenHigh Energy Astrophysics Institute and Department of Physics and Astronomy, University of Utah, Salt Lake City, Utah, USAR. AndersonHigh Energy Astrophysics Institute and Department of Physics and Astronomy, University of Utah, Salt Lake City, Utah, USAR. AzumaGraduate School of Science and Engineering, Tokyo Institute of Technology, Meguro, Tokyo, JapanE. BarcikowskiHigh Energy Astrophysics Institute and Department of Physics and Astronomy, University of Utah, Salt Lake City, Utah, USAJ. W. BelzHigh Energy Astrophysics Institute and Department of Physics and Astronomy, University of Utah, Salt Lake City, Utah, USAD. R. BergmanHigh Energy Astrophysics Institute and Department of Physics and Astronomy, University of Utah, Salt Lake City, Utah, USAS. A. BlakeHigh Energy Astrophysics Institute and Department of Physics and Astronomy, University of Utah, Salt Lake City, Utah, USAR. CadyHigh Energy Astrophysics Institute and Department of Physics and Astronomy, University of Utah, Salt Lake City, Utah, USAB. G. CheonDepartment of Physics and The Research Institute of Natural Science, Hanyang University, Seongdong-gu, Seoul, Republic of KoreaJ. ChibaDepartment of Physics, Tokyo University of Science, Noda, Chiba, JapanM. ChikawaDepartment of Physics, Kinki University, Higashi Osaka, Osaka, JapanE. J. ChoDepartment of Physics and The Research Institute of Natural Science, Hanyang University, Seongdong-gu, Seoul, Republic of KoreaW. R. ChoDepartment of Physics, Yonsei University, Seodaemun-gu, Seoul, Republic of KoreaH. FujiiInstitute of Particle and Nuclear Studies, KEK, Tsukuba, Ibaraki, JapanT. FujiiGraduate School of Science, Osaka City University, Osaka, Osaka, JapanT. FukudaGraduate School of Science and Engineering, Tokyo Institute of Technology, Meguro, Tokyo, JapanM. FukushimaInstitute for Cosmic Ray Research, University of Tokyo, Kashiwa, Chiba, JapanW. HanlonHigh Energy Astrophysics Institute and Department of Physics and Astronomy, University of Utah, Salt Lake City, Utah, USAK. HayashiGraduate School of Science and Engineering, Tokyo Institute of Technology, Meguro, Tokyo, JapanY. HayashiGraduate School of Science, Osaka City University, Osaka, Osaka, JapanN. HayashidaInstitute for Cosmic Ray Research, University of Tokyo, Kashiwa, Chiba, JapanK. HibinoFaculty of Engineering, Kanagawa University, Yokohama, Kanagawa, JapanK. HiyamaInstitute for Cosmic Ray Research, University of Tokyo, Kashiwa, Chiba, JapanK. HondaUniversity of Yamanashi, Interdisciplinary Graduate School of Medicine and Engineering, Kofu, Yamanashi, JapanT. IguchiGraduate School of Science and Engineering, Tokyo Institute of Technology, Meguro, Tokyo, JapanD. IkedaInstitute for Cosmic Ray Research, University of Tokyo, Kashiwa, Chiba, JapanK. IkutaUniversity of Yamanashi, Interdisciplinary Graduate School of Medicine and Engineering, Kofu, Yamanashi, JapanN. InoueThe Graduate School of Science and Engineering, Saitama University, Saitama, Saitama, JapanT. IshiiUniversity of Yamanashi, Interdisciplinary Graduate School of Medicine and Engineering, Kofu, Yamanashi, JapanR. IshimoriGraduate School of Science and Engineering, Tokyo Institute of Technology, Meguro, Tokyo, JapanD. IvanovDepartment of Physics and Astronomy, Rutgers University, Piscataway, USAS. IwamotoUniversity of Yamanashi, Interdisciplinary Graduate School of Medicine and Engineering, Kofu, Yamanashi, JapanC. C. H. JuiHigh Energy Astrophysics Institute and Department of Physics and Astronomy, University of Utah, Salt Lake City, Utah, USAK. KadotaDepartment of Physics, Tokyo City University, Setagaya-ku, Tokyo, JapanF. KakimotoGraduate School of Science and Engineering, Tokyo Institute of Technology, Meguro, Tokyo, JapanO. KalashevInstitute for Nuclear Research of the Russian Academy of Sciences, Moscow, RussiaT. KanbeUniversity of Yamanashi, Interdisciplinary Graduate School of Medicine and Engineering, Kofu, Yamanashi, JapanK. KasaharaAdvanced Research Institute for Science and Engineering, Waseda University, Shinjuku-ku, Tokyo, JapanH. KawaiDepartment of Physics, Chiba University, Chiba, Chiba, JapanS. KawakamiGraduate School of Science, Osaka City University, Osaka, Osaka, JapanS. KawanaThe Graduate School of Science and Engineering, Saitama University, Saitama, Saitama, JapanE. KidoInstitute for Cosmic Ray Research, University of Tokyo, Kashiwa, Chiba, JapanH. B. KimDepartment of Physics and The Research Institute of Natural Science, Hanyang University, Seongdong-gu, Seoul, Republic of KoreaH. K. KimDepartment of Physics and The Research Institute of Natural Science, Hanyang University, Seongdong-gu, Seoul, Republic of KoreaJ. H. KimDepartment of Physics and The Research Institute of Natural Science, Hanyang University, Seongdong-gu, Seoul, Republic of KoreaJ. H. KimDepartment of Physics and The Research Institute of Natural Science, Hanyang University, Seongdong-gu, Seoul, Republic of KoreaK. KitamotoDepartment of Physics, Kinki University, Higashi Osaka, Osaka, JapanS. KitamuraGraduate School of Science and Engineering, Tokyo Institute of Technology, Meguro, Tokyo, JapanY. KitamuraGraduate School of Science and Engineering, Tokyo Institute of Technology, Meguro, Tokyo, JapanK. KobayashiDepartment of Physics, Tokyo University of Science, Noda, Chiba, JapanY. KobayashiGraduate School of Science and Engineering, Tokyo Institute of Technology, Meguro, Tokyo, JapanY. KondoInstitute for Cosmic Ray Research, University of Tokyo, Kashiwa, Chiba, JapanK. KuramotoGraduate School of Science, Osaka City University, Osaka, Osaka, JapanV. KuzminInstitute for Nuclear Research of the Russian Academy of Sciences, Moscow, RussiaY. J. KwonDepartment of Physics, Yonsei University, Seodaemun-gu, Seoul, Republic of KoreaJ. LanHigh Energy Astrophysics Institute and Department of Physics and Astronomy, University of Utah, Salt Lake City, Utah, USAS. I. LimDepartment of Physics and Institute for the Early Universe, Ewha Womans University, Seodaaemun-gu, Seoul, Republic of KoreaS. MachidaGraduate School of Science and Engineering, Tokyo Institute of Technology, Meguro, Tokyo, JapanK. MartensKavli Institute for the Physics and Mathematics of the Universe, University of Tokyo, Kashiwa, Chiba, JapanT. MatsudaInstitute of Particle and Nuclear Studies, KEK, Tsukuba, Ibaraki, JapanT. MatsuuraGraduate School of Science and Engineering, Tokyo Institute of Technology, Meguro, Tokyo, JapanT. MatsuyamaGraduate School of Science, Osaka City University, Osaka, Osaka, JapanJ. N. MatthewsHigh Energy Astrophysics Institute and Department of Physics and Astronomy, University of Utah, Salt Lake City, Utah, USAM. MinaminoGraduate School of Science, Osaka City University, Osaka, Osaka, JapanK. MiyataDepartment of Physics, Tokyo University of Science, Noda, Chiba, JapanY. MuranoGraduate School of Science and Engineering, Tokyo Institute of Technology, Meguro, Tokyo, JapanI. MyersHigh Energy Astrophysics Institute and Department of Physics and Astronomy, University of Utah, Salt Lake City, Utah, USAK. NagasawaThe Graduate School of Science and Engineering, Saitama University, Saitama, Saitama, JapanS. NagatakiYukawa Institute for Theoretical Physics, Kyoto University, Sakyo, Kyoto, JapanT. NakamuraFaculty of Science, Kochi University, Kochi, Kochi, JapanS. W. NamDepartment of Physics and Institute for the Early Universe, Ewha Womans University, Seodaaemun-gu, Seoul, Republic of KoreaT. NonakaInstitute for Cosmic Ray Research, University of Tokyo, Kashiwa, Chiba, JapanS. OgioGraduate School of Science, Osaka City University, Osaka, Osaka, JapanM. OhnishiInstitute for Cosmic Ray Research, University of Tokyo, Kashiwa, Chiba, JapanH. OhokaInstitute for Cosmic Ray Research, University of Tokyo, Kashiwa, Chiba, JapanK. OkiInstitute for Cosmic Ray Research, University of Tokyo, Kashiwa, Chiba, JapanD. OkuUniversity of Yamanashi, Interdisciplinary Graduate School of Medicine and Engineering, Kofu, Yamanashi, JapanT. OkudaDepartment of Physical Sciences, Ritsumeikan University, Kusatsu, Shiga, JapanA. OshimaGraduate School of Science, Osaka City University, Osaka, Osaka, JapanS. OzawaAdvanced Research Institute for Science and Engineering, Waseda University, Shinjuku-ku, Tokyo, JapanI. H. ParkDepartment of Physics and Institute for the Early Universe, Ewha Womans University, Seodaaemun-gu, Seoul, Republic of KoreaM. S. PshirkovService de Physique Théorique, Université Libre de Bruxelles, Brussels, BelgiumD. C. RodriguezHigh Energy Astrophysics Institute and Department of Physics and Astronomy, University of Utah, Salt Lake City, Utah, USAS. Y. RohDepartment of Astronomy and Space Science, Chungnam National University, Yuseong-gu, Daejeon, Republic of KoreaG. RubtsovInstitute for Nuclear Research of the Russian Academy of Sciences, Moscow, RussiaD. RyuDepartment of Astronomy and Space Science, Chungnam National University, Yuseong-gu, Daejeon, Republic of KoreaH. SagawaInstitute for Cosmic Ray Research, University of Tokyo, Kashiwa, Chiba, JapanN. SakuraiGraduate School of Science, Osaka City University, Osaka, Osaka, JapanA. L. SampsonHigh Energy Astrophysics Institute and Department of Physics and Astronomy, University of Utah, Salt Lake City, Utah, USAL. M. ScottDepartment of Physics and Astronomy, Rutgers University, Piscataway, USAP. D. ShahHigh Energy Astrophysics Institute and Department of Physics and Astronomy, University of Utah, Salt Lake City, Utah, USAF. ShibataUniversity of Yamanashi, Interdisciplinary Graduate School of Medicine and Engineering, Kofu, Yamanashi, JapanT. ShibataInstitute for Cosmic Ray Research, University of Tokyo, Kashiwa, Chiba, JapanH. ShimodairaInstitute for Cosmic Ray Research, University of Tokyo, Kashiwa, Chiba, JapanB. K. ShinDepartment of Physics and The Research Institute of Natural Science, Hanyang University, Seongdong-gu, Seoul, Republic of KoreaJ. I. ShinDepartment of Physics, Yonsei University, Seodaemun-gu, Seoul, Republic of KoreaT. ShirahamaThe Graduate School of Science and Engineering, Saitama University, Saitama, Saitama, JapanJ. D. SmithHigh Energy Astrophysics Institute and Department of Physics and Astronomy, University of Utah, Salt Lake City, Utah, USA
2013en
ABI
Аннотация
The Telescope Array (TA) collaboration has measured the energy spectrum of ultra-high energy cosmic rays (UHECRs) 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 4.6x10(18) eV and a steepening at 5.4x10(19) eV which is consistent with the expectation from the GZK cutoff. We present the results of a technique, new to the analysis of UHECR surface detector data, that involves generating a complete simulation of UHECRs 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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