期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 768, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/768/1/L1
关键词
astroparticle physics; cosmic rays; methods: data analysis
资金
- Japan Society for the Promotion of Science [21000002, 19104006]
- Institute for Cosmic Ray Research
- U.S. National Science Foundation [PHY-0307098, PHY-0601915, PHY-0703893, PHY-0758342, PHY-0848320, PHY-0649681]
- National Research Foundation of Korea [2006-0050031, 2007-0056005, 2007-0093860, 2010-0011378, 2010-0028071, R32-10130, 2011-0002617]
- Russian Academy of Sciences
- RFBR [10-02-01406a, 11-02-01528a]
- IISN [4.4509.10]
- Belgian Science Policy under IUAP [VI/11]
- Economic Development Board
- University of Utah through the Office of the Vice President for Research
- Direct For Mathematical & Physical Scien
- Division Of Physics [1069286, 1069280, 969510] Funding Source: National Science Foundation
- Grants-in-Aid for Scientific Research [23103001, 23654078, 21000002] Funding Source: KAKEN
- National Research Foundation of Korea [2007-0056005, 2010-0011378] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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