Evidence for a High-Energy Cosmic-Ray Spectrum Cutoff
R. M. BaltrusaitisDepartment of Physics, University of Utah, Salt Lake City, Utah 84112R. CadyDepartment of Physics, University of Utah, Salt Lake City, Utah 84112G. L. CassidayDepartment of Physics, University of Utah, Salt Lake City, Utah 84112Rachel CooperDepartment of Physics, University of Utah, Salt Lake City, Utah 84112J. W. ElbertDepartment of Physics, University of Utah, Salt Lake City, Utah 84112P. R. GerhardyDepartment of Physics, University of Utah, Salt Lake City, Utah 84112Seung Hwan KoDepartment of Physics, University of Utah, Salt Lake City, Utah 84112E. C. LohDepartment of Physics, University of Utah, Salt Lake City, Utah 84112Y. MizumotoDepartment of Physics, University of Utah, Salt Lake City, Utah 84112M. H. SalamonDepartment of Physics, University of Utah, Salt Lake City, Utah 84112P. SokolskyDepartment of Physics, University of Utah, Salt Lake City, Utah 84112D. SteckDepartment of Physics, University of Utah, Salt Lake City, Utah 84112
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We report a measurement of the ultrahigh-energy cosmic-ray spectrum using an atmospheric fluorescence technique for extensive-air-shower detection. The differential spectrum between 0.1 and 10 EeV (1 EeV = ${10}^{18}$ eV) is well fitted by a power law with slope 2.94\ifmmode\pm\else\textpm\fi{}0.02. Above 10 EeV evidence is presented for the development of a spectral "bump" followed by a cutoff at 70 EeV.
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