Measurement of the Energy Spectrum of Cosmic Rays above $10^{18}$ eV Using the Pierre Auger Observatory

Abraham, J.

doi:10.1016/j.physletb.2010.02.013

Measurement of the Energy Spectrum of Cosmic Rays above $$10^{18}$$ eV Using the Pierre Auger Observatory

Journal Article · Mon Feb 01 04:00:00 EST 2010 · Phys.Lett.B

DOI:https://doi.org/10.1016/j.physletb.2010.02.013· OSTI ID:1872091

Abraham, J.

We report a measurement of the flux of cosmic rays with unprecedented precision and statistics using the Pierre Auger Observatory. Based on fluorescence observations in coincidence with at least one surface detector we derive a spectrum for energies above 10 18 eV. We also update the previously published energy spectrum obtained with the surface detector array. The two spectra are combined addressing the systematic uncertainties and, in particular, the influence of the energy resolution on the spectral shape. The spectrum can be described by a broken power law E-γ with index γ=3.3 below the ankle which is measured at log10(Eankle/eV)=18.6 . Above the ankle the spectrum is described by a power law with index 2.6 followed by a flux suppression, above about log10(E/eV)=19.5 , detected with high statistical significance.

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Research Organization:: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)

Contributing Organization:: Pierre Auger

DOE Contract Number:: AC02-07CH11359

OSTI ID:: 1872091

Report Number(s):: FERMILAB-PUB-10-093-A; arXiv:1002.1975; oai:inspirehep.net:845562

Journal Information:: Phys.Lett.B, Journal Name: Phys.Lett.B Vol. 685

Country of Publication:: United States

Language:: English

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