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http://hdl.handle.net/20.500.12386/23872
Title: | Measurement of the cosmic ray spectrum above 4 × 10<SUP>18</SUP> eV using inclined events detected with the Pierre Auger Observatory | Authors: | Pierre Auger Collaboration AGLIETTA, MARCO CASTELLINA, ANTONELLA GORGI, Alessio MESSINA, Sergio RIGGI, Simone SEGRETO, ALBERTO Zuccarello, Francesca |
Issue Date: | 2015 | Journal: | JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | Number: | 2015 | Issue: | 8 | First Page: | 049 | Abstract: | A measurement of the cosmic-ray spectrum for energies exceeding 4×10<SUP>18</SUP> eV is presented, which is based on the analysis of showers with zenith angles greater than 60° detected with the Pierre Auger Observatory between 1 January 2004 and 31 December 2013. The measured spectrum confirms a flux suppression at the highest energies. Above 5.3×10<SUP>18</SUP> eV, the ``ankle'', the flux can be described by a power law E<SUP>-γ</SUP> with index γ=2.70 ± 0.02 (stat) ± 0.1 (sys) followed by a smooth suppression region. For the energy (E<SUB>s</SUB>) at which the spectral flux has fallen to one-half of its extrapolated value in the absence of suppression, we find E<SUB>s</SUB>=(5.12±0.25 (stat)<SUP>+1.0</SUP><SUB>-1.2</SUB> (sys))×10<SUP>19</SUP> eV. | URI: | http://hdl.handle.net/20.500.12386/23872 | URL: | https://iopscience.iop.org/article/10.1088/1475-7516/2015/08/049 | ISSN: | 1475-7516 | DOI: | 10.1088/1475-7516/2015/08/049 | Bibcode ADS: | 2015JCAP...08..049P | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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