Measurement of the cosmic ray spectrum above 4 × 10<SUP>18</SUP> eV using inclined events detected with the Pierre Auger Observatory

A measurement of the cosmic-ray spectrum for energies exceeding 4×10¹⁸ 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 5.3×10¹⁸ eV, the ``ankle'', the flux can be described by a power law E^-γ with index γ=2.70 ± 0.02 (stat) ± 0.1 (sys) followed by a smooth suppression region. For the energy (E_s) at which the spectral flux has fallen to one-half of its extrapolated value in the absence of suppression, we find E_s=(5.12±0.25 (stat)^+1.0_-1.2 (sys))×10¹⁹ eV.

Volume

2015

Issue

8

Start page

049

Uri

http://hdl.handle.net/20.500.12386/23872

Url

https://iopscience.iop.org/article/10.1088/1475-7516/2015/08/049

Issn Identifier

1475-7516

Ads BibCode

2015JCAP...08..049P

Rights

open.access

File(s)

Name

1503.07786-doi10.10881475-7516201508049.pdf

Description

postprint

Size

814.94 KB

Format

Adobe PDF

Checksum (MD5)

d6cb45d1335a79a3aef6739b1c8bda96

Measurement of the cosmic ray spectrum above 4 × 10¹⁸ eV using inclined events detected with the Pierre Auger Observatory

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Measurement of the cosmic ray spectrum above 4 × 10¹⁸ eV using inclined events detected with the Pierre Auger Observatory