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Title: Features of the Energy Spectrum of Cosmic Rays above 2.5 × 10 18     eV Using the Pierre Auger Observatory

Journal Article · · Physical Review Letters
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We report a measurement of the energy spectrum of cosmic rays above 2.5×1018 eV based on 215030 events. New results are presented: at about 1.3×1019 eV, the spectral index changes from 2.51±0.03(stat)±0.05(syst) to 3.05±0.05(stat)±0.10(syst), evolving to 5.1±0.3(stat)±0.1(syst) beyond 5×1019 eV, while no significant dependence of spectral features on the declination is seen in the accessible range. These features of the spectrum can be reproduced in models with energy-dependent mass composition. The energy density in cosmic rays above 5×1018 eV is [5.66±0.03(stat)±1.40(syst)]×1053 erg Mpc-3.

Research Organization:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP)
Contributing Organization:
The Pierre Auger Collaboration
Grant/Contract Number:
AC02-07CH11359; FR02-04ER41300; FG02-99ER41107; SC0011689
OSTI ID:
1661744
Alternate ID(s):
OSTI ID: 1668401
Report Number(s):
arXiv:2008.06488; FERMILAB-PUB-20-431-E-TD; PRLTAO; 121106
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Vol. 125 Journal Issue: 12; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Figures / Tables (3)

FIG. 1(p. 6)figure FIG. 1
TABLE I(p. 6)table TABLE I
FIG. 2(p. 7)figure FIG. 2

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Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
cosmic ray & astroparticle detectors
cosmic ray acceleration
cosmic ray composition & spectra
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