Measurement of the cosmic-ray energy spectrum above 2.5 x 10(18) eV using the Pierre Auger Observatory

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F20%3A73602153" target="_blank" >RIV/61989592:15310/20:73602153 - isvavai.cz</a>
Alternative codes found
RIV/00216208:11320/20:10421879
Result on the web
<a href="https://journals.aps.org/prd/pdf/10.1103/PhysRevD.102.062005" target="_blank" >https://journals.aps.org/prd/pdf/10.1103/PhysRevD.102.062005</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/PhysRevD.102.062005" target="_blank" >10.1103/PhysRevD.102.062005</a>

Result language
angličtina
Original language name
Measurement of the cosmic-ray energy spectrum above 2.5 x 10(18) eV using the Pierre Auger Observatory
Original language description
We report a measurement of the energy spectrum of cosmic rays for energies above 2.5 x 10(18) eV based on 215,030 events recorded with zenith angles below 60 degrees. A key feature of the work is that the estimates of the energies are independent of assumptions about the unknown hadronic physics or of the primary mass composition. The measurement is the most precise made hitherto with the accumulated exposure being so large that the measurements of the flux are dominated by systematic uncertainties except at energies above 5 x 10(19) eV. The principal conclusions are (1) The flattening of the spectrum near 5 x 10(18) eV, the so-called "ankle," is confirmed. (2) The steepening of the spectrum at around 5 x 10(19) eV is confirmed. (3) A new feature has been identified in the spectrum: in the region above the ankle the spectral index gamma of the particle flux (proportional to E-gamma) changes from 2.51 +/- 0.03 (stat) +/- 0.05 (syst) to 3.05 +/- 0.05 (stat) +/- 0.10 (syst) before changing sharply to 5.1 +/- 0.3 (stat) +/- 0.1 (syst) above 5 x 10(19) eV. (4) No evidence for any dependence of the spectrum on declination has been found other than a mild excess from the Southern Hemisphere that is consistent with the anisotropy observed above 8 x 10(18) eV.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10303 - Particles and field physics

Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2020
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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