PoS - Proceedings of Science
Volume 358 - 36th International Cosmic Ray Conference (ICRC2019) - CRI - Cosmic Ray Indirect
Measurement of the Cosmic Ray Flux near the Second Knee with the Pierre Auger Observatory
A. Coleman*  on behalf of the Pierre Auger Collaboration
Full text: pdf
Pre-published on: July 22, 2019
Published on: July 02, 2021
We present the first measurement of the energy spectrum of cosmic rays down to 100 PeV from the Pierre Auger Observatory using the part of the surface-detector array with 750 m spacing. This analysis is made possible by a set of additional particle triggers, installed in 2013, which lowers the threshold above which the array is fully efficient by half an order of magnitude. The measurement thus covers a critical energy range around 10$^{17}$ eV where previous observations have shown a change in the spectral index, the so-called second or iron knee. The work relies on a geometrical exposure, a nearly 100% duty cycle, and an almost model-independent analysis, with the energy estimation provided by the fluorescence detector. We discuss the spectrum and the associated uncertainties and compare the results to other studies in the same energy range.
DOI: https://doi.org/10.22323/1.358.0225
How to cite

Metadata are provided both in "article" format (very similar to INSPIRE) as this helps creating very compact bibliographies which can be beneficial to authors and readers, and in "proceeding" format which is more detailed and complete.

Open Access
Creative Commons LicenseCopyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.