We present a measurement of the cosmic-ray spectrum above 100 PeV using the part of the surface detector of the Pierre Auger Observatory that has a spacing of 750 m. An inflection of the spectrum is observed, confirming the presence of the so-called second-knee feature. The spectrum is then combined with that of the 1500 m array to produce a single measurement of the flux, linking this spectral feature with the three additional breaks at the highest energies. The combined spectrum, with an energy scale set calorimetrically via fluorescence telescopes and using a single detector type, results in the most statistically and systematically precise measurement of spectral breaks yet obtained. These measurements are critical for furthering our understanding of the highest energy cosmic rays.

The energy spectrum of cosmic rays beyond the turn-down around 1017 eV as measured with the surface detector of the Pierre Auger Observatory / Abreu, P., Aglietta, M., Albury, J.M., Allekotte, I., Almela, A., Alvarez-Muniz, J., Alves Batista, R., Anastasi, G.A., Anchordoqui, L., Andrada, B., Andringa, S., Aramo, C., Araujo Ferreira, P.R., Arteaga Velazquez, J.C., Asorey, H., Assis, P., Avila, G., Badescu, A.M., Bakalova, A., Balaceanu, A., et al.. - In: THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6044. - 81:11(2021), pp. 1-25. [10.1140/epjc/s10052-021-09700-w]

The energy spectrum of cosmic rays beyond the turn-down around 1017 eV as measured with the surface detector of the Pierre Auger Observatory

Mastrodicasa M.;
2021

Abstract

We present a measurement of the cosmic-ray spectrum above 100 PeV using the part of the surface detector of the Pierre Auger Observatory that has a spacing of 750 m. An inflection of the spectrum is observed, confirming the presence of the so-called second-knee feature. The spectrum is then combined with that of the 1500 m array to produce a single measurement of the flux, linking this spectral feature with the three additional breaks at the highest energies. The combined spectrum, with an energy scale set calorimetrically via fluorescence telescopes and using a single detector type, results in the most statistically and systematically precise measurement of spectral breaks yet obtained. These measurements are critical for furthering our understanding of the highest energy cosmic rays.
2021
pierre auger observatory; cosmic rays; spectrum
01 Pubblicazione su rivista::01a Articolo in rivista
The energy spectrum of cosmic rays beyond the turn-down around 1017 eV as measured with the surface detector of the Pierre Auger Observatory / Abreu, P., Aglietta, M., Albury, J.M., Allekotte, I., Almela, A., Alvarez-Muniz, J., Alves Batista, R., Anastasi, G.A., Anchordoqui, L., Andrada, B., Andringa, S., Aramo, C., Araujo Ferreira, P.R., Arteaga Velazquez, J.C., Asorey, H., Assis, P., Avila, G., Badescu, A.M., Bakalova, A., Balaceanu, A., et al.. - In: THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6044. - 81:11(2021), pp. 1-25. [10.1140/epjc/s10052-021-09700-w]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1752297
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