Abstract
Primary cosmic ray energy spectrum around and above 1 PeV is of great interest due to its non-power-law behavior (“knee”) in PeV region found many years ago using the indirect EAS (Extensive Air Shower) method. The method is based on secondary particles measuring on Earth’s surface under a thick atmosphere. Traditionally, people use detectors sensitive to ionization produced mostly by secondary electromagnetic component and therefore any found changes in EAS size spectrum correspond to secondary components, which have to be recalculated to primary spectrum. Recently some new “knees” were claimed by high altitude experiments: at ∼45 TeV for all-particle spectrum (HAWC), for primary protons and helium: at ∼400 TeV (Tibet ASγ) and at ∼700 TeV (ARGO-YBJ) thus widening the “knee” region from ∼0.045 to 5 PeV. The natural explanation of such a strange spectrum behavior in a wide energy range could be found in the EAS phenomenological approach to the knee problem.
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References
G. T. Zatsepin, Dokl. AN SSSR 67, 993 (1949).
G. T. Zatsepin, PhD Thesis, Lebedev Phys. Inst. (Moscow, 1954).
K. Greisen, Annu. Rev. Nucl. Sci. 10, 63 (1960).
Yu. V. Stenkin, Mod. Phys. Lett. A 18, 1225 (2003).
Yu. V. Stenkin, Phys. At. Nucl. 71, 98 (2008).
P. Lipari, Astropart. Phys. 97, 197 (2018).
R. Alfaro et al. (HAWC Collab.), Phys. Rev. D 96, 122001 (2017).
B. Bartoli et al. (ARGO-YBJ Collab., LHAASO Collab.), Phys. Rev. D 92, 092005 (2015).
M. Amenomori et al. (TibetASγ Collab.), EPJ Web Conf. 208, 03001 (2019). https://doi.org/10.1051/epjconf/201920803001
Funding
This work was supported in Russia by RFBR (1802-00339, 16-29-13067 ofi_m) and “The Physics of Fundamental Interactions and Nuclear Technologies” RAS Presidium Program.
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Stenkin, Y.V. EAS Phenomenology and Cosmic Ray Spectrum Ground Based Measurements. Phys. Atom. Nuclei 82, 808–811 (2019). https://doi.org/10.1134/S1063778819660475
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DOI: https://doi.org/10.1134/S1063778819660475