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- W4385306075 abstract "The nuclear species responsible for the flux of the ultra-high-energy cosmic rays (UHECRs) at Earth can be retrieved from the distributions of the depth in the atmosphere at which the maximum number of particles in the extensive air showers is reached, i.e. 𝑋max. This is done by fitting model predictions of four or five mass groups (p, He, N, Si and Fe) to the measured 𝑋max distributions. The derived mass-fractions-to-energy curves show that different nuclear species dominate different energy ranges. In this contribution, we investigate this finding by assuming a parametric model for each elemental spectrum and fitting, at the same time, the energy spectrum and the 𝑋max distributions measured by the Pierre Auger Observatory without taking into account the extragalactic propagation in the fit procedure. We find that the peaks of the fractions-to-energy curves at Earth above 1017.8 eV exhibit a Lorentz-factor dependence that appears to be mainly driven by the UHECR spectral parameters describing the energy range above the “ankle. Despite the low maximum rigidity found in current astrophysical scenarios interpreting the UHECR data at the highest energies, our work confirms the relevance of the photo-hadronic interactions in shaping the observed cosmic-ray flux at Earth." @default.
- W4385306075 created "2023-07-28" @default.
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- W4385306075 date "2023-07-25" @default.
- W4385306075 modified "2023-09-26" @default.
- W4385306075 title "Imprints of extragalactic propagation in the UHECR mass composition at the top of the atmosphere" @default.
- W4385306075 doi "https://doi.org/10.22323/1.444.0316" @default.
- W4385306075 hasPublicationYear "2023" @default.
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