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Rome University 1
13 Aug 2024
astrophysics-of-galaxieshigh-energy-astrophysical-phenomenahigh-energy-physics-phenomenology

UHECR Clustering: Lightest Nuclei from Local Sheet Galaxies

Southern Federal UniversityNational University of Oil and Gas Gubkin UniversityRome University 1National Research Nuclear University ","MEPhI
A new model proposes that ultra-high-energy cosmic rays (UHECRs) at tens of EeV energies consist primarily of fragile lightest nuclei, like helium and deuterium, originating from nearby Local Sheet galaxies, rather than distant protons. This approach explains observed UHECR composition changes, hot spots correlating with nearby galaxies, and the absence of signals from the Virgo Cluster due to the short propagation distance of these nuclei.
07 Dec 2025
high-energy-astrophysical-phenomenasolar-and-stellar-astrophysicshigh-energy-physics-phenomenology

Over-abundant gamma-like signals around Solar disk shadows by twin bent and smeared muon and electron pairs secondaries, versus rare local TeV gamma

Universidad de AntofagastaUniversity of DurhamSouthern Federal UniversityGubkin UniversityUniversidad Politecnica de PachucaOsservatorio Astronomico di Capodimonte, INAFRome University 1
Cosmic rays with energies of tens of TeV and above, skimming the Sun, could fragment into pions. The resulting gamma photons and muons, as well as subsequent electron pairs, will reach us in the form of gamma or electromagnetic air-showers , gamma-like air-showers on Earth. Their multiple presence may soon be observed and disentangled by the LHAASO telescope array.
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