ATLAS measured charged-particle production in 9.62 TeV p-O collisions, yielding a fiducial pO cross section of 396 mb and extrapolated p-air inelastic cross section of 406 mb, with distributions an order of magnitude more precise than hadronic model differences.
Observation of a Large-scale Anisotropy in the Arrival Directions of Cosmic Rays above $8 \times 10^{18}$ eV
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abstract
Cosmic rays are atomic nuclei arriving from outer space that reach the highest energies observed in nature. Clues to their origin come from studying the distribution of their arrival directions. Using $3 \times 10^4$ cosmic rays above $8 \times 10^{18}$ electron volts, recorded with the Pierre Auger Observatory from a total exposure of 76,800 square kilometers steradian year, we report an anisotropy in the arrival directions. The anisotropy, detected at more than the 5.2$\sigma$ level of significance, can be described by a dipole with an amplitude of $6.5_{-0.9}^{+1.3}$% towards right ascension $\alpha_{d} = 100 \pm 10$ degrees and declination $\delta_{d} = -24_{-13}^{+12}$ degrees. That direction indicates an extragalactic origin for these ultra-high energy particles.
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An enhanced equi-zenith angle method is developed that measures cosmic-ray anisotropies over multiple time frames while determining detection efficiency directly from the data.
Spatiotemporal analysis of Auger UHECR data reveals 5.8 sigma conditional post-trial association of 28 doublets with nearby radio galaxies, especially Fornax A, suggesting them as sources of heavy nuclei.
SKA-Low can resolve double-bump air shower profiles to constrain hadronic interaction properties and cosmic-ray mass composition between 10^16 and 10^18 eV.
citing papers explorer
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Measurement of charged-particle production in $\sqrt{s_\text{NN}}=9.62$ TeV proton-oxygen collisions as a probe of cosmic-ray air showers with the ATLAS detector
ATLAS measured charged-particle production in 9.62 TeV p-O collisions, yielding a fiducial pO cross section of 396 mb and extrapolated p-air inelastic cross section of 406 mb, with distributions an order of magnitude more precise than hadronic model differences.
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Enhanced All-Distance Equi-Zenith Angle Method for Cosmic-Ray Anisotropy Measurement
An enhanced equi-zenith angle method is developed that measures cosmic-ray anisotropies over multiple time frames while determining detection efficiency directly from the data.
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UHECR doublets and their conditional association with nearby radio galaxies
Spatiotemporal analysis of Auger UHECR data reveals 5.8 sigma conditional post-trial association of 28 doublets with nearby radio galaxies, especially Fornax A, suggesting them as sources of heavy nuclei.
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Anomalous Air Showers and What They Reveal About Hadronic Interactions and Cosmic-ray Masses
SKA-Low can resolve double-bump air shower profiles to constrain hadronic interaction properties and cosmic-ray mass composition between 10^16 and 10^18 eV.