| Title: | Composition at the “ankle” measured by the Pierre Auger Observatory: pure or mixed? |
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| Authors: | ID Yushkov, Alexey (Author)
ID Filipčič, Andrej (Author)
ID Kukec Mezek, Gašper (Author)
ID Saleh, Ahmed (Author)
ID Stanič, Samo (Author)
ID Trini, Marta (Author)
ID Veberič, Darko (Author)
ID Vorobiov, Serguei (Author)
ID Yang, Lili (Author)
ID Zavrtanik, Danilo (Author)
ID Zavrtanik, Marko (Author), et al. |
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| Files: |  ICRC2015_335.pdf (388,00 KB)
MD5: 33C363A70A64D5E14EE42C09F73183A5
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| Language: | English |
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| Work type: | Not categorized |
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| Typology: | 1.08 - Published Scientific Conference Contribution |
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| Organization: | UNG - University of Nova Gorica
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| Abstract: | We report for the first time on the measurement of the
correlation between the depth of shower maximum and the signal
in water-Cherenkov stations for events reconstructed by both
the fluorescence and the surface detectors of the Pierre Auger Observatory. Such a correlated measurement is a unique feature
of a hybrid air-shower observatory and allows us to determine
the purity of the cosmic-ray composition. The observed
correlation in the energy range around the “ankle”
lg(E/eV) = 18.5−19.0 differs significantly from the expectations for pure beams, indicating that the primary composition in this range is mixed, unless the
hadronic interactions at these energies behave very
differently than in conventional, LHC-tuned event generators. |
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| Keywords: | ultra-high energy cosmic rays, elemental composition, depth of shower maximum, secondary cosmic rays, Pierre Auger Observatory |
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| Publication status: | Published |
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| Year of publishing: | 2015 |
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| PID: | 20.500.12556/RUNG-2136  |
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| COBISS.SI-ID: | 4151035 |
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| NUK URN: | URN:SI:UNG:REP:517GG144 |
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| Publication date in RUNG: | 02.03.2016 |
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| Views: | 5252 |
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| Downloads: | 238 |
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