| Title: | Cosmic Ray Composition between 2 PeV and 2 EeV measured by the TALE Fluorescence Detector |
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| Authors: | ID AbuZayyad, T. (Author)
ID Lundquist, Jon Paul (Author), et al. |
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| Files: |  ICRC2021_346.pdf (960,82 KB)
MD5: F85C7329605BE0FF89DB6CC25C2008D2
 https://pos.sissa.it/395/346/
https://pos.sissa.it/395/346/pdf
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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: | The Telescope Array (TA) cosmic rays detector located in the State
of Utah in the United States is the largest ultra high energy cosmic rays
detector in the northern hemisphere. The Telescope Array Low Energy Extension
(TALE) fluorescence detector (FD) was added to TA in order to lower the
detector's energy threshold, and has succeeded in measuring the cosmic rays
energy spectrum down to PeV energies, by making use of the direct Cherenkov
light produced by air showers. In this contribution we present the results
of a measurement of the cosmic-ray composition using TALE FD data collected
over a period of ∼7 years. TALE FD data is used to measure the Xmax distributions of showers seen in the energy range of 10^15.3 - 10^18.3 eV. The data distributions are fit to Monte Carlo distributions of {H, He, N, Fe} cosmic-ray primaries for energies up to 10^18 eV. Mean Xmax values are measured for the full energy range. TALE observes a light composition at the "Knee", that gets gradually heavier as energy increases toward the "Second-Knee". An increase in the Xmax elongation rate is observed at energies just above 10^17.3 eV indicating a change in the cosmic rays composition from a heavier to a lighter mix of primaries. |
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| Keywords: | Telescope Array, TALE, low energy extension, indirect detection, fluorescence detection, cerenkov light, ultra-high energy, cosmic rays, composition |
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| Publication status: | Published |
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| Year of publishing: | 2022 |
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| PID: | 20.500.12556/RUNG-8491  |
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| COBISS.SI-ID: | 166495491 |
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| DOI: | 10.22323/1.395.0346 |
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| NUK URN: | URN:SI:UNG:REP:EZOVQFYZ |
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| Publication date in RUNG: | 02.10.2023 |
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| Views: | 1660 |
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| Downloads: | 6 |
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