TA 10 Year Stereo Composition Measurement
2019
The nuclear composition of primary
ultra-high-energy cosmic rays(UHECRs) can be inferred from the observed distribution of depths of
showermaximum (\(X_{\rm max}\)) of the induced extensive
air showers. The observed Xmax distributions at various
primary energiescan be compared with the distributions predicted by detailed detector simulations for any assumed primary particle type and high-energy hadronic
interaction model. In this paper, we present measurements of \(X_{\rm max}\) by the Telescope Array (TA) fluorescence detectors with stereoscopic
showerreconstruction using 10 years of data. We find that for all hadronic models considered, the data collected is consistent with a chiefly light UHECR composition.
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Correction
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