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The results on ultra-high energy cosmic rays’ chemical composition based on the data from the Telescope Array surface detector are reported. The analysis is based the boosted decision tree (BDT) multivariate analysis built upon 14 observables related to both the properties of the shower front and the lateral distribution function. The multivariate classifier is trained with MonteCarlo sets: proton-induced, which is considered as background events, and ironinduced, considered as signal events. The classifier results in a single variable ξ for data and Monte-Carlo sets, available for one-dimensional analysis. The data to Monte-Carlo comparison results in an average atomic mass of UHECR for energy range 1018.0 − 1020.0 eV. The average atomic mass of primary particles corresponds to 〈ln A〉 = 1.52±0.08(stat.)±0.1(syst.). The comparison with TA hybrid composition results and the other experiments is presented.

Ultra-high-energy cosmic rays mass composition studies with the Telescope Array Surface Detector data