Mass composition of ultrahigh-energy cosmic rays with the Telescope Array Surface Detector data

0502252 - FZÚ 2020 RIV US eng J - Článek v odborném periodiku
Abbasi, R.U. - Abe, M. - Abu-Zayyad, T. - Urban, Federico … celkem 143 autorů
Mass composition of ultrahigh-energy cosmic rays with the Telescope Array Surface Detector data.
Physical Review D. Roč. 98, č. 2 (2019), s. 1-11, č. článku 022002. ISSN 2470-0010. E-ISSN 2470-0029
Grant CEP: GA MŠMT EF15_003/0000437
Grant ostatní: OP VVV - CoGraDS(XE) CZ.02.1.01/0.0/0.0/15_003/0000437
Institucionální podpora: RVO:68378271
Klíčová slova: ultra-high-energy cosmic arrays * telescope array * mass composition * boosted decision trees
Obor OECD: Particles and field physics
Impakt faktor: 4.833, rok: 2019
Způsob publikování: Omezený přístup
https://doi.org/10.1103/physrevd.99.022002

The results on ultrahigh-energy cosmic rays (UHECR) mass composition obtained with the Telescope Array surface detector are presented. The analysis employs 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 Monte-Carlo sets of events induced by the primary protons and iron. An average atomic mass of UHECR is presented for energies 1018.0 – 1020.0 eV. The average atomic mass of primary particles shows no significant energy dependence and corresponds to ⟨ln A⟩ = 2.0 ± 0.1(stat.) ± 0.44(syst.). The result is compared to the mass composition obtained by the Telescope Array with Xmax technique along with the results of other experiments. Possible systematic errors of the method are discussed.

Trvalý link: http://hdl.handle.net/11104/0294201