Charged-hadron suppression in Pb+Pb and Xe+Xe collisions measured with the ATLAS detector

The measurement of charged-hadron production in heavy-ion collisions provides insight into the properties of the quark-gluon plasma by measuring parton energy loss. The ATLAS detector at the LHC recorded 0.49nb$^{-1}$ of Pb+Pb collisions and 25pb$^{-1}$ of $pp$ collisions, both at the center-of-mass energy 5.02TeV. Recently, ATLAS also recorded 3$\mu$b$^{-1}$ of Xe+Xe collisions at the center-of-mass energy 5.44TeV, which provides a new opportunity to study the system-size dependence of the parton energy loss. The large acceptance of the ATLAS detector allows to measure the charged-hadron spectra in a wide range of pseudorapidity and transverse momentum, differentially in collision centrality. The nuclear modification factors $R_\mathrm{AA}$ are constructed as a ratio of the spectra measured in Pb+Pb or Xe+Xe collisions to that measured in \pp collisions, and are compared between each other.