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The dynamics of isolated-photon plus one-, two- and three-jet production in$pp$ collisions at a centre-of-mass energy of 8 TeV are studied with the ATLASdetector at the LHC using a data set with an integrated luminosity of 20.2fb$^{-1}$. Measurements of isolated-photon plus jets cross sections arepresented as functions of the photon and jet transverse momenta. The crosssections as functions of the azimuthal angle between the photon and the jets,the azimuthal angle between the jets, the photon-jet invariant mass and thescattering angle in the photon-jet centre-of-mass system are presented. Thepattern of QCD radiation around the photon and the leading jet is investigatedby measuring jet production in an annular region centred on each object;enhancements are observed around the leading jet with respect to the photon inthe directions towards the beams. The experimental measurements are compared toseveral different theoretical calculations, and overall a good description ofthe data is found.

High-$E_{\rm T}$ isolated-photon plus jets production in $pp$ collisions at $\sqrt s=$ 8 TeV with the ATLAS detector