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We report the detection of the 3P1 to 3P0 fine-structure line of neutralcarbon in the z=4.12 quasar PSS 2322+1944, obtained at the IRAM Plateau de Bureinterferometer. The CI 3P1-3P0 line is detected with a signal-to-noise ratio ofabout 6 with a peak intensity of about 2.5 mJy and a velocity-integrated lineflux of 0.81+-0.12 Jy.km/s. Assuming an excitation temperature of 43 K (equalto the dust temperature), we derive a mass of neutral carbon (corrected formagnification) of about 1.2e7 Msun. In PSS 2322+1944, the cooling due to C isabout 6 times smaller than for CO, whereas the CO and C cooling representsabout 1e-4 of the far-infrared continuum and more than half of the cooling dueto C+.Comment: 4 pages, 2 PostScript figures. Accepted for publication as a letter  in Astronomy & Astrophysics. Uses aa LaTeX macro

Atomic carbon in PSS 2322+1944, a quasar at redshift $\mathsf{4.12}$