  We report on the 13C spin-lattice relaxation times in polycristalline
fullerite C60 measured over the temperature range 295 K to 1000 K. At
temperatures above 470 K, spin-lattice relaxation is dominated by the
spin-rotation interaction. From the analysis of temperature dependence of
T1(13C), the spin-rotation constant is determined using J- and M-models of
rotational diffusion: C(J)=-51 Hz, C(M)=-29 Hz.
