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The SU(2) gluonic correlation functions, glueball effective masses in the$J^{P}=0^{+}$, $2^{+}$ and $0^{-}$ channels were calculated from the latticeclassical gauge configurations which were obtained by smoothing the thermalgauge configurations through the improved cooling method. The instanton-inducedattractive force in the $0^{+}$ channel and the repulsive force in the $0^-$channel are confirmed in the Monte Carlo simulation. There is evidence that theinstanton vacuum contribution to the $0^+$ glueball mass is significant.Comment: LaTeX, 9 pages, Proceedings of the International Workshop on  Nonperturbative Methods and Lattice QCD, Guangzhou, Chin

GLUONS IN THE LATTICE SU(2) CLASSICAL GAUGE FIELD