QUARK CONDENSATE IN THE NUCLEAR-MATTER

We calculate the quark condensate in the nuclear matter, taking into a ccount the single-pion and two-pion exchanges between nucleons. We fin d the dependence of the averaged value of the quark operator (q) over bar q on the density of the matter p. At very low density the nonlinea r terms are proportional to p(2) and increase the tendency to restorat ion of the chiral symmetry. At larger values of density the account of interaction inside the matter slower down the restoration of chiral s ymmetry compared to the gas approximation law. The leading nonlinear t erm in Fermi momentum power expansion becomes of the order p(4/3). The value of the condensate at the saturation value of density is obtaine d. The role of multinucleon effects is analyzed.