  We calculate the single-particle nucleon characteristics in symmetric nuclear
matter with inclusion of the 3N interactions. The contribution of the 3N forces
to the nucleon self energies are expressed in terms of the nonlocal scalar
condensate (d=3) and of the configuration of the two four-quark condensates
(d=6) in which two diquark operators act on two different nucleons of the
matter. The most important part of the contribution of the four-quark
condensate is calculated in a model-independent way. We employed a relativistic
quark model of nucleon for calculation of the rest part. The density dependence
of the vector and scalar nucleon self energies and of the single-particle
potential energy are obtained.
