THE NUCLEON-NUCLEON INTERACTION IN TERMS OF QUARK DEGREES OF FREEDOM

A modified quark-quark interaction is applied to study the nucleon-nuc leon interaction. The quark potential is suggested by instanton models and includes pion (pi) and sigma (sigma) exchanges as non-perturbativ e components and the one-gluon exchange as a perturbative one. The nuc leon-nucleon potential derived from this model presents short-range re pulsion and medium-range attraction besides the usual pion tail. Using this interaction the nucleon-nucleon phase shifts within the resonati ng group method have been calculated. They agree reasonably well with experimental values.