Account of Non-Nucleonic Degrees of Freedom in Nuclear Matter

A two-component formalism has been developed for the reaction matrix in a nuclear medium in the case of nucleon–nucleon interaction taking into account additional non-nucleonic degrees of freedom. The approach is based on the dibaryon model of nucleon–nucleon interactions, which recently allowed description of partial \(NN\) scattering amplitudes for the channels with total angular momentum \(J\leq 3\) in a wide energy range from zero to 0.6–1 GeV, and also to successfully reproduce the positions of the known dibaryon resonances for a number of channels. The bound states in the nuclear medium that arise for such a model have been studied. An equation of state for symmetric nuclear matter has been calculated within the framework of the Brueckner–Hartree–Fock scheme.