A method to describe the observables in the nucleon charge-exchange reactions on nuclei at intermediate energies with the explicit inclusion of the pion and rho-meson exchange and an excitation of the intermediate Δ (1232) isobar is proposed. The A(p,n)B reaction may be imagined as A(p,n)A+π reaction with the pion four-momentum equal to (m_π,0). This allows one to use the findings of the pion production/absorption theory in a combination with a standard distorted wave formalism for the description of the reaction observables. The corrections on the nuclear medium and short-range correlations are included. The calculations are compared with the experimental cross section of the ~7Li(p, n)~7Be reaction at T_P = 200 MeV and a satisfactory agreement is obtained.
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