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In the theory of the finite fermi-systems [1], it was shown that giantresonances in nuclei can be consider as the zero-sound excitations whichexhaust the large part of the energy-weighted sum rules. In the framework of[1] the solutions of the zero-sound dispersion equation in the symmetricnuclear matter, \omega_s(k), are considered. The method of calculation of thesesolutions is based on the analytical structure of the polarization operators\Pi(\omega,k). The solutions of the dispersion equation, which are real atsmall k, become complex with k increasing when the overlapping of thecollective and 1p1h modes starts. The imaginary part of \omega_s(k) is theresult of the collective zero-sound excitation decay to the real particle-holepairs and can be compared with the escape width of resonances. We compare theexperimental energy and escape width of the giant dipole resonance (GDR) in thenucleus A with Re\omega_s(k) and Im\omega_s(k) taken at a definite wave vectork=k_A.

Evaluation of the escape widths of the giant dipole resonances in the fermi-liquid theory