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The pygmy-dipole resonances and photon strength functions in stable andunstable Ni and Sn isotopes are calculated within the microscopicself-consistent version of the extended theory of finite fermi systems whichincludes the QRPA and phonon coupling effects and uses the known Skyrme forcesSLy4. The pygmy dipole resonance in $^{72}Ni$ is predicted with the mean energyof 12.4 MeV and the energy-weighted sum rule exhausting 25.6\% of the totalstrength. The microscopically obtained photon E1 strength functions are used tocalculate nuclear reaction properties, i.e the radiative neutron capture crosssection, gamma-ray spectra, and average radiative widths. Our main conclusionis that in all these quantities it is necessary to take the phonon couplingeffects into account.

Microscopic nature of the photon strength function: stable and unstable Ni and Sn isotopes