  The paper considers the chains of successive electron capture reactions by
nuclei of the iron group which take place in the crystal structures of neutron
star envelopes. It is shown that as a result of such reactions the daughter
nuclei in excited states accumulate within certain layers of neutron star
crusts. The phonon model of interactions is proposed between the excited nuclei
in the crystalline structure, as well as formation of highly excited nuclear
states which emit neutrons and higher energy photons.
