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The effect of atomic disorder induced by neutron irradiation on the crystalstructure and electronic states near $E_F$ of the lightly overdopedLaFeAsO$_{0.85}$F$_{0.15}$ ($T_c=21K$) was studied by X-ray diffraction and$^{75}$As NMR. The irradiation of the polycrystalline sample by "moderate"neutron fluence of $\Phi=(0;0.5;1.6)\cdot10^{19}cm^{-2}$ at $T=50^{\circ}C$leads to the suppression of superconductivity. It is shown that neutronirradiation produces an anisotropic expansion of the tetragonal lattice almostdue to an increase of the Fe-As distance. A partial loss of the 2D character ofthe FeAs layer is accompanied with a suppression of the gap-like feature intemperature dependence of the spin susceptibility. In the most disordered statethe $^{75}$As spin-lattice relaxation rate follows the Korringa law$^{75}T_1^{-1} \sim T$, the thermal behavior being typical for an isotropicmotion of the conducting electrons.

Structural and electronic properties of LaFeAsO$_{0.85}$F$_{0.15}$ superconductor modified under neutron irradiation