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We report a systematic study on the electronic structure and superconducting(SC) gaps in electron doped NaFe$_{0.95}$Co$_{0.05}$As superconductor usingangle-resolved photoemission spectroscopy. Hole-like Fermi sheets are at thezone center and electron-like Fermi sheets are at the zone corner, and aremainly contributed by $xz$ and $yz$ orbital characters. Our results reveal a$\frac{\Delta}{K_B T_c}$ in the range of 1.8-2.1, suggesting a weak-couplingsuperconductivity in these compounds. Gap closing above the transitiontemperature ($T_c$) shows the absence of pseudogaps. Gap evolution withtemperature follow the BCS gap equation near the $\Gamma$, $Z$, and $M$ highsymmetry points. Furthermore, an almost isotropic superconductivity along $k_z$direction in the momentum space is observed by varying the excitation energies.

A weak-coupling superconductivity in the electron doped NaFe$_{0.95}$Co$_{0.05}$As is revealed by ARPES