In this paper we have studied role of pionic contribution in the structure function and the EMC effect for 27 Al, 56 Fe, 63 Cu and, 107 Ag nuclei. For extracting nuclear structure function, first we calculated contribution of the Fermi motion, and the binding energy effects and, then, we added pionic contribution to them. Also, we used the free GRV nucleon structure functions in the conventional nuclear theory. Extracted results show that using the pionic contribution in these nuclei structure function and the EMC effect give good agreement with experimental data.
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