Systematic examination of fusion for ${}^{39,41,45,47}\mathrm{K}+{}^{28}\mathrm{Si}$ and ${}^{36,44}\mathrm{Ar}+{}^{28}\mathrm{Si}$ provides insight into the impact of neutron and proton exchange on fusion for nuclei at and near the $N=20$ and $N=28$ shells. Comparison of the reduced excitation functions reveals a marked difference between the behavior of open-shell and closed-shell systems. While coupled channels calculations provide a good description for the closed-shell nuclei, they significantly underpredict the fusion cross section for open-shell nuclei. The observed trends are examined in the context of a potential energy surface, including shell effects, and multinucleon exchange with consideration of Pauli blocking.

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• Low & intermediate energy heavy-ion reactions
• Nuclear astrophysics
• Nuclear fusion
• Synthesis of new superheavy elements
• Transfer reactions
• Unstable nuclei induced nuclear reactions
• Optical, coupled-channel & distorted wave models