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The sub-barrier capture (fusion) reactions $^{32}$S+$^{90,94,96}$Zr,$^{36}$S+$^{90,96}$Zr, $^{40}$Ca+$^{90,94,96}$Zr, and $^{48}$Ca+$^{90,96}$Zrwith positive and negative $Q$-values for neutron transfer are studied withinthe quantum diffusion approach and the universal fusion functionrepresentation. For these systems, the s-wave capture probabilities areextracted from the experimental excitation functions and are also analyzed.Different effects of the positive $Q_{xn}$-value neutron transfer in the fusionenhancement are revealed in the relatively close reactions$^{32}$S+$^{94,96}$Zr and $^{40}$Ca+$^{94,96}$Zr.

Why does neutron transfer play different roles in sub-barrier fusion reactions $^{32}$S+$^{94,96}$Zr and $^{40}$Ca+$^{94,96}$Zr?