Abstract
We discuss the structural effects in the spin-orbit density part of the nucleus-nucleus potential, calculated within the framework of the Skyrme energy density formalism. The structural effects are analyzed by considering a two-nucleon transfer process in both the $\ensuremath{\alpha}$ and non-$\ensuremath{\alpha}$ colliding nuclei. We find that the spin-orbit density part of the nucleus-nucleus potential shows a preference for the $\ensuremath{\alpha}$-nuclei transfers in the $\ensuremath{\alpha}$ multiplier $(N=Z,A=4n)$ colliding nuclei, which diminishes for the non-$\ensuremath{\alpha}$ multiplier nuclei. Such $\ensuremath{\alpha}$-transfer effects are found to be related to the closure of the last j shell(s) of the product nucleus (nuclei), for both protons and neutrons. The interesting result is that this effect is shown to exist both for the number of valence particles and the weighted number of valence particles, called particle strength.
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