2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/81868Entrance-channel potentials in nucleus-nucleus collisions, relevant for the synthesis of superheavy elements, are systematically studied within a semi-microscopic approach, where microscopic nuclear densities of the colliding spherical or deformed nuclei are used in semi-classical expressions of the energy-density functional. From experimental data on fusion windows evidence is found that the existence of pockets in the entrance-channel potentials is crucial for fusion. Criteria for the choice of best collision systems for the synthesis of superheavy elements are discussed.15 pages, 8 figures. Accepted for publication in Eur. Phys. J. A. In LaTeX file Springer-Verlag and AMS styles are usedNuclear Theorytext