Abstract
The measurement of the excitation function for fusion evaporation reactions in the system $^{40}\mathrm{Ca}+^{48}\mathrm{Ca}$ ($Q=$ 4.56 MeV) has been extended downward by two orders of magnitude with respect to previous cross section data. A first indication of an $S$-factor maximum in a system with a positive $Q$ value has been observed. In addition a correlation between fusion hindrance and neutron excess $N\ensuremath{-}Z$ has been found for the Ca $+$ Ca, Ni $+$ Ni, and Ca $+$ Zr systems.
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