Influence of Nuclear Structure on Sub-Barrier Hindrance in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="normal">N</mml:mi><mml:mi mathvariant="normal">i</mml:mi><mml:mo>+</mml:mo><mml:mi mathvariant="normal">N</mml:mi><mml:mi mathvariant="normal">i</mml:mi></mml:math>Fusion

Fusion-evaporation cross sections for $^{64}\mathrm{N}\mathrm{i}+^{64}\mathrm{N}\mathrm{i}$ have been measured down to the 10 nb level. For fusion between two open-shell nuclei, this is the first observation of a maximum in the $S$-factor, which signals a strong sub-barrier hindrance. A comparison with the $^{58}\mathrm{N}\mathrm{i}+^{58}\mathrm{N}\mathrm{i}$, $^{58}\mathrm{N}\mathrm{i}+^{60}\mathrm{N}\mathrm{i}$, and $^{58}\mathrm{N}\mathrm{i}+^{64}\mathrm{N}\mathrm{i}$ systems indicates a strong dependence of the energy where the hindrance occurs on the stiffness of the interacting nuclei.

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