Sub-barrier fusion of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">Ni</mml:mi></mml:mrow><mml:mprescripts/><mml:mrow/><mml:mrow><mml:mn>5</mml:mn><mml:mn>8</mml:mn><mml:mo>,</mml:mo><mml:mn>6</mml:mn><mml:mn>4</mml:mn></mml:mrow><mml:mrow/><mml:mrow/></mml:mmultiscripts></mml:mrow></mml:math>with<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">Ni</mml:mi></mml:mrow><mml:mprescripts/><mml:mrow/><mml:mrow><mml:mn>64</mml:mn></mml:mrow><mml:mrow/><mml:mrow/></mml:mmultiscripts></mml:mrow></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">Ge</mml:mi></mml:mrow><mml:mprescripts/><mml:mrow/><mml:mrow><mml:mn>74</mml:mn></mml:mrow><mml:mrow/><mml:mrow/></mml:mmultiscripts></mml:mrow></mml:math>

Differential cross sections for evaporation residue formation following complete fusion of $^{64}\mathrm{Ni}$ and $^{74}\mathrm{Ge}$ with 171 to 215 MeV $^{58}\mathrm{Ni}$ and $^{64}\mathrm{Ni}$ ions were measured with high precision using a velocity selector together with a counter telescope. The resulting excitation functions for complete fusion ranged in magnitude from 10 \ensuremath{\mu}b to 300 mb. The excitation functions exhibited a strong response, at sub-barrier energies, to changes in the underlying nuclear structure. We interpreted these variations as evidence that the fusion proceeds through dynamic single-particle/softness-related processes. A phenomenological analysis was performed. In the analysis, we employed the Wentzel-Kramers-Brillouin method, constructed a simple interaction potential and introduced a radially-dependent effective mass. The use of the variable effective mass led to a meaningful description of our above-barrier data and to improvements towards describing our sub-barrier data.NUCLEAR REACTIONS Complete fusion, $^{58}\mathrm{Ni}$ + $^{64}\mathrm{Ni}$, $^{58}\mathrm{Ni}$ + $^{74}\mathrm{Ge}$, $^{64}\mathrm{Ni}$ + $^{58}\mathrm{Ni}$, $^{64}\mathrm{Ni}$ + $^{64}\mathrm{Ni}$, $^{64}\mathrm{Ni}$ + $^{74}\mathrm{Ge}$, $E=171 \mathrm{to}215$ MeV (lab), measured $\ensuremath{\sigma} (E,\ensuremath{\theta})$ for evaporation residues; observed dynamic, single-particle/softness effects; performed barrier-penetration analysis.

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