Indications of a shallow potential in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">Ca</mml:mi><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>48</mml:mn></mml:mrow></mml:mmultiscripts><mml:mrow><mml:mo>+</mml:mo></mml:mrow><mml:mmultiscripts><mml:mi mathvariant="normal">Zr</mml:mi><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>96</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>fusion reactions

Fusion data for $^{48}\mathrm{Ca}+^{96}\mathrm{Zr}$ are analyzed by coupled-channels calculations. Puzzling features of a previous analysis are eliminated by applying a potential that has a shallow pocket in the entrance channel. Thus the observed $S$ factor for fusion, which develops a maximum at low energy, can be reproduced fairly well. The high-energy data can also be accounted for but that requires the use of a weak, short-ranged imaginary potential that absorbs the incoming flux near the location of the minimum of the potential pocket. Predictions of the fusion hindrance in other $\mathrm{Ca}+\mathrm{Zr}$ systems are made and are compared with the systematics that has been developed previously.

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