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Elastic scattering cross sections of the $^{89}$Y($\alpha$,$\alpha$)$^{89}$Yreaction have been measured at energies E$_{c.m.}$ = 15.51 and 18.63 MeV. Thehigh precision data for the semi-magic $N = 50$ nucleus $^{89}$Y are used toderive a local potential and to evaluate the predictions of global and regional$\alpha$-nucleus potentials. The variation of the elastic alpha scatteringcross sections along the $N = 50$ isotonic chain is investigated by a study ofthe ratios of angular distributions for $^{89}$Y($\alpha$,$\alpha$)$^{89}$Y and$^{92}$Mo($\alpha$,$\alpha$)$^{92}$Mo at E$_{c.m.} \approx$ 15.51 and 18.63MeV. This ratio is a very sensitive probe at energies close to the Coulombbarrier, where scattering data alone is usually not enough to characterize thedifferent potentials. Furthermore, $\alpha$-cluster states in $^{93}$Nb =$^{89}$Y $\otimes$ $\alpha$ are investigated.

High precision $^{89}$Y($\alpha$,$\alpha$)$^{89}$Y scattering at low energies