  We report low-temperature measurements of the electrical transport properties
of few-atom contacts of the superconducting metal zinc, arranged with
lithographically fabricated mechanically controllable breakjunctions (MCB). The
conductance histogram shows several narrow peaks, not regularly observed for
multivalent metals. The first peak - corresponding to the single-atom contact -
is located slightly below one conductance quantum and is split into two
subpeaks, possibly indicating two preferred configurations of the single-atom
contact. The current-voltage characteristics in the superconducting state show
nonlinearities due to multiple Andreev reflections (MAR). In addition we find
nonlinearities in the current-voltage characteristics that we attribute to
electronic-interaction effects due to the granular structure of the film.
  Some of these latter findings are in qualitative agreement with a prediction
by Avishai et al. A. Avishai, A. Golub, A. D. Zaikin, Europhys. Lett. {\bf 54},
640.
