  We study the c-axis transport of stacked, intrinsic junctions in
Bi2Sr2CaCu2O8+y single crystals, fabricated by the double-sided ion beam
processing technique from single crystal whiskers. Measurements of the I-V
characteristics of these samples allow us to obtain the temperature and voltage
dependence of the quasiparticle c-axis conductivity in the superconducting
state, the Josephson critical current, and the superconducting gap. We show
that the BCS d-wave model in the clean limit for resonant impurity scattering
with a significant contribution from coherent interlayer tunneling, describes
satisfactorily the low temperature and low energy c-axis transport of both
quasiparticles and Cooper pairs.
