  We study the behavior of the fusion, break-up, reaction and elastic
scattering of different projectiles on $^{64}$Zn, at near and above barrier
energies. We present fusion and elastic scattering data with the tightly bound
$^{16}$O and the stable weakly bound $^{6}$Li, $^{7}$Li and $^{9}$Be
projectiles. The data were analyzed by coupled channel calculations. The total
fusion cross sections for these systems are not affected by the break-up
process at energies above the barrier. The elastic (non-capture) break-up cross
section is important at energies close and above the Coulomb barrier and
increases the reaction cross sections. In addition we also show that the
break-up process at near and sub-barrier energies is responsible for the
vanishing of the usual threshold anomaly of the optical potential and give rise
to a new type of anomaly.
