  We investigate the isospin transport with 40,48 Ca+ 40,48 Ca reactions at 35
MeV/nucleon, measured with the coupling of the VAMOS high acceptance
spectrometer and the INDRA charged particle multidetector. Using the
quasi-projectile remnant measured with VAMOS and carefully selected
light-charged-particles measured in coincidence with INDRA, a reconstruction
method is applied to estimate the excited quasi-projectile (QP) on an
event-by-event basis. The isospin diffusion is investigated using the isospin
transport ratio with the asymmetry $\delta$ = (N -- Z)/A of the projectile as
an isospin-sensitive observable and the total transverse energy of Z $\le$ 2
nuclei for experimental centrality sorting. The experimental isospin transport
ratios present, for both the reconstructed QP and its remnant, a clear
evolution towards isospin equilibration with increasing dissipation of the
collision while the full equilibration is not reached. A smoother evolution
with less discrepancies between the two mixed systems in the case of the
reconstructed QP is also observed. The isospin migration is investigated using
the neutron-to-proton ratio of the light-charged-clusters and the velocity of
the QP remnant as a sorting parameter. More particularly, we focused on an
angular region centered around the mid-rapidity of the reaction so as to
characterize the low-density neck emissions. A systematic neutron-enrichment is
observed and interpreted as a consequence of isospin migration, more
particularly for the symmetric systems which present no isospin gradient
between the projectile and the target. We also noticed that the ^{2}H and
^{4}He particles exhibit very close multiplicities independently of the sorting
variable for the symmetric systems.
