The structure of the radioactive beams is investigated using the simplest
possible probe~: the proton used as a target in inverse kinematic reactions.
From (p,p\') reactions, information on the neutron and proton transition densities
is obtained through the comparison between the measured inelastic
cross sections to the ones calculated using a microscopic potential and
theoretical densities. (p,p\') inelastic scattering data
to the first excited state
for the halo nucleus $^6$He and for other nuclei $^{34}$Ar
and $^{34,36}$S have been measured at GANIL using the MUST telescopes.
This allows to extract the global features of the transition densities, as shown
for the halo nucleus $^6$He. We can also probe
the evolution of the shell structure along isotopic chains
as moving towards the neutron or proton drip-lines.
The example of the sulfur isotopic chain is discussed.
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