  The fragment separator FRS has been for the first time used to measure the
(n,p) and (p,n)-type isobaric charge-exchange cross sections of stable
112,124Sn isotopes accelerated at 1A GeV with an uncertainty of 3% and to
separate quasi-elastic and inelastic components in the missing-energy spectra
of the ejectiles. The inelastic contribution can be associated to the
excitation of isobar {\Delta}(1232) resonances and to the pion emission in
s-wave, both in the target and projectile nuclei, while the quasi-elastic
contribution is associated to the nuclear spin-isospin response of nucleon-hole
excitations. The data lead to interesting results where we observe a clear
quenching of the quasi-elastic component and their comparisons to theoretical
calculations demonstrate that the baryonic resonances can be excited in the
target and projectile nuclei. To go further in this investigation, we propose
to study the excitation of baryonic resonances taking advantage of the
combination of high-resolving power magnetic spectrometers with the WASA
calorimeter. These new measurements will allow us to determine the momenta of
the ejectiles and pions emitted in coincidence after the single isobaric
charge-exchange collisions, providing us unique opportunities to study the
evolution of the baryonic resonance dynamics with the neutron-proton asymmetry
through the use of exotic radioactive ion beams.
