[en] Two heavy-ion experiments are reported which both use a magnetic spectrometer. The equipment of the focal plane of the magnet is based on the use of a set of gaz counters which are described. A method for the reconstitution of trajectories is given. The aim of the experiments is to reach a deeper knowledge of the reaction mechanism in the case of a heavy ion induced α transfer reaction. Correlation experiments are performed in order to measure the polarization of the residual nucleus. The other experiment is done in order to measure the mass excess of some light exotic nuclei and the excitation energy of their first excited state by relative Q-value measurements