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Magnetic excitations in nuclei with neutron excess

The excitation of the 1 + , 2 and 3 + modes in 16 O, 22 O, 24 O, 28 O, 40 Ca, 48 Ca, 52 Ca and 60 Ca nuclei is studied with self-consistent random phase approximation calculations. Finite-range interactions of Gogny type, containing also tensor-isospin terms, are used. We analyze the evolution of the magnetic resonances with the increasing number of neutrons, the relevance of collective effects, the need of a correct treatment of the continuum and the role of the tensor force.