Isospin structure of the dipole giant resonance

After introduction of formalism and definitions practical evaluations of quantities as isospin splitting energy of the giant resonance and differences on the neutron and proton radii. are given. The theory is parametrized with isoscalar, isovector and isotensor effective interactions cleaning up the origins and the meaning of these interactions. It is shown that isovector and isotensor energies emerges from a schematic model approach to the problem. (BJ)