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Determination of the isotensor symmetry energy for the giant dipole resonance.

Comparison of giant dipole resonance energies measured in photonuclear reactions and in pion-induced double charge exchange allows determination of the isotensor component of the symmetry energy. Different models for the structure of the giant dipole and different assumptions for the mass dependence of the isotensor energy all produce the same qualitative results, with the isotensor energy about 1% of the isovector energy, and of the same sign.