  The semi-magic nuclei Ba-138, Ce-140, and Sm-144 have been investigated in
photon scattering experiments up to an excitation energy of about 10 MeV. The
distribution of the electric dipole strength shows a resonance like structure
at energies between 5.5 and 8 MeV exhausting up to 1% of the isovector E1
Energy Weighted Sum Rule.
