Abstract
High resolution photon scattering experiments were performed at the 10
MeV bremsstrahlung facility of the electron accelerator S-DALINAC at TU
Darmstadt to investigate the semi-magic N = 82 nuclei Ba-138. Ce-140,
Nd-142 and Sm-144. Energies and absolute strengths of dipole transitions
below 10 MeV were determined in a model independent way. A concentration
of electric dipole excitations exhausting up to 1\% of the isovector El
energy weighted sum rule is observed in all four nuclei around 6.5 MeV.
Calculations in the framework of the Quasiparticle-Phonon Model (QPM)
reproduce the gross experimental features. (c) 2006 Elsevier B.V. All
rights reserved.
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