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Low-energy dipole excitations have been investigated theoretically in N=50,several N=82 isotones and the Z=50 Sn isotopes. For this purpose a methodincorporating both HFB and multi-phonon QPM theory is applied. A concentrationof one-phonon dipole strength located below the neutron emission threshold hasbeen calculated in these nuclei. The analysis of the corresponding neutron andproton dipole transition densities allows to assign a genuine pattern to thelow-energy excitations and making them distinct from the conventional GDRmodes. Analyzing also the QRPA wave functions of the states we can identifythese excitations as Pygmy Dipole Resonance (PDR) modes, recently studied alsoin Sn and N=82 nuclei. The results for N=50 are exploratory for an experimentalproject designed for the bremsstrahlung facility at the ELBE accelerator.

Low-energy Dipole Excitations in Nuclei at the N=50,82 and Z=50 Shell Closures as Signatures for a Neutron Skin