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The low-lying electric dipole (E1) strength in the semi-magic nucleus 136Xehas been measured which finalizes the systematic survey to investigate theso-called pygmy dipole resonance (PDR) in all stable even N=82 isotones withthe method of nuclear resonance fluorescence using real photons in the entrancechannel. In all cases, a fragmented resonance-like structure of E1 strength isobserved in the energy region 5 MeV to 8 MeV. An analysis of the fragmentationof the strength reveals that the degree of fragmentation decreases towards theproton-deficient isotones while the total integrated strength increasesindicating a dependence of the total strength on the neutron-to-proton ratio.The experimental results are compared to microscopic calculations within thequasi-particle phonon model (QPM). The calculation includes complexconfigurations of up to three phonons and is able to reproduce also thefragmentation of the E1 strength which allows to draw conclusions on thedamping of the PDR. Calculations and experimental data are in good agreement inthe degree of fragmentation and also in the integrated strength if thesensitivity limit of the experiments is taken into account.

Fragmentation and systematics of the Pygmy Dipole Resonance in the stable N=82 isotones