Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2009-01-16
Physics
Nuclear Physics
Nuclear Experiment
submitted to Phys. Lett. B
Scientific paper
The $^{112,120}$Sn$(\gamma,\gamma')$ reactions have been studied at the S-DALINAC. Electric dipole (E1) strength distributions have been determined including contributions from unresolved strength extracted by a fluctuation analysis. Together with available data on $^{116,124}$Sn, an experimental systematics of the pygmy dipole resonance (PDR) in stable even-mass tin isotopes is established. The PDR centroid excitation energies and summed strengths are in reasonable agreement with quasiparticle-phonon model calculations based on a nonrelativistic description of the mean field but disagree with relativistic quasiparticle random-phase approximation predictions.
Enders Joerg
Lenske Horst
Özel B.
Poltoratska I.
Ponomarev Yu. V.
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