Abstract
The so-called Pygmy Dipole Resonance, an additional structure of low-lying electric dipole strength, has attracted strong interest in the last years. Different experimental approaches have been used in the last decade in order to investigate this new interesting nuclear excitation mode. In this contribution an overview on the available experimental data is given.
Highlights
In atomic nuclei nearly the complete electric dipole (E1) strength is concentrated in the well-known Isovector Electric Dipole Giant Resonance (IVGDR)
In many nuclei additional strength is experimentally found well below the IVGDR, which is mostly denoted as Pygmy Dipole Resonance (PDR) or Pygmy Dipole Strength
The strength located in the PDR is usually on the order of a percent of the IVGDR, while the centroid energy is in the vicinity of the particle emission thresholds
Summary
Deniz Savran1,2,a 1ExtreMe Matter Institute EMMI and Research Division, GSI Helmholtzzentrum für Schwerionenforschung, Planckstr. 1, 64291 Darmstadt, Germany 2Frankfurt Institute for Advanced Studies FIAS, Ruth-Moufang-Str. 1, 60438 Frankfurt am Main, Germany
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