Abstract
For the first time, this study investigated an energy region that covers both the Pygmy Dipole Resonance (PDR) and the Giant Dipole Resonance (GDR) for a broad set of even-even erbium isotopes. More specifically, translational and Galilean invariant (TGI-) quasiparticle random phase approximation (QRPA) was applied to investigate eight even-even 156–170Er isotopes. Through cross-section calculations, we obtained information about the structure of the GDR and PDR modes, as well as the splitting between the K = 0 and K = 1 branches. The PDR region was explored in more detail by investigating the region up to both 8 MeV and 10 MeV to determine the main distribution area of the PDR. It was found that only the E1 strengths below 8 MeV matched well with the well-known systematics of the PDR.
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