Influence of complex configurations on properties of pygmy dipole resonance in neutron-rich Ca isotopes

Abstract

Starting from the quasiparticle random phase approximation based on the Skyrme interaction SLy5, we study the effects of phonon-phonon coupling~(PPC) on the low-energy electric dipole response in ${}^{40-58}$Ca. Using the same set of parameters we describe available experimental data for ${}^{40,44,48}$Ca and give prediction for ${}^{50-58}$Ca. The inclusion of the PPC results in the formation of low-energy $1^{-}$ states. There is an impact of the PPC effect on low-energy $E1$~strength of ${}^{40,44,48}$Ca. The PPC effect on the electric dipole polarizability is discussed. We predict a strong increase of the summed $E1$~strength below 10MeV, with increasing neutron number from ${}^{48}$Ca till ${}^{58}$Ca.

11 pages, 10 figures

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• Nuclear Equation of State from ground and collective excited state properties of nuclei
• Reference Database for Photon Strength Functions
• Electric dipole strength and dipole polarizability in ${}^{48}$Ca within a fully self-consistent second random-phase approximation
• Microscopic Description of Isoscalar Giant Monopole Resonance in ${}^{48}$Ca
• Pygmy resonances: what's in a name?
• Microscopic description of the pygmy dipole resonance in neutron-rich Ca isotopes
• Fine structure of the isoscalar giant monopole resonance in ${}^{48}$Ca