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 40-58Ca. Using the same set of parameters we describe available experimental data for 40,44,48Ca and give prediction for 50-58Ca. 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 40,44,48Ca. 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 48Ca till 58Ca.
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