Abstract
We review the recent progress made in the computation of electromagnetic response functions in light and medium-mass nuclei using coupled-cluster theory. We show how a many-body formulation of the Lorentz integral transform method allows to calculate the photoabsorption cross sections of 16, 22O and 40Ca. Then, we discuss electromagnetic sum rules, with particular emphasis on the electric dipole polarizability, $ \alpha_D$. By including triples corrections in coupled-cluster theory, we revisit 48Ca, for which, beside the electric dipole polarizability, we had previously investigated the neutron and proton radii, as well as the size of the neutron-skin thickness (G. Hagen et al. Nat. Phys. 12, 186 (2016)). We show that correlations among these observables still hold, albeit a better agreement with experiment is obtained for $ \alpha_D$ and the prediction of a small neutron-skin thickness is further corroborated.
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