  We present an update on recent theoretical studies of electromagnetic
reactions obtained by using the Lorentz integral transform method. The 4He
nucleus will be the main focus of this report: results for the
photo-disintegration and the electro-disintegration processes will be shown, as
well as a recent calculation of polarizability effects in muonic atoms. We also
discuss the exciting possibility to investigate inelastic reactions for
medium-mass nuclei in coupled-cluster theory, highlighted by the recent
application to the 16O photo-nuclear cross section.
