Halo Phenomena in Light to Medium Mass Nuclei with Three-Body Models

Short-lived nuclear systems with light to medium masses are showing halo phenomena in regions of the nuclear chart that where still unexplored when halo nuclei were discovered 40 years ago. We study these exotic systems with three-body models including nucleon-nucleon correlations with the aim of reproducing measurable properties like radii and electromagnetic transitions strengths.\\ \noindent On the nuclear-rich side, drip-line fluorine isotopes are showing clear signs of a halo structure \cite{Fort20,Casa20,JSin20}: recently we proposed that $^{29}$F is a moderate two-neutron halo nucleus with a large radius and a strong B(E1) response to the continuum. The three-body model place it at the borders of the island of inversion and this is corroborated by new data. According to our models, the next interesting isotope, $^{31}$F, also has large spatial extension due to p-wave components and enhanced B(E1) response, pointing to a speculative halo structure \cite{GSin22}.\\ \noindent On the proton-rich side, we have studied the $^{102}$Sb system, as composed of a $^{100}$Sn core plus a proton-neutron correlated subsystem \cite{Oish25}. We find that the weakening of the proton-neutron correlations with respect to the bare deuteron indicates that this is a one-proton emitter. We have proposed that the presence of resonant state and its decay might provide a crucial benchmark for this system.