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The strong dependence of Coulomb energies on nuclear radii makes it possibleto extract the latter from calculations of the former. The resulting estimatesof neutron skins indicate that two mechanisms are involved. The firstone---isovector monopole polarizability---amounts to noting that when aparticle is added to a system it drives the radii of neutrons and protons indifferent directions, tending to equalize the radii of both fluidsindependently of the neutron excess. This mechanism is well understood and theDuflo-Zuker (small) neutron skin values derived 14 years ago are consistentwith recent measures and estimates. The alternative mechanism involves haloorbits whose huge sizes tend to make the neutron skins larger and have a subtleinfluence on the radial behavior of $sd$ and $pf$ shell nuclei. In particular,they account for the sudden rise in the isotope shifts of nuclei beyond $N=28$and the near constancy of radii in the $A=40-56$ region. This mechanism,detected here for the first time, is not well understood and may well go beyondEfimov physics usually associated to halo orbits.

Neutron Skins and Halo Orbits in the $sd$ and $pf$ shells