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Proton distribution radii of $^{16-24}$O: signatures of new shell closures and neutron skin
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abstract
The root mean square radii of the proton density distribution in $^{16-24}$O derived from measurements of charge changing cross sections with a carbon target at $\sim$900$A$ MeV together with the matter radii portray thick neutron skin for $^{22 - 24}$O despite $^{22,24}$O being doubly magic. Imprints of the shell closures at $N$ = 14 and 16 are reflected in local minima of their proton radii that provide evidence for the tensor interaction causing them. The radii agree with it ab initio calculations employing the chiral NNLO$_{\mathrm{sat}}$ interaction, though skin thickness predictions are challenged. Shell model predictions agree well with the data.
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Radii of light nuclei from the Jacobi No-Core Shell Model
A density-tail repair method yields converged matter and charge radii for 4,6,8He and 6,7,8Li from Jacobi no-core shell model calculations with chiral forces.
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