Neutron skin and signature of the $N$ = 14 shell gap found from measured proton radii of ${}^{17-22}$N

Abstract

A thick neutron skin emerges from the first determination of root mean square radii of the proton distributions for ${}^{17-22}$N from charge changing cross section measurements around 900$A$ MeV at GSI. Neutron halo effects are signaled for ${}^{22}$N from an increase in the proton and matter radii. The radii suggest an unconventional shell gap at $N$ = 14 arising from the attractive proton-neutron tensor interaction, in good agreement with shell model calculations. $Ab$ $initio$, in-medium similarity re-normalization group, calculations with a state-of-the-art chiral nucleon-nucleon and three-nucleon interaction reproduce well the data approaching the neutron drip-line isotopes but are challenged in explaining the complete isotopic trend of the radii.

18 pages, 3 figures

References in corpus (7)

• Accurate nuclear radii and binding energies from a chiral interaction
• A nucleus-dependent valence-space approach to nuclear structure
• Coupled-cluster theory for three-body Hamiltonians
• Shell-model study of boron, carbon, nitrogen and oxygen isotopes based on monopole-based-universal interaction
• Proton distribution radii of ${}^{12-19}$C illuminate features of neutron halos
• Effects of three-nucleon forces and two-body currents on Gamow-Teller strengths
• Ab initio coupled-cluster theory for open-shell nuclei

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