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Electric quadrupole (E2) matrix elements provide a measure of nucleardeformation and related collective structure. Ground-state quadrupole momentsin particular are known to high precision in many p-shell nuclei. While theexperimental electric quadrupole moment only measures the proton distribution,both proton and neutron quadrupole moments are needed to probe proton-neutronasymmetry in the nuclear deformation. We seek insight into the relation betweenthese moments through the ab initio no-core configuration interaction (NCCI),or no-core shell model (NCSM), approach. Converged ab initio calculations forquadrupole moments are particularly challenging, due to sensitivity tolong-range behavior of the wave functions. We therefore study morerobustly-converged ratios of quadrupole moments: across mirror nuclides, or ofproton and neutron quadrupole moments within the same nuclide. In calculationsfor mirror pairs in the p shell, we explore how well the predictions for mirrorquadrupole moments agree with experiment and how well isospin (mirror) symmetryholds for quadrupole moments across a mirror pair.

Quadrupole moments and proton-neutron structure in p-shell mirror nuclei