Robust ab initio prediction of nuclear electric quadrupole observables by scaling to the charge radius

Abstract

Meaningful predictions for electric quadrupole (E2) observables from ab initio nuclear theory are necessary, if the ab initio description of collective correlations is to be confronted with experiment, as well as to provide predictive power for unknown E2 observables. However, converged results for E2 observables are notoriously challenging to obtain in ab initio no-core configuration interaction (NCCI) approaches. Matrix elements of the E2 operator are sensitive to the large-distance tails of the nuclear wave function, which converge slowly in an oscillator basis expansion. Similar convergence challenges beset ab initio prediction of the nuclear charge radius. We demonstrate that the convergence patterns of the E2 and radius observables are strongly correlated, and that meaningful predictions for the absolute scale of E2 observables may be made by calibrating to the experimentally-known ground-state charge radius. We illustrate by providing robust ab initio predictions for several E2 transition strengths and quadrupole moments in p-shell nuclei, in cases where experimental results are available for comparison.

7 pages, 3 figures

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• Probing the quadrupole transition strength of 15C via deuteron inelastic scattering
• Perspectives on few-body cluster structures in exotic nuclei
• Quadrupole dynamics of carbon isotopes and 10Be
• Alpha-Particle Monopole Form Factors with Ab Initio No-Core Shell Model
• Robust ab initio predictions for dimensionless ratios of E2 and radius observables. II. Estimation of E2 transition strengths by calibration to the charge radius
• Robust ab initio predictions for dimensionless ratios of E2 and radius observables. I. Electric quadrupole moments and deformation
• Uncertainties in tellurium-based dark matter searches stemming from nuclear structure uncertainties