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Abstract

Collinear laser spectroscopy is performed on the nickel isotopes ^58−68,70Ni, using a time-resolved photon counting system. From the measured isotope shifts, nuclear charge radii R_c are extracted and compared to theoretical results. Three ab initio approaches all employ, among others, the chiral interaction NNLO_sat, which allows an assessment of their accuracy. We find agreement with experiment in differential radii δ⟨r²_c⟩ for all employed ab initio methods and interactions, while the absolute radii are consistent with data only for NNLO_sat. Within nuclear density functional theory, the Skyrme functional SV-min matches experiment more closely than the Fayans functional Fy(Δr,HFB)