The self-consistent random phase approximation (RPA) approach with the residual interaction derived from a relativistic pointcoupling energy functional is applied to evaluate the isospin symmetry-breaking corrections δ c for the 0 + → 0 + superallowed Fermi transitions. With these δ c values, together with the available experimental f t values and the improved radiative corrections, the unitarity of the Cabibbo-Kobayashi-Maskawa (CKM) matrix is examined. Even with the consideration of uncertainty, the sum of squared top-row elements has been shown to deviate from the unitarity condition by 0.1% for all the employed relativistic energy functionals.superallowed Fermi transition, random phase approximation, relativistic point-coupling energy functional, CabibboKobayashi-Maskawa matrix
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