Atomic mass relations of mirror nuclei

This is the authors' abstract. We don't add key points for this paper.

In this paper we study the mass relation of mirror nuclei with our focus on pairing and shell effects in the Coulomb energy. We present an accurate mass formula for neutron-deficient nuclei with mass number $A>20$ that achieves a root-mean square deviation (RMSD) of 70 keV when compared to experimental data from AME2020, and the RMSD further diminishes to 49 keV when excluding five nuclei with experimental uncertainties larger than 100 keV. Based on the mass formula, we predict 174 atomic masses near the proton drip line with $20<A<115$, and tabulate the results in the Supplemental Material of this paper.