The Nolen-Schiffer Anomaly with IMSRG(2) Calculations

The Nolen-Schiffer anomaly, a discrepancy between theoretical and experimental binding energy differences of mirror nuclei, is investigated with IMSRG(2) calculations. With IMSRG(2), binding energies for mirror nuclei from A = 7 to A = 49 are calculated using various interaction models. These models are tested by calculating their charge radii. Compared to previous reports, the anomaly is resolved for most light nuclei, with remaining discrepancies at A = 13, 15, 37, and 39. A 3f2 correction improves the discrepancy but does not fully resolve it. Adding a Gaussian charge symmetry-breaking potential also fails to improve results. These findings highlight the accuracy of IMSRG(2) compared to previous many-body methods.