Extended Data Fig. 2: The mirror chart of nuclides.
From: Mirror-symmetry violation in bound nuclear ground states
Mirror nuclei are plotted according to the isobaric spin (T) of their ground-state configurations. For almost the entire mirror chart, the spin and parity, Jπ, of the ground states are identically reflected across the N = Z line54. The black squares with cracks show the only two places on the mirror chart where this ground-state mirror symmetry is known or believed to be broken. Once adjusting for the energy shift of levels due to charge-breaking forces, the relative masses (ΔM) of mirror pairs (with the same magnitude Tz) become comparable, and the connection to IASs in neighbouring nuclei becomes clearer. This is illustrated by the isobar diagrams comparing the relative masses for two T = 3/2 multiplets, one in the A = 9 system and the other in the A = 73 system of interest.
