Studies of isospin symmetry by means of γ-ray spectroscopic methods of isobaric analogue states has made significant progress during the past decade — the description of so-called mirror-energy difference (MED) has moved forward from a qualitative to a quantitative understanding [1, 2]. The different spatial distributions of the protons in the respective mirror states give rise to isospin breaking Coulomb effects and nuclear components [3, 4], which allows for subtle nuclear structure investigations on the basis of modern large-scale shell-model calculations . Experimentally, these advances are mainly linked to 4π Gedetector instruments in conjunction with ancillary systems. Lately, these combinations pushed for isospin Tz = ±1 or Tz = ±3/2 mirror systems  and electromagnetic decay properties; for example, isoscalar and isovector effectiv
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