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Kamil, M.; Triambak, S.; Magilligan, A.; Garcia, A.; Brown, B. A.; Adsley, P.; Bildstein, V.; Burbadge, C.; Varela, A. Diaz; Faestermann, T.; Garrett, P. E.; Hertenberger, R.; Kheswa, N. Y.; Leach, K. G.; Lindsay, R.; Marin-Lambarri, D. J.; Moradi, F. Ghazi; Mukwevho, N. J.; Neveling, R.; Ondze, J. C. Nzobadila; Papka, P.; Pellegri, L.; Pesudo, V.; Rebeiro, B. M.; Scheck, M.; Smit, F. D. and Wirth, H.-F. (2021): Isospin mixing and the cubic isobaric multiplet mass equation in the lowest T=2, A=32 quintet. In: Physical Review C, Vol. 104, No. 6, L061303

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The isobaric multiplet mass equation (IMME) is known to break down in the first T = 2, A = 32 isospin quintet. In this work we combine high-resolution experimental data with state-of-the-art shell-model calculations to investigate isospin mixing as a possible cause for this violation. The experimental data are used to validate isospin-mixing matrix elements calculated with newly developed shell-model Hamiltonians. Our analysis shows that isospin mixing with nonanalog T = 1 states contributes to the IMME breakdown, making the requirement of an anomalous cubic term inevitable for the multiplet.

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