Isospin Symmetry Breaking in the 71Kr and 71Br Mirror System - Algora, A; Vitez-Sveiczer, A; Poves, A; Kiss, G G; Rubio, B; Recchia, F; Nishimura, S; Rodriguez, T; Sarriguren, P; Agramunt, J; Guadilla, V; Montaner-Piza, A; et al. (Physical Review Letters, 2025)