A first glimpse at the shell structure beyond 54<//SUP> Ca: Spectroscopy of 55<//SUP> K, 55<//SUP> Ca, and 57<//SUP> Ca - Koiwai, T; K. Wimmer; Doornenbal, P; Obertelli, A; Barbieri, C; Duguet, T; Holt, JD; Miyagi, T; Navratil, P; Ogata, K; others (Physics Letters B, 2022)