An empirical formula for the proton radioactivity Jie-Dong Jiang, Xiao Liu, Yang-yang Xu, Biao He, Xi-Jun wu and Xiao-Hua Li Eur. Phys. J. A, 60 11 (2024) 224 Published online: 16 November 2024 DOI: 10.1140/epja/s10050-024-01443-y