Universal $Z^{2/3}/\sqrt{Q_α}$ Scaling Law in Alpha Decay from Nuclei to Neutron-Star Mergers

We establish a universal scaling law for $α$-decay half-lives based on the variable $X_a = Z^a/\sqrt{Q_α}$, which collapses experimental and theoretical data spanning over twenty orders of magnitude onto a single linear correlation. Global optimization over the complete set of even-even $α$ emitters