RealNucleus α-decay — Coulomb-barrier tunneling

The alpha (2e+4p) is RealNucleus's tight closed cluster. Here it is preformed inside the nucleus, striking the Coulomb barrier at the fast assault frequency f ~ 10²¹ Hz, and tunnelling out with the Gamow factor P=e^−2G. Rate λ=f·P. Crucially the rare factor P is Coulomb physics the model owns — so unlike beta decay (whose small parameter is the weak coupling G_F), alpha decay's timescale is reachable. The 30-order slowness comes from the exponentially small P.