The proton shielding might attract an approaching electron, but the electron cloud below repels any negative charge. The other negative particle clouds \(g^{-}\) and \(T^{-}\) are above this electron cloud.
All negative particles can trigger a nucleic disintegration. The trick is to get as far into the nucleus as possible.
(\(T^{-}\), \(g^{-}\), \(e^{-}\))
This particle has an outer electron, holding it in orbit is a spinning \(g^{-}\) particle that generates a weak \(E\) field. A \(T^{-}\) particle spins in the core and holds the \(g^{-}\) particle with a weak \(g\) field. Such a particle will penetrate into Uranium, \(Ur\) as far as the electron cloud, unimpeded. The particle disintegrate and the other negative particles are freed within the nucleus.
This will probably just strip the outer layers of the atom. Further impacts might disintegrate the nucleus.
A chain reaction not!