\(\cfrac{m_ec^2}{r_e}=\cfrac{q^2}{4\pi\varepsilon_or^2_e}+Av^2-\cfrac{T_eT_n}
{4\pi\tau_or^2_e}\)
An electron shot into the nucleus of a heavy atom, where the nucleus is large, will set off an matter/antimatter reaction at the nucleus. The resulting increase in temperature at the nucleus will increase \(r_e\) and cause the electrons to collide into other nuclei. We have a chained reaction.
Yes, an electron.
