Neutron decay is not a electromagnetic phenomena at all. It is governed by the weak nuclear force. This is well supported by fact that [the lifetime of the neutron][1] fits neatly into [weak universality][2], by the [energy distribution][3] of [neutron decay products][4], and by the fact that anti-neutrino initiated "inverse beta decay" can be shown to be proportional to the power of near-by nucler reactors or to beam intensity in accelerator experiments.

Secondly the neutron is *not* it's own antiparticle. [The anti-neutron is a distinct particle.][5]


  [1]: https://physics.stackexchange.com/questions/31514/why-is-the-free-neutron-lifetime-so-long/31517#31517
  [2]: https://physics.stackexchange.com/questions/11664/universality-in-weak-interactions
  [3]: https://physics.stackexchange.com/q/31498/520
  [4]: https://physics.stackexchange.com/q/21814/520
  [5]: https://physics.stackexchange.com/questions/29384/anti-matter-for-neutrons