Neutron Stability
Mathis says neutrons have a slightly different spin pattern than do protons and that the spin pattern changes to that of a proton when a positron collides with the neutron. The collision also transforms the positron to an electron. (The spins are what produce the wave patterns characteristic of EM radiation.) Is the neutron stable inside an atom because the atom shooting out charge photons keeps positrons away.

Proton Stability
If the neutron is unstable outside the atom because of positron collisions, shouldn't protons likewise be unstable because of electron collisions? Or is it stable for the same reason that atoms are, because the proton emits photons to keep other particles away, whereas neutrons emit very little photonic charge and are thus prone to collisions?

Neutronium
Might there be a process that could condense neutrons into neutronium, which is theorized to be the core of pulsars or neutron stars? I think in some versions of neutronium theory only the surface would be unstable, so the neutronium would decay very slowly from the outside inward. What about that?