Q&A: Supernova Remnants and Neutron Stars
In Chandra Digest G54.1, reference is made to "a disc of matter
and antimatter" surrounding SNR G54.1+ 03. How is mutual annihilation avoided?
Mutual annihilation of matter and anti-matter almost certainly occurs, but
further out in the nebula. The disk is a flow pattern that is continually
resupplied with matter and antimatter electrons created near the surface
of the neutron star by the interaction of photons with the extremely strong
magnetic field there.