baryon degenerate matter
Baryon degenerate matter is a form of degenerate
matter in which electrons have been
forced into the confines of atomic nuclei by the weight of overlying material.
Once inside the nucleus, electrons merge with protons to form neutrons, which, obeying the Pauli
exclusion principle, provide the degeneracy pressure to resist further
collapse. This pressure can only be overcome in a collapsed star that exceeds
the Oppenheimer-Volkoff limit.