For 10 points, name these stars that are composed of and named for a certain nuclear particle.
These objects can experience a sudden spin-up or "glitch" when their crusts crack during a starquake, reducing their equatorial radii. It is thought that soft gamma repeaters are one type of these objects that are characterized by having gigatesla magnetic fields. A binary system of these was first discovered in 1974 and provided indirect evidence for gravitational radiation. They are slightly less-dense than quark stars, and form from core-collapse supernovae in stars under approximately 10 solar masses. For 10 points, name these stars that are composed of and named for a certain nuclear particle.
These objects can experience a sudden spin-up or "glitch" when their crusts crack during a starquake, reducing their equatorial radii.
neutron stars [prompt on "pulsars" or "magnetars"]