Neutron-spheres

A neutron-sphere is one of two possible types of astral-body
which remain after a supernova, and which is formed from the core of the
supernova's star.
Neutron-spheres are usually called by the misnomer "neutron stars".
The other possible type of astral-body that remains is a quark-sphere,
which is usually called by the misnomer "black hole".

Neutron-spheres are composed largely or entirely of
neutron-degenerate matter, which means that the neutrons are not
organized into separate nuclei.
Consequently, a neutron-sphere is like a giant atomic nucleus.

The core of a portion of the neutron-spheres, probably the majority thereof,
is composed not of neutron-degenerate matter, but of quark-degenerate matter,
due to the higher pressure therein.
Quark-degenerate matter is what the quark-spheres are composed of.
The more massiv the neutron-sphere, the larger the fraction of its interior is
composed of quark-degenerate matter.

At the core of that quark-degenerate matter, where the pressure is highest,
the quark-matter is broken-down into high-energy photons.
The energy of those photons depends upon how much energy is put-into
their predecessor-quarks via the extreme pressure, such that the higher the pressure,
the higher the energy of the photons.
Consequently, those photons range in energy from X-rays to "soft" gamma-rays.
By comparison, quark-spheres have higher core-pressure,
and therefore have higher-frequency photon emissions.