Neutron stars were one of Tommy Gold’s more imaginative constructs trying to explain the rapid oscillations of pulsars using the gravitational model. He proposed these these stars were made of neutrons to supply the necessary mass to stop them falling apart due to the high rotational velocities.
There is a small problem with this ad hoc explanation for the observation – matter comprised of 100% neutrons is not known to exist because free neutrons spontaneously decay into a proton and electron in about 10 minutes (half-life) as the empirically determined plot below shows. Nuclei that differ significantly from the known ration of 1 to 1.5 neutrons per proton, spontaneously undergo radioactive decay transformations to get them closer the the nuclear stability field.
Matter made of 100% neutrons would be totally instable but as Pulsars obviously don’t decay into more stable forms of matter, and if they are not comprised of neutronium, then how else to explain their observed behaviour?
Ask an electrical engineer. Pulsars produce extremely high frequency EM radiation (both visible light and RF emissions), and x-ray pulsar JI808 flashes at 24,000 RPM, way beyond the redline for a neutron star. So what happened? They invented “Strange Matter”, when instead instead the phenomenon could be more easily explained as an electrical relaxation oscillator.
Neutron stars are impossible.