I have often thought that for the unified field theory to be so elusive, we must be missing something. Perhaps this is it.
Since there is a potential link between neutrons, electrons and the new particle I looked up neutrons to try to get a better idea of what that might be. I discovered that neutrons are basically protons and that neutrons can decay readily into protons. I also discovered that neutrons do not ordinarily appear in nature for very long because they decay into protons in only about 15 minutes after being separated from an atomic nucleus.
Free protons are abundant in the universe and make up much of the solar wind. Since free neutrons normally do not (except theoretically inside neutron stars), it was interesting to read the following Wikipedia article excerpt:
Neutron CompoundsDineutrons and tetraneutrons
Main articles: Dineutron and Tetraneutron
The existence of stable clusters of 4 neutrons, or tetraneutrons, has been hypothesised by a team led by Francisco-Miguel Marqués at the CNRS Laboratory for Nuclear Physics based on observations of the disintegration of beryllium-14 nuclei. This is particularly interesting because current theory suggests that these clusters should not be stable.
In February 2016, Japanese physicist Susumu Shimoura of the University of Tokyo and co-workers reported they had observed the purported tetraneutrons for the first time experimentally.[73] Nuclear physicists around the world say this discovery, if confirmed, would be a milestone in the field of nuclear physics and certainly would deepen our understanding of the nuclear forces.[74][75]
The dineutron is another hypothetical particle. In 2012, Artemis Spyrou from Michigan State University and coworkers reported that they observed, for the first time, the dineutron emission in the decay of 16Be. The dineutron character is evidenced by a small emission angle between the two neutrons. The authors measured the two-neutron separation energy to be 1.35(10) MeV, in good agreement with shell model calculations, using standard interactions for this mass region.[76]
Neutronium and neutron stars[edit]
Main articles: Neutronium and Neutron star
At extremely high pressures and temperatures, nucleons and electrons are believed to collapse into bulk neutronic matter, called neutronium. This is presumed to happen in neutron stars.
The extreme pressure inside a neutron star may deform the neutrons into a cubic symmetry, allowing tighter packing of neutrons. END ARTICLE
The core of all conventional matter (baryons) is a proton. Theorists have always mused about what the properties would be of a form of matter only comprised of neutrons without any protons. I suppose that it is conceivable that matter which was made of only neutrons might have some properties that are associated with Dark Matter.
That is only speculation by a layman I know. Also, even though neutrons are electrically neutral, they do interact with all of the same fundamental forces as protons, which suggests that since Dark Matter is transparent to light, it is not comprised of neutron matter - because it would be opaque to light just as would regular matter.