A neutron is a subatomic particle found in the nucleus of an atom. It has no electrical charge, but it is slightly heavier than a proton. Neutrons play a crucial role in holding the nucleus together. Full definition
Other kinds of collisions, however — between two remnants of stars called neutron stars — could produce light. (sciencenews.org)
This event also provides the strongest evidence yet that short duration gamma - ray bursts are caused by mergers of neutron stars. (sciencedaily.com)
They even provided evidence that all the gold in the universe and about half of the elements heavier than iron result from neutron star mergers. (discovermagazine.com)