How big is the neutron? The size of neutrons cannot be measured directly: it can only be determined from experiments involving other particles. While such calculations have so far been made in a very indirect way using old measurements with heavy atoms, a team has now taken a different approach. By combining their very accurate calculations with recent measurements on light nuclei, the researchers have arrived at a more direct methodology. Source 3m.
Well really, because these particles are so small scientists can only depend on precise mathematics to get the closest estimation they can towards the measurements they desire. Who knows though, maybe nanotechnology can be the future field of work that can finally give the true facts in the future.