With a gravity well, to be sure. We can reflect and collimate beams, but I don’t think there’s much success capturing sizable volumes of free neutron particles

With a gravity well, to be sure. We can reflect and collimate beams, but I don’t think there’s much success capturing sizable volumes of free neutron particles in a chamber. We know that we can collect neutrons into a degenerate gas. But it probably all tends to sink toward the center of the earth, like subatomic bouncy balls. https://en.wikipedia.org/wiki/Neutronium https://en.wikipedia.org/wiki/Neutronium It’s still theoretical though. We haven’t bottled it for sale yet. It would probably have lots of interesting applications, not the least of which would include weaponization.