Yes! You can cool neutrons down to the point that you can collect them in a container, like a gas. They even "slosh around". Unfortunately because of the 10.3

Yes! You can cool neutrons down to the point that you can collect them in a container, like a gas. They even "slosh around". Unfortunately because of the 10.3 minute half-life of free neutrons, this is a hideously radioactive gas that is dangerous to be anywhere near.