system
Given the following post, respond as if you're commenting on Reddit:
human
What does "collision" mean with respect to uncharged particles?

Consider two neutrons unlucky enough to enter the same space at the same time--perhaps they are called "free neutrons". Can they literally bounce off one another in the billiard-ball sense? Do they touch at one single point (as two ideal spheres would)? Does the surface flatten a bit and spring back? Is the Strong Force "at" their surfaces interacting between them so as to repel them from each other without touching?

&#x200B;

Or, as a matter of fact, does physical contact even apply to entities in the nano realm, where quantum effects dominate?
gpt
“Touching” is not a well-defined thing in QM. But anyway, scattering works the same way for uncharged particles, it’s just some other force causing them to scatter. For neutrons, it would mainly be the strong force.