In my nuclear physics textbook (from 1988), there's a section which lists properties of the nuclear force, including one section about how the nucleon-nucleon interaction may depend on the momentum or velocity of the nucleons. (It talks mostly about the spin-orbit term, which is V(r)*(r x p) dot S, where r, p, and S are vectors, and S is the sum of the spin of the two nucleons.) I have a few questions about this: 1. Is this in any way analogous to how a magnetic force is produced by a moving charged particle? In other words, is the spin orbit term something that should be thought of as a purely quantum-mechanical thing, or is it basically the nuclear force's "magnetism"? 2. Where can I find more information about momentum-dependency? 3. I'm looking for a nuclear physics topic to do a short (~6-page) paper on for next Tuesday. Is this a manageable topic, or is it too obscure or difficult to write a paper on?