1. The problem statement, all variables and given/known data This is not a homework question, I'm asking it here to avoid being shot down elsewhere. Are quarks tightly bound to each nucleon? Is the nucleus just a bunch of anonymous quarks held together by the strong nuclear force, or is each proton and neutron separate? When particles collide, to they "stick" to their "mother" nucleon? 3. What have you tried already? http://physics.stackexchange.com/questions/184220/what-is-the-motion-of-quarks-inside-nucleons but it didn't help much.