I'm doing a paper on the strong nuclear force for a nuclear physics class. I want to give a good quantitative account for it. I'm very familiar with Lagrangian field theory but not so much with QFT or QCD. I don't have time to learn all of the ins and outs of QFT and for this paper and for this class I don't need to know. What I';m looking for specifically is just the Lagrangian for the strong nuclear before between one proton and one neutron. If I can describe quantitatively the strong attraction in deuterium (H 2) that would be excellent.