How come I never see any equivelant of the particle in the box or harmonic oscillator counterparts for modeling of the atomic nucleus? I'm still a bit new to QM, but the only thing I ever see are QM descriptions of electrons, electron orbitals, electron spins, electron quantum entanglement, electron double slit, etc. Nothing ever for protons, gluons, etc., except for the nuclear shell model maybe, but nothing in-depth even on that. Can you even apply the Shrodinger equation to a proton? I've never seen it. Any references would be great.