I am not joking. It took hours for me to crack this out. The protons in the nucleus move with certain velocity from heisenberg's uncertainty statement. The nucleus is spherical(not exact. But approximately). Any particle which moves inside a sphere, will be in circular motion(Due to the presence of a fixed reference center). The protons (also other nucleons) will be in Simple Harmonic Motion. We know that any simple harmonic motion is a projection of uniform circular motion. Thus, nucleons will be, for sure, in circular motion. This may lead to presence of orbits in the nucleus. If I went wrong in my explanation, please correct me.