Spin–orbit coupling — UPSC Physics Optional CSE 2019 Paper II

Given that the single particle energy separation between 1d_{5/2} and 1d_{3/2} in {}^{17}\mathrm{O} is 5\,\mathrm{MeV}. Calculate the strength of spin-orbit interaction. It is observed that 1d_{5/2} level is lower than 1d_{3/2} level.