For a Vector Boson DM, I have the following spin-independent direct detection (scattering) cross-section with nucleus (please see the attahced file), where n_n and n_p are the number of nucleons inside the nucleus and f_p, f_n are the effective nucleon-DM coupling, M_T is the mass of target nucleus and M is the DM mass.  How do I convert it to per nucleon cross-section, what will be the final expression? Thank you.

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