  Using the zero-range model, it was demonstrated recently that Levinger's
quasi-deuteron model can be utilized to extract the nuclear neutron-proton
contact. Going beyond the zero-range approximation and considering the full
nuclear contact formalism, we rederive here the quasi-deuteron model for the
nuclear photoabsorption cross-section and utilize it to establish relations and
constrains for the general contact matrix. We also define and demonstrate the
importance of the diagonalized nuclear contacts, which can be also relevant to
further applications of the nuclear contacts.
