  Electron scattering measurements from high-momentum nucleons in nuclei at
SLAC and Jefferson Lab (JLab) have shown that these nucleons are generally
associated with two-nucleon short-range correlations (2N-SRCs). These SRCs are
formed when two nucleons in the nucleus interact at short distance via the
strong tensor attraction or repulsive core of the NN potential. A series of
measurements at JLab have mapped out the A dependence and isospin dependence of
2N-SRCs, and have begun to map out their momentum structure. However, we do not
yet know if 3N-SRCs, similar high-momentum configurations of three nucleons,
play an important role in nuclei. We summarize here previous attempts to
isolate 3N-SRCs, go over the limitations of these previous attempts, and
discuss the present and near-term prospects for searching for 3N-SRCs, mapping
out their A dependence in nuclei, and constraining their isospin and momentum
structure.
