  We propose a high-statistics measurement of few body nuclear structure and
short range correlations in quasi-elastic scattering at 6.6 GeV from $^2$H,
$^3$He and $^3$H targets in Hall B with the CLAS12 detector.
  We will measure absolute cross sections for $(e,e'p)$ and $(e,e'pN)$
quasi-elastic reaction channels up to a missing momentum $p_{miss} \approx 1$
GeV/c over a wide range of $Q^2$ and $x_B$ and construct the isoscalar sum of
$^3$H and $^3$He. We will compare $(e,e'p)$ cross sections to nuclear theory
predictions using a wide variety of techniques and $NN$ interactions in order
to constrain the $NN$ interaction at short distances. We will measure
$(e,e'pN)$ quasi-elastic reaction cross sections and $(e,e'pN)/(e,e'p)$ ratios
to understand short range correlated (SRC) $NN$ pairs in the simplest
non-trivial system. $^3$H and $^3$He, being mirror nuclei, exploit the maximum
available isospin asymmetry. They are light enough that their ground states are
readily calculable, but they already exhibit complex nuclear behavior,
including $NN$ SRCs. We will also measure $^2$H$(e,e'p)$ in order to help
theorists constrain non-quasielastic reaction mechanisms in order to better
calculate reactions on $A=3$ nuclei. Measuring all three few body nuclei
together is critical, in order to understand and minimize different reaction
effects, such as single charge exchange final state interactions, in order to
test ground-state nuclear models.
  We will also measure the ratio of inclusive $(e,e')$ quasi-elastic cross
sections (integrated over $x_B$) from $^3$He and $^3$H in order to extract the
neutron magnetic form factor $G_M^n$ at small and moderate values of $Q^2$. We
will measure this at both 6.6 GeV and 2.2 GeV.

Nuclear Experiment