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High-momentum configurations of nucleon pairs at short-distance are probedusing measurements of the $^{12}$C$(e,e'p)$ and $^{12}$C$(e,e'pN)$ reactions(where $N$ is either $n$ or $p$), at high-$Q^2$ and $x_B>1.1$. The data span amissing-momentum range of 300--1000 MeV/c and are predominantly sensitive tothe transition region of the strong nuclear interaction from a Tensor to Scalarinteraction. The data are well reproduced by theoretical calculations using theGeneralized Contact Formalism with both chiral and phenomenologicalnucleon-nucleon ($NN$) interaction models. This agreement suggests that themeasured high missing-momentum protons up to $1000$ MeV/c predominantly belongto short-ranged correlated (SRC) pairs. The measured $^{12}$C$(e,e'pN)$ /$^{12}$C$(e,e'p)$ and $^{12}$C$(e,e'pp)$ / $^{12}$C$(e,e'pn)$ cross-sectionratios are consistent with a decrease in the fraction of proton-neutron SRCpairs and increase in the fraction of proton-proton SRC pairs with increasingmissing momentum. This confirms the transition from an isospin-dependent tensor$NN$ interaction at $\sim 400$ MeV/c to an isospin-independent scalarinteraction at high-momentum around $\sim 800$ MeV/c as predicted bytheoretical calculation.

$^{12}$C(e,e'pN) Measurements of Short Range Correlations in the Tensor-to-Scalar Interaction Transition Region