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We report the first measurement of the \eep three-body breakup reaction crosssections in helium-3 ($^3$He) and tritium ($^3$H) at large momentum transfer($\langle Q^2 \rangle \approx 1.9$ (GeV/c)$^2$) and $x_B>1$ kinematics, wherethe cross section should be sensitive to quasielastic (QE) scattering fromsingle nucleons. The data cover missing momenta $40 \le p_{miss} \le 500$ MeV/cthat, in the QE limit with no rescattering, equals the initial momentum of theprobed nucleon. The measured cross sections are compared with state-of-the-artab-initio calculations. Overall good agreement, within $\pm20\%$, is observedbetween data and calculations for the full $p_{miss}$ range for $^3$H and for$100 \le p_{miss} \le 350$ MeV/c for $^3$He. Including the effects ofrescattering of the outgoing nucleon improves agreement with the data at$p_{miss} > 250$ MeV/c and suggests contributions from charge-exchange (SCX)rescattering. The isoscalar sum of $^3$He plus $^3$H, which is largelyinsensitive to SCX, is described by calculations to within the accuracy of thedata over the entire $p_{miss}$ range. This validates current models of theground state of the three-nucleon system up to very high initial nucleonmomenta of $500$ MeV/c.

Probing few-body nuclear dynamics via 3H and 3He (e,e'p)pn cross-section measurements