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Different models of this two-nucleon process disagree on how often it happens by up to a factor of about two.","posed_since":"","precise":"Determine the two-particle-two-hole (2p2h) charged-current cross section from meson-exchange currents and short-range correlations on 12C, 16O and 40Ar, double-differential in muon momentum and angle for $E_{\\nu}=0.5\\ \\text{to}\\ 5\\,\\mathrm{GeV}$, to 10 percent, together with its neutrino versus antineutrino difference and its proton-proton versus neutron-proton final-state composition. Existing microscopic models (for example Nieves et al., Martini et al., SuSAv2) disagree in normalization and in the energy-transfer distribution.","problem_ref":null,"references":"","settled_by":"An ab initio or microscopic calculation of 2p2h responses consistent with electron-scattering data in the dip region and with exclusive neutrino data on two-proton final states from argon and carbon detectors.","status_note":"","title":"Size and shape of multinucleon (2p2h) neutrino cross 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