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We give an overview of a model to describe deep-inelastic scattering (DIS)off the deuteron with a spectator proton, based on the virtual nucleonapproximation (VNA). The model accounts for the final-state interactions (FSI)of the DIS debris with the spectator proton. Values of the rescattering crosssection are obtained by fits to high-momentum spectator data. By using theso-called "pole extrapolation method", free neutron structure functions can beobtained by extrapolating low-momentum spectator proton data to the on-shellneutron pole. We apply this method to the BONuS data set and find a surprisingBjorken $x$ dependence, indicating a possible rise of the neutron to protonstructure function ratio at high $x$.

Tagged spectator deep-inelastic scattering off the deuteron as a tool to study neutron structure