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Understanding the differences between the distribution of quarks bound inprotons and neutrons is key for constraining the mechanisms of SU(6)spin-flavor symmetry breaking in Quantum Chromodynamics (QCD). While vastamounts of proton structure measurements were done, data on the structure ofthe neutron is much more spars as experiments typically extract the structureof neutrons from measurements of light atomic nuclei using model-dependentcorrections for nuclear effects. Recently the MARATHON collaboration performedsuch an extraction by measuring inclusive deep-inelastic electron-scattering onhelium-3 and tritium mirror nuclei where nuclear effects are expected to besimilar and thus be suppressed in the helium-3 to tritium ratio. Here weevaluate the model dependence of this extraction by examining a wide range ofmodels including the effect of using instant-form and light-cone nuclear wavefunctions and several different parameterizations of nucleon modificationeffects, including those with and without isospin dependence. We find that,while the data cannot differentiate among the different models of nuclearstructure and nucleon modification, they consistently prefer aneutron-to-proton structure function ratio of at $x_B \rightarrow 1$ of $\sim0.4$ with a typical uncertainty ($1\sigma$) of $\sim0.05$ and $\sim0.10$ forisospin-independent and isospin-dependent modification models, respectively.While strongly favoring SU(6) symmetry breaking models based on perturbativeQCD and the Schwinger-Dyson equation calculation, the MARATHON data do notcompletely rule out the scalar di-quark models if an isospin-dependentmodification exist.

Nucleon off-shell structure and the free neutron valence structure from A=3 inclusive electron scattering measurements