  The available world deep-inelastic scattering data on proton and deuteron
structure functions F2p, F2d, and their ratios, are leveraged to extract the
free neutron F2n structure function, the F2n/F2p ratio, and associated
uncertainties using the latest nuclear effect calculations in the deuteron.
Special attention is devoted to the normalization of the proton and deuteron
experimental datasets and to the treatment of correlated systematic errors, as
well as the quantification of procedural and theoretical uncertainties. The
extracted F2n dataset is utilized to evaluate the Q2 dependence of the
Gottfried sum rule and the nonsinglet F2p - F2n moments. To facilitate
replication of our study, as well as for general applications, a comprehensive
DIS database including all recent JLab 6 GeV measurements, the extracted F2n, a
modified CTEQ-JLab global PDF fit named CJ15nlo_mod, and grids with calculated
proton, neutron and deuteron DIS structure functions at next-to-leading order,
are discussed and made publicly available.
