Extraction of the ratio of the neutron to proton structure functions from deep inelastic scattering

The authors study the nuclear (A) dependence of the European Muon Collaboration (EMC) effect at high values of x (x ≥ 0.6). Their approach makes use of conventional nuclear degrees of freedom within the Relativistic Impulse Approximation. By performing a non-relativistic series expansion they demonstrate that relativistic corrections make a substantial contribution to the effect at x approx > 0.6$ and show that the ratio of neutron to proton structure functions extracted from a global fit to all nuclei is not inconsistent with values obtained from the deuteron