Mr. Adams et al., MEASUREMENT OF THE RATIO SIGMA(N) SIGMA(P) IN INELASTIC MUON-NUCLEON SCATTERING AT VERY-LOW X AND Q(2)/, Physics letters. Section B, 309(3-4), 1993, pp. 477-482
We present results on the cross-section ratio for inelastic muon scatt
ering on neutrons and protons as a function of Bjorken x. The data ext
end to x values two orders of magnitude smaller than in previous measu
rements, down to 2 x 10(-5), for Q2 > 0.01 GeV2. The ratio is consiste
nt with unity throughout this new range.