We have measured the inclusive scattering of muons of average energy 7.2 GeV from a variety of nuclear targets in the four-momentum-transfer range 0.6<Q²<4.0 (GeV/c)². We find that the data can be well represented as an incoherent sum of muon-proton and muon-neutron scattering except in the region x(≡1ω=Q²2mν)<0.1. A fit in this region by the form Aeff=σA[(Z/A)σₚ+(N/A)σₙ]=A^ρ yields a value of the exponent ρ of 0.963 ±{}0.006.
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May et al. (1975) studied this question.