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In the deep inelastic region an effective neutron spin structure function can be extracted to first order from that of He if only S, S' and D states of the He wave function are included:
where , and
are the spin structure functions of an effective free neutron, a free proton and He, respectively.
% are the polarization values of the neutron and proton in He due to the S, S' and D states of the wave function.
An easier way to estimate from
, e.g., the dilution factor is about 3.