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:

(2) | |||

where , and are the spin structure functions of an effective free neutron, a free proton and He, respectively. % and % 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
is:
, e.g., the dilution factor is about 3.

Xiaochao Zheng 2001-06-09