Role of the Delta ( 1232 ) in DIS on polarized 3 He and extraction of the neutron spin structure function g n 1 ( x , Q 2 )

We consider the effect of the transitions n → ∆ 0 and p → ∆ + in deep inelastic scattering on polarized 3 He on the extraction of the neutron spin structure function g n 1 (x, Q 2). Making the natural assumption that these transitions are the dominant non-nucleonic contributions to the renormalization of the axial vector coupling constant in the A = 3 system, we find that the effect of ∆ increases g n 1 (x, Q 2) by 10 ÷ 40% in the range 0.05 ≤ x ≤ 0.6, where our considerations are applicable and most of the data for g n 1 (x, Q 2) exist.