Determination of the neutron spin structure function

The spin structure function of the neutron ${\mathit{g}}_1^{\mathit{n}}$ has been determined over the range 0.03<x<0.6 at an average ${\mathit{Q}}^2$ of 2 (GeV/c${)}^2$ by measuring the asymmetry in deep inelastic scattering of polarized electrons from a polarized ${}_{}{}^3{}_{}{}^{}\mathrm{He}$ target at energies between 19 and 26 GeV. The integral of the neutron spin structure function is found to be ${\mathcal{F}}_0^1$ ${\mathit{g}}_1^{\mathit{n}}$(x)dx=-0.022±0.011. Earlier reported proton results together with the Bjorken sum rule predict ${\mathcal{F}}_0^1$ ${\mathit{g}}_1^{\mathit{n}}$(x)dx=-0.059±0.019.