  The MicroBooNE Experiment at the Fermi National Accelerator Laboratory, an
89-ton active mass liquid argon time projection chamber, affords a unique
opportunity to observe low-$Q^2$ neutral-current neutrino-proton scattering
events. Neutral-current neutrino-proton scattering at $Q^2 < 1$ GeV$^2$ is
dominated by the proton's axial form factor, which can be written as a
combination of contributions from the up, down, and strange quarks: $G_A(Q^2) =
\frac{1}{2}[-G_A^u(Q^2)+G_A^d(Q^2)+G_A^s(Q^2)]$. The contribution from up and
down quarks has been established in past charged-current measurements. The
contribution from strange quarks at low $Q^2$ remains unmeasured; this is of
great interest since the strange quark contribution to the proton spin can be
determined from the low-$Q^2$ behavior: $\Delta S = G_A^s(Q^2=0)$. MicroBooNE
began operating in the Booster Neutrino Beam in October 2015. I will present
the status in observing isolated proton tracks in the MicroBooNE detector as a
signature for neutral-current neutrino-proton events. The sensitivity of the
MicroBooNE experiment for measuring the strange quark contribution to the
proton spin will be discussed.
