  We discuss the feasibility of a weak charged current experiment using a low
energy electron beam. A first goal is to measure the Q^2 dependence of the
axial-vector form factor g_a(Q^2). It can be measured model-independently and
as robustly as for electromagnetic form factors from typical electron
scattering experiments, in contrast to the methods used so far to measure
g_a(Q^2). If g_a(Q^2) follows a dipole form, the axial mass can be extracted
with a better accuracy than the world data altogether. The most important
detection equipment would be a segmented neutron detector with good momentum
and angular resolution that is symmetric about the beam direction, and covers a
moderate angular range. A high intensity beam (100 uA) is necessary. Beam
polarization is highly desirable as it provides a clean measurement of the
backgrounds. Beam energies between 70 and 110 MeV are ideal. This range would
provide a Q^2 mapping of g_a between 0.01
