  The reaction $\nu d \to \mu^- \Delta^{++} n$ is studied in the region of low
$q^2$ to investigate the effect of deuteron structure and width of the $\Delta$
resonance on the differential cross section. The results are used to extract
the axial vector $N-\Delta$ coupling $C^{A}_5$ from the experimental data on
this reaction. The possibility to determine this coupling from electroweak
interaction experiments with high intensity electron accelerators is discussed.
