Study of the Reactionν+n→μ−+p

Abstract

166 events of the reaction $\ensuremath{\nu}+n\ensuremath{\rightarrow}{\ensuremath{\mu}}^{\ensuremath{-}}+p$ at an average neutrino energy of \ensuremath{\sim} 0.7 GeV have been observed in the Argonne National Laboratory 12-ft deuterium bubble chamber. The results are well described by the conventional current-current weak-interaction theory with three real form factors ${{F}_{V}}^{1}$, ${{F}_{V}}^{2}$, and ${F}_{A}$. Using electron-nucleon scattering results to fix the vector mass ${M}_{V}$ at 0.84 GeV, and assuming a dipole form for ${F}_{A}$, we obtain the value 0.95 \ifmmode\pm\else\textpm\fi{} 0.12 GeV for the axial-vector mass ${M}_{A}$.