Measurements of charged current reactions ofνeon12C

Charged current reactions of ${\nu }_e$ on ${}^{12}\mathrm{C}$ have been studied using a ${\mu }^{+}$ decay-at-rest ${\nu }_e$ beam at the Los Alamos Neutron Science Center. The cross section for the exclusive reaction ${}^{12}\mathrm{C}({\nu }_e{,e}^{-}{)}^{12}{\mathrm{N}}_{\mathrm{g}.\mathrm{s}.\mathrm{}}$ was measured to be $(8.9\mathrm{}\pm 0.3\pm 0.9)\times {10}^{-42}$ ${\mathrm{cm}}^2.$ The observed energy dependence of the cross section and angular distribution of the outgoing electron agree well with theoretical expectations. Measurements are also presented for inclusive transitions to ${}^{12}\mathrm{N}$ excited states, ${}^{12}\mathrm{C}({\nu }_e{,e}^{-}{)}^{12}{\mathrm{N}}^{*}$ and compared with theoretical expectations. The measured cross section, $(4.3\mathrm{}\pm 0.4\pm 0.6)\times {10}^{-42}$ ${\mathrm{}\mathrm{cm}}^2,$ is somewhat lower than previous measurements and than a continuum random phase approximation calculation. It is in better agreement with a recent shell model calculation.