Measurements of the reactions $12C(νμ,μ−)12Ng.s.$ and $12C(νμ,μ−)X$

Charged current scattering of $νμ$ on $12C$ has been studied [1] using a $π+$ decay-in-flight $νμ$ beam at the Los Alamos Meson Physics Facility. The observed flux-averaged cross section for the exclusive reaction $12C(νμ,μ−)12Ng.s.$ of $(6.6±1.0±1.0)×10−41 cm2$ agrees well with reliable theoretical expectations. A measurement was also obtained for the inclusive cross section to all accessible $12N$ states, $12C(νμ,μ−)X.$ This flux-averaged cross section is $(11.2±0.3±1.8)×10−40 cm2,$ which is approximately half of that given by a recent Continuum Random Phase Approximation (CRPA) calculation [2], but is in agreement with other calculations [3].