Measurement of the Reaction ${}^{12}C({\nu }_{\mu },{\mu }^{-})X$ Near Threshold

Abstract

The reaction ${}^{12}C({\nu }_{\mu },{\mu }^{-})X$ has been measured near threshold using a ${\pi }^{+}$ decay-in-flight ${\nu }_{\mu }$ beam from the Los Alamos Meson Physics Facility and a massive liquid scintillator neutrino detector (LSND). In the energy region $123.7<E_{\nu }<280$ MeV, the measured spectral shape is consistent with that expected from the Fermi Gas Model. However, the measured flux-averaged inclusive cross section ($(8.3\pm 0.7stat.\pm 1.6syst.)\times 10^{-40}c{m}^2$) is more than a factor of 2 lower than that predicted by the Fermi Gas Model and by a recent random phase approximation calculation.

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