Measurement of Electron-Neutrino Charged-Current Cross Sections on I127 with the COHERENT NaIνE Detector

Résumé fourni par la source

Using an 185-kg NaI[Tl] array, COHERENT has measured the inclusive electron-neutrino charged-current cross section on $^{127}\mathrm{I}$ with pion decay-at-rest neutrinos produced by the Spallation Neutron Source at Oak Ridge National Laboratory. Iodine is one the heaviest targets for which low-energy ($\ensuremath{\le}50\text{ }\text{ }\mathrm{MeV}$) inelastic neutrino-nucleus processes have been measured, and this is the first measurement of its inclusive cross section. After a five-year detector exposure, COHERENT reports a flux-averaged cross section for electron neutrinos of ${9.2}_{\ensuremath{-}1.8}^{+2.1}\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}40}\text{ }\text{ }{\mathrm{cm}}^{2}$. This corresponds to a value that is $\ensuremath{\sim}41%$ lower than predicted using the MARLEY event generator with a measured Gamow-Teller strength distribution. In addition, the observed visible spectrum from charged-current scattering on $^{127}\mathrm{I}$ has been measured between 10 and 55 MeV, and the exclusive zero-neutron and one-or-more-neutron emission cross sections are measured to be ${5.2}_{\ensuremath{-}3.1}^{+3.4}\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}40}$ and ${2.2}_{\ensuremath{-}2.2}^{+3.5}\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}40}\text{ }\text{ }{\mathrm{cm}}^{2}$, respectively.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.