Analysis of γ-ray production in neutral-current neutrino-oxygen interactions at energies above 200 MeV

Artur M. Ankowski, Omar Benhar, Takaaki Mori, Ryuta Yamaguchi, Makoto Sakuda

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23 Citations (Scopus)

Abstract

It has long been recognized that the observation of γ rays originating from nuclear deexcitation can be exploited to identify neutral-current neutrino-nucleus interactions in water-Cherenkov detectors. We report the results of a calculation of the neutrino- and antineutrino-induced γ-ray production cross section for the oxygen target. Our analysis is focused on the kinematical region of neutrino energy larger than ∼200MeV, in which a single-nucleon knockout is known to be the dominant reaction mechanism. The numerical results have been obtained using for the first time a realistic model of the target spectral function, extensively tested against electron-nucleus scattering data. We find that at a neutrino energy of 600 MeV the fraction of neutral-current interactions leading to emission of γ rays of energy larger than 6 MeV is ∼41%, and that the contribution of the p 3/2 state is overwhelming.

Original languageEnglish
Article number052505
JournalPhysical Review Letters
Volume108
Issue number5
DOIs
Publication statusPublished - Feb 1 2012

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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