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

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arxiv 1110.0679 v2 pith:57PJOSMU submitted 2011-10-04 nucl-th

Artur M. Ankowski , Omar Benhar , Takaaki Mori , Ryuta Yamaguchi , Makoto Sakuda This is my paper · ORCID
classification nucl-th
keywords energyinteractionsneutral-currentanalysisbeengamma-raylargerneutrino
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It has long been recognized that observation of gamma 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 gamma-ray production cross section for oxygen target. Our analysis is focused on the kinematical region of neutrino energy larger than ~200 MeV, in which 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 neutrino energy 600 MeV the fraction of neutral-current interactions leading to emission of gamma-rays of energy larger than 6 MeV is ~41%, and that the contribution of the p_3/2 state is overwhelming.

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