Artur M. Ankowski, Omar Benhar, Takaaki Mori, Ryuta Yamaguchi, Makoto Sakuda
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.
View original:
http://arxiv.org/abs/1110.0679
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