Neutral-current background induced by atmospheric neutrinos at large liquid-scintillator detectors: III. Quantitative calculations for reactor neutrinos
arxiv(2024)
摘要
Atmospheric neutrinos contribute significantly to irreducible backgrounds
through their neutral-current (NC) interactions with ^12C nuclei in
liquid-scintillator detectors, impacting diffuse supernova neutrino background,
nucleon decay, and reactor neutrinos. This paper extends our prior work by
systematically studying the NC backgrounds towards the MeV region of reactor
neutrinos. We employ contemporary neutrino generator models from GENIE and
NuWro for calculations, with a focus on predicting NC background in
experimental searches for inverse-beta-decay signals below 100 MeV visible
energy. We estimate the systematic uncertainty to our estimation of the NC
background using various data-driven neutrino generator models, addressing
factors such as the initial neutrino-nucleon NC interaction, the nuclear model,
the final-state interaction model, the nucleus deexcitation, and the secondary
interaction on final-state particles.
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