Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Observation of Reactor Antineutrino Disappearance Using Delayed Neutron
  Capture on Hydrogen at RENO   The Reactor Experiment for Neutrino Oscillation (RENO) experiment has been
taking data using two identical liquid scintillator detectors of 44.5 tons
since August 2011. The experiment has observed the disappearance of reactor
neutrinos in their interactions with free protons, followed by neutron capture
on hydrogen. Based on 1500 live days of data taken with 16.8 GW$_{th}$ reactors
at the Hanbit Nuclear Power Plant in Korea, the near (far) detector observes
567690 (90747) electron antineutrino candidate events with a delayed neutron
capture on hydrogen. This provides an independent measurement of $\theta_{13}$
and a consistency check on the validity of the result from n-Gd data.
Furthermore, it provides an important cross-check on the systematic
uncertainties of the n-Gd measurement. Based on a rate-only analysis, we obtain
sin$^{2}$2$\theta _{13}$= 0.087 $\pm$ 0.008 (stat.) $\pm$ 0.014 (syst.).

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The categories of this paper are: chao-dyn
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The categories of this paper are: ao-sci
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The categories of this paper are: atom-ph
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The categories of this paper are: math-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: patt-sol
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The categories of this paper are: comp-gas
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The categories of this paper are: solv-int
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The categories of this paper are: eess
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The categories of this paper are: supr-con
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The categories of this paper are: astro-ph
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The categories of this paper are: math
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The categories of this paper are: nlin
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The categories of this paper are: chem-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: cond-mat