Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Neutrinos Angra experiment: commissioning and first operational
  measurements   The Neutrinos Angra Experiment has completed a major step by finishing the
comissioning of the detector and the data acquisition system at the
experimental site located in the Angra dos Reis nuclear power plant. The
experiment consists of a water-based detector and associated electronics, both
designed with the goal of detecting the electron antineutrinos produced by the
nuclear reactor. The detection is possible due to the Inverse Beta Decay, where
the final products in the water are photons in the UV-to-visible range of the
spectrum. The assembled detector comprises three active volumes filled with
water: (i) a cubic target detector for electron antineutrinos, covered by 32
8-inches PMTs, (ii) a lateral layer surrounding the target (veto) equipped with
4 PMTs and (iii) a third volume covering the top of both, also equipped with
4~PMTs. In the present document the main features of the detector assembly as
well as the integration of the readout electronics on-site are reported.
Finally, some operational characteristics are shown based on straightforward
analysis of the first measurements performed during the last months with the
fully working detector.

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The categories of this paper are: eess
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The categories of this paper are: gr-qc
32
The categories of this paper are: atom-ph
4
The categories of this paper are: cond-mat
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The categories of this paper are: acc-phys
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The categories of this paper are: hep-ph
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The categories of this paper are: supr-con
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The categories of this paper are: plasm-ph
9
The categories of this paper are: nlin
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The categories of this paper are: nucl-th
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The categories of this paper are: q-bio
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The categories of this paper are: chao-dyn
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The categories of this paper are: quant-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: astro-ph
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The categories of this paper are: patt-sol