Upgrade of NaI(Tl) crystal encapsulation for the NEON experiment
arxiv(2024)
摘要
The Neutrino Elastic-scattering Observation with NaI(Tl) experiment (NEON)
aims to detect coherent elastic neutrino-nucleus scattering (CEνNS) in a
NaI(Tl) crystal using reactor anti-electron neutrinos at the Hanbit nuclear
power plant complex. A total of 13.3 kg of NaI(Tl) crystals were initially
installed in December 2020 at the tendon gallery, 23.7±0.3 m away from the
reactor core, which operates at a thermal power of 2.8 GW. Initial engineering
operation was performed from May 2021 to March 2022 and observed unexpected
photomultiplier-induced noise and a decreased light yield that were induced by
leakage of liquid scintillator into the detector due to weakness of detector
encapsulation. We upgraded the detector encapsulation design to prevent leakage
of the liquid scintillator. Meanwhile two small size detectors were replaced
with large size detectors returning a total mass of 16.7 kg. With this new
design implementation, the detector system has been operating stably since
April 2022 for over a year without detector gain drop. In this paper, we
present an improved crystal encapsulation design and stability of the NEON
experiment.
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