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Detector construction status; Production and properties of the acrylic vessel for the JSNS$$^2$$ neutrino detector

JSNS$$^2$$実験の現状; アクリルタンク製作とその性能評価

日野 陽太; 長谷川 勝一   ; 古田 久敬*; 丸山 和純*; 末包 文彦*

Hino, Yota; Hasegawa, Shoichi; Furuta, Hisataka*; Maruyama, Takasumi*; Suekane, Fumihiko*

J-PARC MLFにおけるステライルニュートリノ探索実験JSNS$$^2$$では、Gd入り液体シンチレーターを用いたニュートリノ検出器の建設が進行中である。特に、Gd入り液体シンチレーターを保持するためのアクリルタンクの製作が台湾において行われ、台湾及び日本において完成したアクリルタンクの性能評価を行った。本発表では、これらの性能評価の結果を検出器の健全性と安全性の観点から報告する。

JSNS2 (J-PARC Sterile Neutrino Search at J-PARC Spallation Neutron Source) is a short baseline neutrino oscillation experiment searching for appearance oscillation caused by sterile neutrinos in Material and Life Science Experimental Facility (MLF) of J-PARC. The JSNS2 detector consists of 17 tons of Gadolinium loaded liquid scintillator (Gd-LS) contained in an acrylic vessel at the center of the detector and 33 tons of unloaded liquid scintillator. The Gd-LS layer is a fiducial volume for neutrino detection via the inverse beta-decay using the delayed coincidence method. The acrylic vessel has been manufactured in Taiwan, and its quality has been investigated from the viewpoints of detector performance and safety. In this presentation, we report the design and the result of the surveys of optical properties, geometry, pressure resistance and leakage, and present status of the detector construction.

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