Münster 2017 – scientific programme

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T: Fachverband Teilchenphysik

T 57: Neutrinophysik 5 (Reaktorneutrinos)

T 57.7: Talk

Tuesday, March 28, 2017, 18:20–18:35, VSH 07

Online monitoring system for the liquid scintillator transparency in the JUNO Central Detector — •Wilfried Walter Depnering for the JUNO collaboration — JGU Mainz

In the last years, large-volume liquid scintillator (LS) detectors have made important contributions to low-energy neutrino physics. A future neutrino detector scaling this technology to 20 kt is the Jiangmen Underground Neutrino Observatory (JUNO). Its primary goal is to determine the neutrino mass hierarchy with at least 3σ significance. To reach that goal, an energy resolution of 3% @ 1 MeV is required. Therefor, the transparency of the LS has to be sufficiently high and stable during the whole operation time (attenuation length ≥ 20 m). This talk is about a laser system inside the detector for an online measurement of optical LS properties. It allows to detect potential aging effects of the liquid and a gradient in its refractive index. The latter can be caused by a temperature gradient and will lead to curved light propagation, which has to be taken into account in spatial event reconstruction. This work is funded by the DFG research unit “JUNO”.