Rayleigh scattering and depolarization ratio in linear alkylbenzene
Qian Liu, Xiang Zhou, Wenqian Huang, Yuning Zhang, Wenjie Wu, Wentai, Luo, Miao Yu, Yangheng Zheng, Li Zhou, Jun Cao, Yifang Wang
TL;DR
This paper reports the first measurement of anisotropic Rayleigh scattering and depolarization ratio in linear alkylbenzene, providing a more accurate scattering length crucial for neutrino detector transparency.
Contribution
It introduces an indirect measurement method for Rayleigh scattering in LAB and determines its scattering length at 430 nm for the first time.
Findings
Rayleigh scattering in LAB is anisotropic.
Depolarization ratio of LAB is 0.31.
Rayleigh scattering length of LAB is 28.2 meters at 430 nm.
Abstract
Linear alkylbenzene (LAB) is adopted to be the organic solvent for the Jiangmen Underground Neutrino Observatory (JUNO) liquid scintillator detectors due to the ultra-transparency. However the current Rayleigh scattering length calculation disagrees with the measurement. The present paper for the first time reports the Rayleigh scattering of LAB being anisotropic and the depolarization ratio being 0.31+-0.01(stat.)+-0.01(sys.). We proposed an indirectly method for Rayleigh scattering measurement with Einstein-Smoluchowski-Cabannes formula, and the Rayleigh scattering length of LAB is determined to be 28.2+-1.0 m at 430 nm.
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