分类： 物理学 >> 核物理学 提交时间： 2016-09-13
DING Xue-Feng
WEN Liang-Jian
ZHOU Xiang
DING Ya-Yun YE Xing-Chen
ZHOU Li2 LIU Meng-Chao
CAI Hao
CAO Jun
摘要： The fluorescence quantum yield of bis-MSB, a widely used liquid scintillator wavelength shifter, was measured to study the photon absorption and re-emission processes in liquid scintillator. The re-emission process affects the photoelectron yield and distribution, especially in a large liquid scintillator detector, thus must be understood to optimize the liquid scintillator for good energy resolution and to precisely simulate the detector with Monte Carlo. In this study, solutions of different bis-MSB concentration were prepared for absorption and fluorescence emission measurements to cover a broad range of wavelengths. Harmane was used as a standard reference to obtain the absolution fluorescence quantum yield. For the first time we measured the fluorescence quantum yield of bis-MSB up to 430 nm as inputs required by Monte Carlo simulation, which is 0.926±0.053 at λex = 350 nm.
分类： 物理学 >> 核物理学 提交时间： 2016-09-13
YE Xing-Chen
YU Bo-Xiang
ZHOU Xiang
ZHAO Li
DING Ya-Yun
LIU Meng-Chao
DING Xue-Feng
ZHANG Xuan
JIE Quan-Lin
ZHOU Li
FANG Jian
CHEN Hai-Tao
HU Wei
NIU Shun-Li
YAN Jia-Qing
ZHAO Hang
HONG Dao-Jin
摘要： Liquid scintillator (LS) will be adopted as the detector material in JUNO (Jiangmen Underground Neutrino Observatory). The energy resolution requirement of JUNO is 3%, which has never previously been reached. To achieve this energy resolution, the light yield of liquid scintillator is an important factor. PPO (the fluor) and bis-MSB (the wavelength shifter) are the two main materials dissolved in LAB. To study the influence of these two materials on the transmission of scintillation photons in LS, 25 and 12 cm-long quartz vessels were used in a light yield experiment. LS samples with different concentration of PPO and bis-MSB were tested. At these lengths, the light yield growth is not obvious when the concentration of PPO is higher than 4 g/L. The influence from bis-MSB becomes insignificant when its concentration is higher than 8 mg/L. This result could provide some useful suggestions for the JUNO LS.
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