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1. chinaXiv:201711.02297 [pdf]

The low temperature performance of CsI(Na) crystals for WIPMs direct searchesI

Xuan Zhang; Xilei Sun; Junguang Lu; Pin Lv
Subjects: Physics >> General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.

Previous studies showed that CsI(Na) crystals have signi cantly di erent wave- forms between alpha and gamma scintillations. In this work, the light yield and PSD capability of CsI(Na) scintillators as a function of the temperature down to 80 K has been studied. As temperature drops, the fast component rises and the slow component decreases. By cooling the CsI(Na) crystals, the light yield of high ionization events are enhanced signi cantly, while the light yield of background gamma events are suppressed. At 110 K, CsI(Na) crystal achieves the optimal balance between low threshold and good background re- jection performance. The di erent responses of CsI(Na) to gamma and alpha at di erent temperatures are explained with self-trapped and activator lumines- cence centers.

submitted time 2017-11-10 Hits1033Downloads545 Comment 0

2. chinaXiv:201609.00902 [pdf]

Spectroscopic study of light scattering in linear alkylbenzene for liquid scintillator neutrino detectors

Xiang Zhou; Qian Liu; Junbo Han; Zhenyu Zhang; Xuan Zhang; Yayun Ding; Yangheng Zheng; Li Zhou; Jun Cao; Yifang Wang
Subjects: Physics >> Nuclear Physics

We has set up a light scattering spectrometer to study the depolarization of light scattering in linear alkylbenzene. From the scattering spectra it can be unambiguously shown that the depolarized part of light scattering belongs to Rayleigh scattering. The additional depolarized Rayleigh scattering can make the effective transparency of linear alkylbenzene much better than it was expected. Therefore sufficient scintillation photons can transmit through the large liquid scintillator detector of JUNO. Our study is crucial to achieving the unprecedented energy resolution 3\%/E(MeV)???????√?for JUNO experiment to determine the neutrino mass hierarchy. The spectroscopic method can also be used to judge the attribution of the depolarization of other organic solvents used in neutrino experiments.

submitted time 2016-09-13 Hits969Downloads575 Comment 0

3. chinaXiv:201608.00193 [pdf]

The laboratory measurement of radioactivity purification for Pb212 in liquid scintillator

Wei Hu; Jian Fang; Bo-Xiang Yu; Xuan Zhang; Li Zhou; Xiao Cai; Li-Jun Sun; Wan-Jin Liu; Lan Wang; Jun-Guang Lu
Subjects: Physics >> Nuclear Physics

The liquid scintillator (LS) has been widely utilized in the past, running and future neutrino experiments, and requirement to the LS radio-purity is higher and higher. The water extraction is a powerful method to remove soluble radioactive nuclei, and a mini-extraction station has been constructed. To evaluate the extraction efficiency and optimize the operation parameters, a setup to load radioactivity to LS and a laboratory scale setup to measure radioactivity which use Bi^{212}-Po^{212}-Pb^{208} cascade decay are developed. Experiences from laboratory study will be useful to large scale water extraction plants design and the optimization of working in future.

submitted time 2016-08-30 Hits1032Downloads593 Comment 0

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