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1. chinaXiv:201609.01000 [pdf]

A parametrization of the cosmic-ray muon flux at sea-level

Mengyun Guan; Ming-Chung Chu; Jun Cao; Kam-Biu Luk; Changgen Yang
Subjects: Physics >> Nuclear Physics

Based on the standard Gaisser's formula, a modified parametrization for the sea-level cosmic-ray muon flux is introduced. The modification is verified against experimental results. The average vertical cosmic-ray muon intensity as a function of depth of standard rock is simulated using the modified formula as input to the MUSIC code. The calculated muon intensities is consistent with the experimental measurements.

submitted time 2016-09-14 Hits835Downloads501 Comment 0

2. chinaXiv:201609.00904 [pdf]

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?
Subjects: Physics >> Nuclear Physics

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.

submitted time 2016-09-13 Hits1044Downloads578 Comment 0

3. chinaXiv:201609.00903 [pdf]

Rayleigh scattering of linear alkylbenzene in large liquid scintillator detectors

Xiang Zhou; Qian Liu; Michael Wurm; Qingmin Zhang; Yayun Ding; Zhenyu Zhang; Yangheng Zheng; Li Zhou; Jun Cao; Yifang Wang
Subjects: Physics >> Nuclear Physics

Rayleigh scattering poses an intrinsic limit for the transparency of organic liquid scintillators. This work focuses on the Rayleigh scattering length of linear alkylbenzene (LAB), which will be used as the solvent of the liquid scintillator in the central detector of the Jiangmen Underground Neutrino Observatory. We investigate the anisotropy of the Rayleigh scattering in LAB, showing that the resulting Rayleigh scattering length will be significantly shorter than reported before. Given the same overall light attenuation, this will result in a more efficient transmission of photons through the scintillator, increasing the amount of light collected by the photosensors and thereby the energy resolution of the detector.

submitted time 2016-09-13 Hits1349Downloads741 Comment 0

4. 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 Hits959Downloads569 Comment 0

5. chinaXiv:201609.00051 [pdf]

An overview of the Daya Bay Reactor Neutrino Experiment

Jun Cao; Kam-Biu Luk
Subjects: Physics >> Nuclear Physics

The Daya Bay Reactor Neutrino Experiment discovered an unexpectedly large neutrino oscillation related to the mixing angle?θ13?in 2012. This finding paved the way to the next generation of neutrino oscillation experiments. In this article, we review the history, featured design, and scientific results of Daya Bay. Prospects of the experiment are also described.

submitted time 2016-09-05 Hits839Downloads429 Comment 0

6. chinaXiv:201609.00024 [pdf]

Radiation Studies for the Target Station of the MOMENT

Qing-Nian Xu; Jian-Fei Tong; Nikolaos Vassilopoulos; Jun Cao; Miao He; Zhi-Long Hou; Han-Tao Jing; Huai-Min Liu; Xiao-Rui yu; Jing-Yu Tang; Ye Yuan; Guang Zhao; Yang-Heng Zheng
Subjects: Physics >> Nuclear Physics

The discovery of the neutrino mixing angle?θ13?opens new opportunities for the discovery of the leptonic CP violation for high intensity neutrino beams. MOMENT a future neutrino facility with a high-power proton beam of 15 MW from a continuous-wave linac is focused on that discovery. The high power of the proton beam causes extreme radiation conditions for the facility and especially for the target station where the pion capture system of five superconducting solenoids is located. In this paper initial studies are performed for the effects of the radiation on the solenoid structure and the area surrounding it. A concept cooling system is also proposed.

submitted time 2016-09-02 Hits1034Downloads564 Comment 0

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