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Configurational Entropy, Diffusivity and Potential Energy Landscape in liquid argon

Chinese Physics Letters 2009年第1期26卷 220-222页

作者：段永平马丛笑李佳云李丛王丹李美丽孙民华 Heilongjiang Key Laboratory for Advanced Functional Materials and Excited State Process School of Physics and Electronic Engineering Harbin Normal University Harbin 150025

The configurational entropy, diffusion eoefficient, dynamics and thermodynamics fragility indices of liquid argon are calculated using molecular dynamics simulations at two densities. The relationship between dynamics and thermodynamics properties is studied. The diffusion coefficient depends linearly on configurational entropy, which is consistent with the hypothesis of Adam Gibbs. The consistence of dynamics and thermodynamics fragility indices demonstrates that dynamical behaviour is governed by thermodynamics behaviour in glass transition of liquid argon.

关键词： liquid argon ENTROPY DIFFUSION POTENTIAL energy surfaces THERMODYNAMICS MOLECULAR dynamics

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Measurement of photoelectron yield of the CDEX-10 liquid argon detector prototype

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Chinese Physics C 2016年第11期40卷 114-119页

作者：陈庆豪岳骞程建平康克军李元景林兴德唐昌建幸浩洋余训臻曾鸣朱敬军 Department of Engineering Physics Tsinghua University Key Laboratory of Particle and Radiation Imaging Tsinghua UniversityMinistry of Education College of Physical Science and Technology Sichuan University

The China Dark Matter Experiment （CDEX） is a low background experiment at China Jinping Under- ground Laboratory （CJPL） designed to directly detect dark matter with a high-purity germanium （HPGe） detector. In the second phase, CDEX-10, which has a 10 kg germanium array detector system, a liquid argon （LAr） anti- Compton active shielding and cooling system is proposed. To study the properties of the LAr detector, a prototype with an active volume of 7 liters of liquid argon was built and operated. The photoelectron yields, as a critically important parameter for the prototype detector, have been measured to be 0.051-0.079 p.e./keV for 662 keV γ rays at different positions. The good agreement between the experimental and simulation results has provided a reasonable understanding and determination of the important parameters such as the surviving fraction of the Ar2 excimers, the absorption length for 128 nm photons in liquid argon, the reflectivity of Teflon and so on.

关键词： dark matter liquid argon photoelectron yield wavelength shifter TPB

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Study of the material photon and electron background and the liquid argon detector veto efficiency of the CDEX-10 experiment

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Chinese Physics C 2015年第3期39卷 30-37页

作者：苏健曾志马豪岳骞程建平常建平陈楠陈宁陈庆豪陈云华庄又澄邓智杜强宫辉郝喜庆何庆驹黄瀚雄黄腾锐江灏康克军李浩斌李荐民李金李军李霞李新颖李学潜李玉兰李元景廖恒毅林枫凯林欣德刘书魁吕岚春毛绍基覃建强任杰任婧阮锡超申满斌 SINGH Lakhwinder SINGH Manoj Kumar SOMA Arun Kumar 唐昌建曾昭雄王继敏王力王青王子敬吴世勇吴玉成幸浩洋徐音薛涛杨丽桃杨松纬易难喻纯旭于昊余训臻曾雄辉张岚张蕴华赵明刚赵伟周祖英朱敬军朱维彬朱雪洲朱忠华 Key Laboratory of Particle and Radiation Imaging (Ministry of Education) and Department of Engineering Physics Tsinghua University Beijing 100084 China China Institute of Atomic Energy Beijing 102413 China Nankai University Tianjin 300071 China NUCTECH Company Beijing 100084 China Sichuan University Chengdu 610065 China Yalong River Hydropower Development Company Chengdu 610051 China Department of Physics Banaras Hindu University Varanasi 221005 India

The China Dark Matter Experiment （CDEX） is located at the China Jinping Underground Laboratory （CJPL） and aims to directly detect the weakly interacting massive particles （WIMP） flux with high sensitivity in the low mass region. Here we present a study of tile predicted photon and electron backgrounds including the background contribution of the structure materials of the germanium detector, the passive shielding materials, and the intrinsic radioactivity of the liquid argon that serves as an anti-Compton active shielding detector. A detailed geometry is modeled and the background contribution has been simulated based on the measured radioactivities of all possible components within tile GEANT4 program. Then the photon and electron background level in the energy region of interest （〈10-2events-kg1·day 1·keV-1 （cpkkd）） is predicted based on Monte Carlo simulations. The simulated result is consistent with the design goal of the CDEX-10 experiment, 0.1cpkkd, which shows that the active and passive shield design of CDEX-10 is effective and feasible.

关键词： CDEX-IO material photon and electron background germanium detector liquid argon veto coincidentcut Monte Carlo simulation

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Calibration of liquid argon detector with ^(83m)Kr and ^(22)Na in different drift fields

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Radiation Detection Technology and Methods 2020年第2期4卷 147-152页

作者： Wei-Xing Xiong Meng-Yun Guan Chang-Gen Yang Peng Zhang Jin-Chang Liu Cong Guo Yu-Ting Wei You-Yu Gan Qing Zhao Jia-Jun Li Institute of High Energy Physics Beijing 100049China University of Chinese Academy of Sciences Beijing 100049China North China Electric Power University Beijing 100096China

Introduction liquid noble gases are widely used as targets in low background search experiments,particularly in direct dark matter search experiments.83mKr is an excellent low-energy internal calibration source for future larger liquid noble gas *** To calibrate liquid argon detector with 83mKr in different drift fields and to study the correlation between light yield and drift *** A dual-phase LAr prototype detector was designed to study the 83mKr responses in liquid argon.83mKr atoms are produced through the decay of 83Rb and introduced into the LAr detector through the circulating purification *** We report that the light yield reaches 7.26±0.02 pe/keV for 41.5 keV from 83mKr and 7.66±0.01 pe/keV for 511 keV from 22Na,as a *** stopping the fill,the rate decays of 83mKr are with a fitted half-life of 1.83±0.11 h,which is consistent with the reported value of 1.83±0.02 *** light yield that varies with the drift electric field from 0 to 200 V/cm has also been reported.

关键词： Time projection chamber Noble liquid detectors Light yield liquid argon

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