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PandaX是位于四川的中国锦屏地下实验室(CJPL)内的,利用氙作为工作物质,探测暗物质等其它极稀有事件的大型地下粒子探测实验计划。PandaX探测器中的氙工作在气液两相的模式。通过检测液相和气相中闪烁光强的比例,实现对目标粒子包括WIMP和Axion等疑似信号的鉴别。PandaX已顺利完成了有效区体积约为120 kg氙的一期计划,目前正在运行实施有效区体积约为500 kg氙的二期计划。在WIMP质量为45 GeV/c2附近,探测灵敏度达2.97×10-45 cm2(90%置信度),没有发现WIMP疑似信号。本工作介绍了PandaX一期和二期的进展,以及后续升级计划,其中包括升级PandaX的时间投影室至4吨,建造用于屏蔽岩石放射性本底的水屏蔽,以及136Xe双贝塔衰变的研究计划等。PandaX is a xenon-based dark matter and other rare events searching project located at China JinPing underground Laboratory (CJPL), Sichuan province, China. Dual phases, liquid and gas phase of xenon are used in the detector. Particles, including Weak Interaction Massive Particles (WIMPs) or axions etc., may induce scintillating signals in both liquid (S1 signal) and gas (S2 signal) phases, and then are identified by analyzing the ratio of S1 and S2. The PandaX had completed its first stage, the 120 kg in fiducial volume, and now is running in its stage Ⅱ with fiducial volume of 500 kg. The running results show that the WIMP-matter cross section detecting sensitivity of about 2.97×10-45 cm2(90% C.L.) has been achieved at a WIMP mass of 44.7 GeV/c2, and no WIMP candidates are identified. The upgrading plan of the PandaX is discussed, which include to build a larger Time project chamber (TPC) of about 4 tons, a water tank for radiation shielding, and the plan of 136Xe double beta decay studies.  相似文献   
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本文研究了熔融织构块材和单晶YBa2Cu3O7在液氮温区63~75K的磁弛豫性质.在此温区常数ωa是与温度相关的,平均有效结合能作为电流密度的函数和Zeldov模型一致.  相似文献   
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周小朋  曾鑫宁  宁旭阳  阿布都沙拉木·阿布都克力木  陈葳  谌勋  陈云华  程晨  崔祥仪  樊英杰  方德清  符长波  付孟婷  耿立升  Karl Giboni  顾琳慧  郭绪元  韩柯  何昶达  黄迪  黄焱  黄彦霖  黄周  季向东  巨永林  李帅杰  刘华萱  刘江来  芦晓盈  马文博  马余刚  冒亚军  孟月  倪恺翔  宁金华  任祥祥  商长松  申国防  司琳  谈安迪  王安庆  王宏伟  王萌  王秋红  王思广  王为  王秀丽  王舟  武蒙蒙  吴世勇  邬维浩  夏经铠  肖梦姣  谢鹏伟  燕斌斌  杨继军  杨勇  喻纯旭  袁鞠敏  袁影  张丹  张涛  赵力  郑其斌  周济芳  周宁 《中国物理快报》2021,(1):30-34
We report a search for new physics signals using the low energy electron recoil events in the complete data set from PandaX-Ⅱ,in light of the recent event excess reported by XENON1 T.The data correspond to a total exposure of 100.7 ton·day with liquid xenon.With robust estimates of the dominant background spectra,we perform sensitive searches on solar axions and neutrinos with enhanced magnetic moment.It is found that the axionelectron coupling gAe<4.6×10-12 for an axion mass less than 0.1 keV/c2 and the neutrino magnetic moment μv<4.9×10-11μB at 90%confidence level.The observed excess from XENON1 T is within our experimental constraints.  相似文献   
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