PandaX实验的进展与展望

发布时间：2018-05-02 01:05

本文选题：暗物质 + PandaX　；参考：《原子核物理评论》2017年03期

【摘要】：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。Panda X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。Panda X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 Ge V/c~2附近,探测灵敏度达2.97×10~(-45)cm~2(90%置信度),没有发现WIMP疑似信号。本工作介绍了Panda X一期和二期的进展,以及后续升级计划,其中包括升级Panda X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~(136)Xe双贝塔衰变的研究计划等。
[Abstract]:PandaX is located in China's Jinping Underground Laboratory in Sichuan Province. Xenon is used as the working material to detect other extremely rare events such as dark matter. The xenon in the Panda X detector works in the gas-liquid two-phase mode. By detecting the ratio of flicker intensity in liquid phase and gas phase, the identification of suspected signals of target particles, including WIMP and Axion, has been successfully completed. Panda X has successfully completed the first phase of the effective region of about 120kg xenon. A phase II program with an active zone volume of about 500 kg xenon is currently in operation. When the mass of WIMP is near 45 GE V/c~2, the detection sensitivity is 2.97 脳 10 ~ (-1) -45 ~ (-1) cm ~ (-1) C ~ (2 +) with a confidence of 290%. No suspected WIMP signal was found. This paper introduces the progress of the first and second phases of Panda X, as well as the plans for further upgrading, including upgrading the time projection chamber to 4 tons of Panda X, constructing water shielding for shielding the radioactive background of rocks, and the research plan of double beta decay of 136X Xe.
【作者单位】：上海交通大学物理与天文学院粒子物理与核物理研究所;雅砻江水电发展有限公司;中国科学院上海应用物理研究所;马里兰大学物理系Collge
【基金】：国家自然科学基金(编号11375114,11435008,11455001,11505112,11525522) 科技部基金(2016YFA0400301)~~
【分类号】：P145.9

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