PandaX: Particle and Astrophysical Xenon Experiments

PandaX is a series of experimental projects that utilizes Xenon detectors to search for elusive dark matter particles and to understand the fundamental properties of neutrinos. The PandaX collaboration has now entered into the multi-ton stage of the project, PandaX-4T.

PandaX-II is a dark matter direct detection experiment equipped with a half-ton scale dual-phase time projection chamber (TPC), operated in CJPL between Oct. 2014 and June 2019. In 2016 and 2017, PandaX-II produced the world leading constraints to dark matter-nucleon interactions. See a list of scientific publications here.

With 6-ton of total Xenon and 4-ton sensitive target, PandaX-4T aims to improve the dark matter sensitivity by one order of magnitude in comparison to PandaX-II. PandaX-4T also plans to make sensitive searches on neutrinoless double beta decay of ${}^{136}Xe$ , and other signals from new physics. This project is expected to commence data taking in 2021.

PandaX-III searches for the possible neutrinoless double beta decay with 200 kg to one ton of 90% enriched ${}^{136}Xe$ in a high pressure gaseous Xenon TPC.

News

• On December 24, 2021, the first dark matter search result from PandaX-4T, a liquid xenon detection experiment, was published in Physical Review Letters as the "Editor's Suggestion" [1]. The American Physical Society 《Physics》 reported this PandaX-4T latest result together with another result from the Axion Dark Matter Experiment with a title of "Tightening the Net on Two Kinds of Dark Matter"

• A new result on searching of light dark matter (DM) with PandaX-II experimental data was published online in Physical Review Letters on May 28, 2021 with a title of "Search for Light Dark Matter–Electron Scattering in the PandaX-II Experiment "[1]. This is the 6th PRL paper published with PandaX-II data.

• The PandaX-II experiment is completed and the PandaX-4T experiment is under installation. The future PandaX program will focus on the following two main directions:

1. Develop PandaX-4T into a multi-purpose liquid xenon experiment, to push further the dark matter search and other physics topics;
2. Develop and operate a 100-kg high pressure gas TPC (HpgTPC), PandaX-III, as a pathfinder for a tracking calorimeter to search for $0\nu\beta\beta$ in ${}^{136}Xe$.

Hello 2021!

The full International Advisory Committee 2020 Report.
• The PandaX collaboration released the latest results on the search of WIMPs and axions based on the full exposure of data at the International High Energy Physics Conference (ichep2020) on July 30, 2020. Detailed analyses were reported with an online seminar on August 20. The most stringent constraint is set for WIMPs around 10 GeV/c2 using the nuclear recoil events. The intriguing electron recoil event excess observed by XENON1T [1] was tested with the electron recoil data, and was found to be within the constraint of the PandaX-II data.
• New results on the detection of axions and galaxy axion-like particles(ALPs) with 80 day of PandaX-II data were published online in Physical Review Letters on Nov 1, 2017 (on the same issue with another PandaX-II paper on 54 ton-day WIMP search results).

Events

• Saturday, January 9, 2021 - 08:00
T. D. Lee Library

上海市物理学会粒子物理与核物理专委会及上海市核学会核物理专委会计划于2021年1月8日-10日在上海夏阳湖皇冠假日酒店举行2020年度联合学术交流会暨粒子物理与核物理上海研讨会，欢迎两个专委会的同事以及相关团队成员参会，开展学术交流；会议也将邀请国内有关专家参会交流。

• Saturday, January 4, 2020 - 08:00
Xichang
• Saturday, December 14, 2019 - 13:00
T. D. Lee Library