PandaX-xT: a Multi-ten-tonne Liquid Xenon Observatory at the China Jinping Underground Laboratory
Creators: name: PandaX Collaboration
name: Abdukerim, Abdusalam
name: Bo, Zihao
name: Chen, Wei
name: Chen, Xun
name: Cheng, Chen
name: Cheng, Zhaokan
name: Cui, Xiangyi
name: Fan, Yingjie
name: Fang, Deqing
name: Geng, Lisheng
name: Giboni, Karl
name: Gu, Linhui
name: Guo, Xunan
name: Guo, Xuyuan
name: Guo, Zhichao
name: Han, Chencheng
name: Han, Ke
name: He, Changda
name: He, Jinrong
name: Huang, Di
name: Huang, Junting
name: Huang, Zhou
name: Hou, Ruquan
name: Hou, Yu
name: Ji, Xiangdong
name: Ju, Yonglin
name: Li, Chenxiang
name: Li, Jiafu
name: Li, Mingchuan
name: Li, Shuaijie
name: Li, Tao
name: Lin, Qing
name: Liu, Jianglai
name: Lu, Congcong
name: Lu, Xiaoying
name: Luo, Lingyin
name: Luo, Yunyang
name: Ma, Wenbo
name: Ma, Yugang
name: Mao, Yajun
name: Meng, Yue
name: Ning, Xuyang
name: Pang, Binyu
name: Qi, Ningchun
name: Qian, Zhicheng
name: Ren, Xiangxiang
name: Shaheed, Nasir
name: Shang, Xiaofeng
name: Shao, Xiyuan
name: Shen, Guofang
name: Si, Lin
name: Sun, Wenliang
name: Tao, Yi
name: Wang, Anqing
name: Wang, Meng
name: Wang, Qiuhong
name: Wang, Shaobo
name: Wang, Siguang
name: Wang, Wei
name: Wang, Xiuli
name: Wang, Xu
name: Wang, Zhou
name: Wei, Yuehuan
name: Wu, Mengmeng
name: Wu, Weihao
name: Wu, Yuan
name: Xiao, Mengjiao
name: Xiao, Xiang
name: Yan, Binbin
name: Yan, Xiyu
name: Yang, Yong
name: Yu, Chunxu
name: Yuan, Ying
name: Yuan, Zhe
name: Yun, Youhui
name: Zeng, Xinning
name: Zhang, Minzhen
name: Zhang, Peng
name: Zhang, Shibo
name: Zhang, Shu
name: Zhang, Tao
name: Zhang, Wei
name: Zhang, Yang
name: Zhang, Yingxin
name: Zhang, Yuanyuan
name: Zhao, Li
name: Zhou, Jifang
name: Zhou, Ning
name: Zhou, Xiaopeng
name: Zhou, Yong
name: Zhou, Yubo
name: Zhou, Zhizhen
Publisher: name: arXiv
Year: 2024
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: We propose a major upgrade to the existing PandaX-4T experiment in the China Jinping Underground Laboratory. The new experiment, PandaX-xT, will be a multi-ten-tonne liquid xenon, ultra-low background, and general-purpose observatory. The full-scaled PandaX-xT contains a 43-tonne liquid xenon active target. Such an experiment will significantly advance our fundamental understanding of particle physics and astrophysics. The sensitivity of dark matter direct detection will be improved by nearly two orders of magnitude compared to the current best limits, approaching the so-called "neutrino floor" for a dark matter mass above 10 GeV/$c^2$, providing a decisive test to the Weakly Interacting Massive Particle paradigm. By searching for the neutrinoless double beta decay of $^{136}$Xe isotope in the detector, the effective Majorana neutrino mass can be measured to a [10 -- 41] meV/$c^2$ sensitivity, providing a key test to the Dirac/Majorana nature of neutrino s. Astrophysical neutrinos and other ultra-rare interactions can also be measured and searched for with an unprecedented background level, opening up new windows of discovery. Depending on the findings, PandaX-xT will seek the next stage upgrade utilizing isotopic separation on natural xenon.
description: version as published on SCPMA