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PandaX-xT: a Multi-ten-tonne Liquid Xenon Observatory at the China Jinping Underground Laboratory
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abstract
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.
Forward citations
Cited by 8 Pith papers
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Light Dark Matter Search with 7.8 Tonne-Year of Ionization-Only Data in XENONnT
An S2-only analysis of 7.83 tonne-years of XENONnT data finds no dark matter excess and sets 90% CL limits, e.g. 6.0e-45 cm^2 for spin-independent scattering at 5 GeV/c^2.
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Sensitivity of nEXO to $^{136}$Xe Charged-Current Interactions: Background-free Searches for Solar Neutrinos and Fermionic Dark Matter
A new delayed-coincidence tag from 136Cs isomers could let the nEXO detector reject backgrounds down to 10^-9 and measure CNO solar neutrinos, the 7Be neutrino energy, and sub-MeV fermionic dark matter.
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A Novel Low-Background Photomultiplier Tube Developed for Xenon Based Detectors
The R12699 PMT reaches ~0.08 mBq/PMT 60Co and ~0.06 mBq/PMT 238U late chain radioactivity, 15-fold lower than PandaX-4T's R11410, with cryogenic gain of 4.23e6 and 2.5 Hz dark count rate.
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AURORA: A High Performance Software DAQ Framework for Next-Generation Rare-Event Search Experiments
AURORA delivers a scalable DAQ system projected to exceed 3 GB/s throughput for experiments like PandaX-xT that generate up to 1.6 GB/s from 3000+ channels at 500 MSa/s.
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Sensitivity of neutrinoless double beta decays from a combined analysis of ground and excited states
Combined analysis of 0νββ decays to ground and excited states can significantly enhance experimental sensitivity depending on NME predictions.
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Radon Removal in XENONnT down to the Solar Neutrino Level
XENONnT reduced radon-222 in its liquid xenon target to 0.90 ± 0.07 micro-becquerel per kilogram, the lowest level reported for an operational dual-phase dark matter detector, matching the solar neutrino background.
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Dark Matter Escaping Direct Detection Runs into Higgs Mass Hierarchy Problem
TeV-scale Higgs-portal dark matter produces Higgs mass corrections larger than the measured Higgs mass, which excludes most such WIMPs except near half the Higgs mass.
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Revisiting CMSSM with Non-Universal Gaugino Masses under Current Constraints
Current data restrict the g~-SUGRA scenario to tanβ ≳ 5 and M0 ≳ 20 tanβ GeV, with large muon g-2 contributions difficult and future colliders needed to cover the remaining parameter space.
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