PandaX-xT: a Multi-ten-tonne Liquid Xenon Observatory at the China Jinping Underground Laboratory
arxiv(2024)
摘要
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 ^136Xe 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.
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