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Low Radioactive Material Screening and Background Control for the PandaX-4T Experiment

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arxiv 2112.02892 v2 pith:DGT6CZVU submitted 2021-12-06 physics.ins-det hep-ex

Low Radioactive Material Screening and Background Control for the PandaX-4T Experiment

classification physics.ins-det hep-ex
keywords backgroundpandax-4tmaterialdetectiondetectorestimatedexperimentmdru
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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PandaX-4T is a ton-scale dark matter direct detection experiment using a dual-phase TPC technique at the China Jinping Underground Laboratory. Various ultra-low background technologies have been developed and applied to material screening for PandaX-4T, including HPGe gamma spectroscopy, ICP-MS, NAA, radon emanation measurement system, krypton assay station, and alpha detection system. Low background materials were selected to assemble the detector. Surface treatment procedures were investigated to further suppress radioactive background. Combining measured results and Monte Carlo simulation, the total material background rates of PandaX-4T in the energy region of 1-25 keV$\rm{}_{ee}$ are estimated to be (9.9 $\pm$ 1.9) $\times \ 10^{-3}$ mDRU for electron recoil and (2.8 $\pm$ 0.6) $\times \ 10^{-4}$ mDRU for nuclear recoil. In addition, $^{nat}$Kr in the detector is estimated to be <8 ppt.

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  1. Measurement of solar $pp$ neutrino flux with the new PandaX-4T data

    hep-ex 2026-07 unverdicted novelty 4.0

    PandaX-4T Run 2 data yields solar pp neutrino flux of (8.5 ± 3.5)×10^{10} cm^{-2}s^{-1} at 2.2σ, first positive indication below 165 keV electronic recoil.