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PandaX-III: Searching for Neutrinoless Double Beta Decay with High Pressure ¹³⁶Xe Gas Time Projection Chambers

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arxiv 1610.08883 v2 pith:6RDYONER submitted 2016-10-27 physics.ins-det hep-exnucl-ex

PandaX-III: Searching for Neutrinoless Double Beta Decay with High Pressure ¹³⁶Xe Gas Time Projection Chambers

classification physics.ins-det hep-exnucl-ex
keywords willexperimentnldbdwaterbetachargedecaydetector
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Searching for the Neutrinoless Double Beta Decay (NLDBD) is now regarded as the topmost promising technique to explore the nature of neutrinos after the discovery of neutrino masses in oscillation experiments. PandaX-III (Particle And Astrophysical Xenon Experiment III) will search for the NLDBD of $^{136}$Xe at the China Jin Ping underground Laboratory (CJPL). In the first phase of the experiment, a high pressure gas Time Projection Chamber (TPC) will contain 200 kg, 90% $^{136}$Xe enriched gas operated at 10 bar. Fine pitch micro-pattern gas detector (Microbulk Micromegas) will be used at both ends of the TPC for the charge readout with a cathode in the middle. Charge signals can be used to reconstruct tracks of NLDBD events and provide good energy and spatial resolution. The detector will be immersed in a large water tank to ensure $\sim$5 m of water shielding in all directions. The second phase, a ton-scale experiment, will consist of five TPCs in the same water tank, with improved energy resolution and better control over backgrounds.

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  1. Statistical sensitivity of neutrinoless double-beta decay exchange mechanism discrimination by tracking experiments

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    Tracking detectors achieve 1σ mechanism discrimination in neutrinoless double-beta decay with a few events and 3σ with roughly 10 events, rising to about 25 events under realistic reconstruction uncertainties.