Abstract
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 136Xe 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% 136Xe 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 the electron tracks of the NLDBD events and provide good energy and spatial resolution. The detector will be immersed in a large water tank to ensure ~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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Acknowledgments
This work was supported by the National Key Programme for Research and Development (NKPRD) (Grant No. 2016YFA0400300). The authors thank Shanghai Jiao Tong University (SJTU) for their financial and technical support. We also appreciate technical and administrative assistance from China Jin Ping Underground Laboratory (CJPL). The authors especially thank Xiang Xiao, a former graduate student at the SJTU group, who made significant contribution to the design and construction of the prototype TPC. Much of the R&D work on low background Microbulk Micromegas readout on which this proposal is based has been performed by the Zaragoza group under the T-REX project, funded by the European Research Council (Grant No. ERC-2009-StG-240054).
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Chen, X., Fu, C., Galan, J. et al. PandaX-III: Searching for neutrinoless double beta decay with high pressure 136Xe gas time projection chambers. Sci. China Phys. Mech. Astron. 60, 061011 (2017). https://doi.org/10.1007/s11433-017-9028-0
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DOI: https://doi.org/10.1007/s11433-017-9028-0