期刊
出版社
ELSEVIER
DOI: 10.1016/j.nima.2021.165239
关键词
Neutrinoless double beta decay; Liquid xenon detectors; Time-projection chambers; Monte Carlo methods
类别
资金
- Office of Nuclear Physics of the Department of Energy in the United States
- NSF in the United States
- NSERC in Canada
- CFI in Canada
- FRQNT in Canada
- NRC in Canada
- McDonald Institute (CFREF) in Canada
- Institute for Basic Science, Center for Underground Physics, Republic of Korea
- RFBR in Russia [18-02-00550]
- CAS in China
- NSFC in China
The nEXO experiment proposes the use of light originating in the skin LXe region to improve background discrimination by 5%. This improvement comes from removing a fraction of gamma-ray background and efficiently rejecting background from Rn-222 dissolved in the skin LXe by tagging the decay in the Bi-214-Po-214 chain in the skin LXe.
nEXO is a proposed tonne-scale neutrinoless double beta decay (0 nu beta beta) experiment using liquid Xe-136 (LXe) in a Time Projection Chamber (TPC) to read out ionization and scintillation signals. Between the field cage and the LXe vessel, a layer of LXe (``skin'' LXe) is present, where no ionization signal is collected. Only scintillation photons are detected, owing to the lack of optical barrier around the field cage. In this work, we show that the light originating in the skin LXe region can be used to improve background discrimination by 5% over previous published estimates. This improvement comes from two elements. First, a fraction of the gamma-ray background is removed by identifying light from interactions with an energy deposition in the skin LXe. Second, background from Rn-222 dissolved in the skin LXe can be efficiently rejected by tagging the.. decay in the Bi-214-Po-214 chain in the skin LXe.
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