Event reconstruction in a liquid xenon Time Projection Chamber with an optically-open field cage

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Stiegler, T
Sangiorgio, S
Brodsky, JP
Heffner, M
Kharusi, SA
Anton, G
Arnquist, IJ
Badhrees, I
Barbeau, PS
Beck, D

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nEXO is a proposed tonne-scale neutrinoless double beta decay (0νββ) experiment using liquid 136Xe (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 γ-ray background is removed by identifying light from interactions with an energy deposition in the skin LXe. Second, background from 222Rn dissolved in the skin LXe can be efficiently rejected by tagging the α decay in the 214Bi-214Po chain in the skin LXe.





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Stiegler, T, S Sangiorgio, JP Brodsky, M Heffner, SA Kharusi, G Anton, IJ Arnquist, I Badhrees, et al. (2021). Event reconstruction in a liquid xenon Time Projection Chamber with an optically-open field cage. Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1000. pp. 165239–165239. 10.1016/j.nima.2021.165239 Retrieved from https://hdl.handle.net/10161/23995.

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Phillip S. Barbeau

Associate Professor of Physics

Professor Barbeau’s research interests are predominantly in the fields of neutrino and astroparticle physics. His efforts are focused on (but not limited to) three major areas of research: studying the physics of coherent neutrino-nucleus scattering; novel searches for the dark matter in our universe; and searches for zero neutrino double beta decay. The unifying aspect of the work is the common need for new and creative detector development in order to solve some of the “hard” problems in low-background rare-event detection.

Jens Dilling

Research Professor in the Department of Physics

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