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

T. Stiegler, S. Sangiorgio, J. P. Brodsky, M. Heffner, S. Al Kharusi, G. Anton, I. J. Arnquist, I. Badhrees, P. S. Barbeau, D. Beck, V. Belov, T. Bhatta, A. Bolotnikov, P. A. Breur, E. Brown, T. Brunner, E. Caden, G. F. Cao, L. Cao, C. ChambersB. Chana, S. A. Charlebois, M. Chiu, B. Cleveland, M. Coon, A. Craycraft, J. Dalmasson, T. Daniels, L. Darroch, A. De, A. Der Mesrobian-Kabakian, K. Deslandes, R. DeVoe, M. L. Di Vacri, J. Dilling, Y. Y. Ding, M. J. Dolinski, A. Dragone, J. Echevers, F. Edaltafar, M. Elbeltagi, L. Fabris, D. Fairbank, W. Fairbank, J. Farine, S. Ferrara, S. Feyzbakhsh, G. Gallina, P. Gautam, G. Giacomini, D. Goeldi, R. Gornea, G. Gratta, E. V. Hansen, E. W. Hoppe, J. Hößl, A. House, M. Hughes, A. Iverson, A. Jamil, M. J. Jewell, X. S. Jiang, A. Karelin, L. J. Kaufman, T. Koffas, R. Krücken, A. Kuchenkov, K. S. Kumar, Y. Lan, A. Larson, K. G. Leach, B. G. Lenardo, D. S. Leonard, G. Li, S. Li, Z. Li, C. Licciardi, P. Lv, R. MacLellan, N. Massacret, T. McElroy, M. Medina-Peregrina, T. Michel, B. Mong, D. C. Moore, K. Murray, P. Nakarmi, C. R. Natzke, R. J. Newby, K. Ni, Z. Ning, O. Njoya, F. Nolet, O. Nusair, K. Odgers, A. Odian, M. Oriunno, J. L. Orrell, G. S. Ortega, I. Ostrovskiy, C. T. Overman, S. Parent, A. Piepke, A. Pocar, J. F. Pratte, V. Radeka, E. Raguzin, H. Rasiwala, S. Rescia, F. Retière, M. Richman, A. Robinson, T. Rossignol, P. C. Rowson, N. Roy, R. Saldanha, K. Skarpaas, A. K. Soma, G. St-Hilaire, V. Stekhanov, X. L. Sun, M. Tarka, S. Thibado, A. Tidball, J. Todd, T. I. Totev, R. Tsang, T. Tsang, F. Vachon, V. Veeraraghavan, S. Viel, G. Visser, C. Vivo-Vilches, J. L. Vuilleumier, M. Wagenpfeil, T. Wager, M. Walent, Q. Wang, W. Wei, L. J. Wen, U. Wichoski, M. Worcester, S. X. Wu, W. H. Wu, X. Wu, Q. Xia, H. Yang, L. Yang, O. Zeldovich, J. Zhao, Y. Zhou, T. Ziegler

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


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.

Original languageEnglish
Article number165239
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
StatePublished - Jun 1 2021

Bibliographical note

Funding Information:
Support for nEXO comes from the Office of Nuclear Physics of the Department of Energy and NSF in the United States, from NSERC , CFI , FRQNT , NRC , and the McDonald Institute (CFREF) in Canada, from The Institute for Basic Science, Center for Underground Physics, Republic of Korea , from RFBR ( 18-02-00550 ) in Russia, and from CAS and NSFC in China. LLNL-JRNL-814563.

Publisher Copyright:
© 2021 Elsevier B.V.


  • Liquid xenon detectors
  • Monte Carlo methods
  • Neutrinoless double beta decay
  • Time-projection chambers

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation


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