Welcome to the new version of CaltechAUTHORS. Login is currently restricted to library staff. If you notice any issues, please email coda@library.caltech.edu
Published January 2022 | Submitted
Journal Article Open

nEXO: neutrinoless double beta decay search beyond 10²⁸ year half-life sensitivity

Adhikari, G.
Al Kharusi, S.
Angelico, E.
Anton, G.
Arnquist, I. J.
Badhrees, I.
Bane, J.
Belov, V.
Bernard, E. P.
Bhatta, T.
Bolotnikov, A.
Breur, P. A.
Brodsky, J. P.
Brown, E.
Brunner, T.
Caden, E.
Cao, G. F.
Cao, L.
Chambers, C.
Chana, B.
Charlebois, S. A.
Chernyak, D.
Chiu, M.
Cleveland, B.
Collister, R.
Czyz, S. A.
Dalmasson, J.
Daniels, T.
Darroch, L.
DeVoe, R.
Di Vacri, M. L.
Dilling, J.
Ding, Y. Y.
Dolgolenko, A.
Dolinski, M. J.
Dragone, A.
Echevers, J.
Elbeltagi, M.
Fabris, L.
Fairbank, D.
Fairbank, W.
Farine, J.
Ferrara, S.
Feyzbakhsh, S.
Fu, Y. S.
Gallina, G.
Gautam, P.
Giacomini, G.
Gillis, W.
Gingras, C.
Goeldi, D.
Gornea, R.
Gratta, G.
Hardy, C. A.
Harouaka, K.
Heffner, M.
Hoppe, E. W.
House, A.
Iverson, A.
Jamil, A.
Jewell, M.
Jiang, X. S.
Karelin, A.
Kaufman, L. J.
Kotov, I.
Krücken, R.
Kuchenkov, A.
Kumar, K. S.
Lan, Y.
Larson, A.
Leach, K. G.
Lenardo, B. G.
Leonard, D. S.
Li, G.
Li, S.
Li, Z.
Licciardi, C.
Lindsay, R.
MacLellan, R.
Mahtab, M.
Martel-Dion, P.
Masbou, J.
Massacret, N.
McElroy, T.
McMichael, K.
Medina Peregrina, M.
Michel, T.
Mong, B.
Moore, D. C.
Murray, K.
Nattress, J.
Natzke, C. R.
Newby, R. J.
Ni, K.
Nolet, F.
Nusair, O.
Nzobadila Ondze, J. C.
Odgers, K.
Odian, A.
Orrell, J. L.
Ortega, G. S.
Overman, C. T.
Parent, S.
Perna, A.
Piepke, A.
Pocar, A.
Pratte, J-F
Priel, N.
Radeka, V.
Raguzin, E.
Ramonnye, G. J.
Rao, T.
Rasiwala, H.
Rescia, S.
Retière, F.
Ringuette, J.
Riot, V.
Rossignol, T.
Rowson, P. C.
Roy, N.
Saldanha, R.
Sangiorgio, S.
Shang, X.
Soma, A. K.
Spadoni, F.
Stekhanov, V.
Sun, X. L.
Tarka, M.
Thibado, S.
Tidball, A.
Todd, J.
Totev, T.
Triambak, S.
Tsang, R. H. M.
Tsang, T.
Vachon, F.
Veeraraghavan, V.
Viel, S.
Vivo-Vilches, C.
Vogel, P.
Vuilleumier, J-L
Wagenpfeil, M.
Wager, T.
Walent, M.
Wamba, K.
Wang, Q.
Wei, W.
Wen, L. J.
Wichoski, U.
Wilde, S.
Worcester, M.
Wu, S. X.
Wu, W. H.
Wu, X.
Xia, Q.
Yan, W.
Yang, H.
Yang, L.
Zeldovich, O.
Zhao, J.
Ziegler, T.


The nEXO neutrinoless double beta (0νββ) decay experiment is designed to use a time projection chamber and 5000 kg of isotopically enriched liquid xenon to search for the decay in ¹³⁶Xe. Progress in the detector design, paired with higher fidelity in its simulation and an advanced data analysis, based on the one used for the final results of EXO-200, produce a sensitivity prediction that exceeds the half-life of 10²⁸ years. Specifically, improvements have been made in the understanding of production of scintillation photons and charge as well as of their transport and reconstruction in the detector. The more detailed knowledge of the detector construction has been paired with more assays for trace radioactivity in different materials. In particular, the use of custom electroformed copper is now incorporated in the design, leading to a substantial reduction in backgrounds from the intrinsic radioactivity of detector materials. Furthermore, a number of assumptions from previous sensitivity projections have gained further support from interim work validating the nEXO experiment concept. Together these improvements and updates suggest that the nEXO experiment will reach a half-life sensitivity of 1.35 × 10²⁸ yr at 90% confidence level in 10 years of data taking, covering the parameter space associated with the inverted neutrino mass ordering, along with a significant portion of the parameter space for the normal ordering scenario, for almost all nuclear matrix elements. The effects of backgrounds deviating from the nominal values used for the projections are also illustrated, concluding that the nEXO design is robust against a number of imperfections of the model.

Additional Information

© 2021 IOP Publishing Ltd. Received 6 August 2021; Revised 21 October 2021; Accepted 3 November 2021; Published 3 December 2021. The authors gratefully acknowledge support for nEXO from the Office of Nuclear Physics within DOE's Office of Science, and NSF in the United States; from NSERC, CFI, FRQNT, NRC, and the McDonald Institute (CFREF) in Canada; from IBS in Korea; from RFBR in Russia; and from CAS and NSFC in China. This work was supported in part by Laboratory Directed Research and Development (LDRD) programs at Brookhaven National Laboratory (BNL), Lawrence Livermore National Laboratory (LLNL), Oak Ridge National Laboratory (ORNL), Pacific Northwest National Laboratory (PNNL), and SLAC National Accelerator Laboratory.

Attached Files

Submitted - 2106.16243.pdf


Files (5.7 MB)
Name Size Download all
5.7 MB Preview Download

Additional details

August 22, 2023
August 22, 2023