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.; Peregrina, M. Medina; Michel, T.; Mong, B.; Moore, D. C.; Murray, K.; Nattress, J.; Natzke, C. R.; Newby, R. J.; Ni, K.; Nolet, F.; Nusair, O.; Ondze, J. Nzobadila; 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. 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.

doi:10.1088/1361-6471/ac3631

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

Journal Article · Fri Dec 03 00:00:00 EST 2021 · Journal of Physics. G, Nuclear and Particle Physics

DOI:https://doi.org/10.1088/1361-6471/ac3631· OSTI ID:1835825

Adhikari, G. ^[1]; 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. more »

Univ. of California, San Diego, CA (United States); nEXO Collaboration, et al.

Abstract 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.

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Research Organization:: Univ. of Alabama, Tuscaloosa, AL (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Yale Univ., New Haven, CT (United States); Stanford Univ., CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP); National Science Foundation (NSF); USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), High Energy Physics (HEP); USDOE Office of Nuclear Energy (NE)

Contributing Organization:: nEXO Collaboration

Grant/Contract Number:: FG02-01ER41166; AC05-00OR22725; SC0012704; SC0020438; AC52-07NA27344; AC02-76SF00515; SC0017970

OSTI ID:: 1835825

Alternate ID(s):: OSTI ID: 1837228; OSTI ID: 1860563; OSTI ID: 1860927; OSTI ID: 1862405; OSTI ID: 1871487; OSTI ID: 1903459; OSTI ID: 1992040

Report Number(s):: BNL-222524-2021-JAAM; LLNL-JRNL-826690; TRN: US2300264

Journal Information:: Journal of Physics. G, Nuclear and Particle Physics, Vol. 49, Issue 1; ISSN 0954-3899

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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