nEXO Collaboration, G. Adhikari, S. Al Kharusi, E. Angelico, G. Anton, I. J. Arnquist, I. Badhrees, J. Bane, V. Belov, E. P. Bernard, T. Bhatta, A. Bolotnikov, … 展开作者
nEXO Collaboration, G. Adhikari, S. Al Kharusi, E. Angelico, G. Anton, I. J. Arnquist, I. Badhrees, J. Bane, V. Belov, E. P. Bernard, T. Bhatta, A. Bolotnikov, P. A. Breur, J. P. Brodsky, E. Brown, T. Brunner, E. Caden, G. F. Cao, L. Cao, C. Chambers, B. Chana, S. A. Charlebois, D. Chernyak, M. Chiu, B. Cleveland, R. Collister, S. A. Czyz, J. Dalmasson, T. Daniels, L. Darroch, R. DeVoe, M. L. Di Vacri, J. Dilling, Y. Y. Ding, A. Dolgolenko, M. J. Dolinski, A. Dragone, J. Echevers, M. Elbeltagi, L. Fabris, D. Fairbank, W. Fairbank, J. Farine, S. Ferrara, S. Feyzbakhsh, Y. S. Fu, G. Gallina, P. Gautam, G. Giacomini, W. Gillis C. Gingras, D. Goeldi, R. Gornea, G. Gratta, C. A. Hardy, K. Harouaka, M. Heffner, E. W. Hoppe, A. House, A. Iverson, A. Jamil, M. Jewell, X. S. Jiang, A. Karelin, L. J. Kaufman, I. Kotov, 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, R. Lindsay, R. MacLellan, M. Mahtab, P. Martel-Dion, J. Masbou, N. Massacret, T. McElroy, K. McMichael, M. Medina Peregrina, T. Michel, B. Mong, D. C. Moore, K. Murray, J. Nattress, C. R. Natzke, R. J. Newby, K. Ni, F. Nolet, O. Nusair, J. C. Nzobadila Ondze, K. Odgers, A. Odian, J. L. Orrell, G. S. Ortega, C. T. Overman, S. Parent, A. Perna, A. Piepke, A. Pocar, J-F. Pratte, N. Priel, V. Radeka, E. Raguzin, G. J. Ramonnye, T. Rao, H. Rasiwala, S. Rescia, F. Retière, J. Ringuette, V. Riot, T. Rossignol, P. C. Rowson, N. Roy, R. Saldanha, S. Sangiorgio, X. Shang, A. K. Soma, F. Spadoni, V. Stekhanov, X. L. Sun, M. Tarka, S. Thibado, A. Tidball, J. Todd, T. Totev, S. Triambak, R. H. M. Tsang, T. Tsang, F. Vachon, V. Veeraraghavan, S. Viel, C. Vivo-Vilches, P. Vogel, J-L. Vuilleumier, M. Wagenpfeil, T. Wager, M. Walent, K. Wamba, Q. Wang, W. Wei, L. J. Wen, U. Wichoski, S. Wilde, M. Worcester, S. X. Wu, W. H. Wu, X. Wu, Q. Xia, W. Yan, H. Yang, L. Yang, O. Zeldovich, J. Zhao, T. Ziegler
备注：
26 pages, 19 figures, version accepted by Journal of Phys. G
The nEXO neutrinoless double beta decay experiment is designed to use a time projection chamber and 5000 kg of isotopically enriched liquid xenon to search for the decay in $^{136}$Xe. 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 $10^{28}$ 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 $1.35\times 10^{28}$ 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.
Experimental updates on development of accelerator-driven ion source at TRIUMF to benchmark Ba-tagging techniques for future neutrinoless double beta decay searches
TRIUMF（特柳姆夫国家粒子加速器中心）；Department of Physics and Astronomy, McMaster University（麦克马斯特大学物理与天文系）；Department of Physics and Physical Oceanography, University of North Carolina at Wilmington（北卡罗来纳大学威尔明顿分校物理与物理海洋学系）；Department of Physics, McGill University（麦吉尔大学物理系）；Department of Physics and Astronomy, University of Victoria（维多利亚大学物理与天文系）
Addendum to: QRPA uncertainties and their correlations in the analysis of neutrinoless double beta decay
在以前的文章[Phys. Rev. D 79，053001（2009）]中，我们在准粒子无规相位近似（QRPA）中估计了与无中微子双β衰变（0 nu β β）的核矩阵元（NME）相关的不确定性。这种估计包括最近对NME的独立计算，因此仍然可以提供核模型不确定性的公平代表。在这种情况下，我们比较了Ge-76中0 nu β β衰变的声明与最近在Ge-136和其他核中的负结果，并推断了在90% C. L.时允许或排除的寿命范围。我们还强调了一些问题，应加以解决，以适当地比较和结合来自不同的0 nu β β衰变候选核的结果。
