NEXO：超越 10^{28} 年半衰期灵敏度的无中微子双贝塔衰变搜寻
核实验
2022-02-24 v2 仪器与探测器
摘要
nEXO 无中微子双贝塔衰变实验设计为使用时程投影室和 5000 kg 同位素富集的液态氙来搜寻 ^{136}Xe 中的该衰变。探测器设计的进展，加上更高保真度的模拟以及基于 EXO-200 最终结果所用方法的先进数据分析，产生了超过 10^{28} 年半衰期的灵敏度预测。具体而言，在闪烁光子和电荷的产生及其在探测器中的输运与重建的理解方面取得了进展。对探测器构造更详尽的认识已与更多针对不同材料中痕量放射性的检测相结合。特别是，设计中现已采用定制电铸铜，大幅降低了来自探测器材料本征放射性的本底。此外，先前灵敏度预测中的若干假设已获得验证 nEXO 实验概念的阶段性工作的进一步支持。综上这些改进与更新表明，nEXO 实验在 10 年取数后将在 90% 置信度下达到 1.35×10^{28} yr 的半衰期灵敏度，覆盖与反序中微子质量排序相关的参数空间，以及正常排序情景下绝大部分参数空间（对几乎所有核矩阵元而言）。文中还说明了本底偏离预测所用标称值的影响，结论是 nEXO 设计对模型的若干不完善具有鲁棒性。
引用
@article{arxiv.2106.16243,
title = {NEXO: Neutrinoless double beta decay search beyond $10^{28}$ year half-life sensitivity},
author = {nEXO Collaboration and G. Adhikari and S. Al Kharusi and E. Angelico and G. Anton and I. J. Arnquist and I. Badhrees and J. Bane and V. Belov and E. P. Bernard and T. Bhatta and A. Bolotnikov and P. A. Breur and J. P. Brodsky and E. Brown and T. Brunner and E. Caden and G. F. Cao and L. Cao and C. Chambers and B. Chana and S. A. Charlebois and D. Chernyak and M. Chiu and B. Cleveland and R. Collister and S. A. Czyz and J. Dalmasson and T. Daniels and L. Darroch and R. DeVoe and M. L. Di Vacri and J. Dilling and Y. Y. Ding and A. Dolgolenko and M. J. Dolinski and A. Dragone and J. Echevers and M. Elbeltagi and L. Fabris and D. Fairbank and W. Fairbank and J. Farine and S. Ferrara and S. Feyzbakhsh and Y. S. Fu and G. Gallina and P. Gautam and G. Giacomini and W. Gillis C. Gingras and D. Goeldi and R. Gornea and G. Gratta and C. A. Hardy and K. Harouaka and M. Heffner and E. W. Hoppe and A. House and A. Iverson and A. Jamil and M. Jewell and X. S. Jiang and A. Karelin and L. J. Kaufman and I. Kotov and R. Krücken and A. Kuchenkov and K. S. Kumar and Y. Lan and A. Larson and K. G. Leach and B. G. Lenardo and D. S. Leonard and G. Li and S. Li and Z. Li and C. Licciardi and R. Lindsay and R. MacLellan and M. Mahtab and P. Martel-Dion and J. Masbou and N. Massacret and T. McElroy and K. McMichael and M. Medina Peregrina and T. Michel and B. Mong and D. C. Moore and K. Murray and J. Nattress and C. R. Natzke and R. J. Newby and K. Ni and F. Nolet and O. Nusair and J. C. Nzobadila Ondze and K. Odgers and A. Odian and J. L. Orrell and G. S. Ortega and C. T. Overman and S. Parent and A. Perna and A. Piepke and A. Pocar and J-F. Pratte and N. Priel and V. Radeka and E. Raguzin and G. J. Ramonnye and T. Rao and H. Rasiwala and S. Rescia and F. Retière and J. Ringuette and V. Riot and T. Rossignol and P. C. Rowson and N. Roy and R. Saldanha and S. Sangiorgio and X. Shang and A. K. Soma and F. Spadoni and V. Stekhanov and X. L. Sun and M. Tarka and S. Thibado and A. Tidball and J. Todd and T. Totev and S. Triambak and R. H. M. Tsang and T. Tsang and F. Vachon and V. Veeraraghavan and S. Viel and C. Vivo-Vilches and P. Vogel and J-L. Vuilleumier and M. Wagenpfeil and T. Wager and M. Walent and K. Wamba and Q. Wang and W. Wei and L. J. Wen and U. Wichoski and S. Wilde and M. Worcester and S. X. Wu and W. H. Wu and X. Wu and Q. Xia and W. Yan and H. Yang and L. Yang and O. Zeldovich and J. Zhao and T. Ziegler},
journal= {arXiv preprint arXiv:2106.16243},
year = {2022}
}
备注
26 pages, 19 figures, version accepted by Journal of Phys. G