Material radiopurity control in the XENONnT experiment

分类： 天文学 >> 天文学 提交时间： 2023-02-19

E. Aprile K. Abe F. Agostini S. Ahmed Maouloud M. Alfonsi L. Althueser E. Angelino J. R. Angevaare V. C. Antochi D. Antón Martin F. Arneodo L. Baudis A. L. Baxter L. Bellagamba R. Biondi A. Bismark A. Brown S. Bruenner G. Bruno R. Budnik

摘要： The selection of low-radioactive construction materials is of the utmost importance for rare-event searches and thus critical to the XENONnT experiment. Results of an extensive radioassay program are reported, in which material samples have been screened with gamma-ray spectroscopy, mass spectrometry, and $^{222}$Rn emanation measurements. Furthermore, the cleanliness procedures applied to remove or mitigate surface contamination of detector materials are described. Screening results, used as inputs for a XENONnT Monte Carlo simulation, predict a reduction of materials background ($\sim$17%) with respect to its predecessor XENON1T. Through radon emanation measurements, the expected $^{222}$Rn activity concentration in XENONnT is determined to be 4.2$\,(^{+0.5}_{-0.7})\,\mu$Bq/kg, a factor three lower with respect to XENON1T. This radon concentration will be further suppressed by means of the novel radon distillation system.

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