期刊
EUROPEAN PHYSICAL JOURNAL C
卷 82, 期 7, 页码 -出版社
SPRINGER
DOI: 10.1140/epjc/s10052-022-10345-6
关键词
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资金
- National Science Foundation
- Swiss National Science Foundation
- German Ministry for Education and Research
- Max Planck Gesellschaft
- Deutsche Forschungsgemeinschaft
- Helmholtz Association
- Dutch Research Council (NWO)
- Weizmann Institute of Science
- Israeli Science Foundation
- Fundacao para a Ciencia e a Tecnologia
- Region des Pays de la Loire
- Knut and Alice Wallenberg Foundation
- Kavli Foundation
- JSPS Kakenhi in Japan
- Istituto Nazionale di Fisica Nucleare
- European Union's Horizon 2020 research and innovation programme under the Marie Skodowska-Curie grant [860881-HIDDeN]
The selection of low-radioactive construction materials is crucial for the XENONnT experiment. Extensive radioassay program results show a reduction in materials background by about 17% compared to the predecessor, XENON1T. The expected Rn-222 activity concentration in XENONnT is determined to be three times lower than XENON1T, and it will be further reduced by a novel radon distillation system.
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 Rn-222 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 (similar to 17%) with respect to its predecessor XENON1T. Through radon emanation measurements, the expected Rn-222 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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