Characterization of a 220Rn source for low-energy electronic recoil calibration 
of the XENONnT detector

Jörg, Florian; Li, Shengchao; Schreiner, Jochen; Simgen, Hardy; Lang, Rafael F.

doi:10.1088/1748-0221/18/11/P11009

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Characterization of a ²²⁰Rn source for low-energy electronic recoil calibration of the XENONnT detector

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Jörg, Florian
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;

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Schreiner, Jochen
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;

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Simgen, Hardy
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;

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引用

Jörg, F., Li, S., Schreiner, J., Simgen, H., & Lang, R. F. (2023). Characterization of a ²²⁰Rn source for low-energy electronic recoil calibration of the XENONnT detector. Journal of Instrumentation, 18:. doi:10.1088/1748-0221/18/11/P11009.

引用: https://hdl.handle.net/21.11116/0000-000D-F46E-5

要旨

Low-background liquid xenon detectors are utilized in the investigation of rare events, including dark matter and neutrinoless double beta decay. For their calibration, gaseous ²²⁰Rn can be used. After being introduced into the xenon, its progeny isotope²¹²Pb induces homogeneously distributed, low-energy (<30 keV) electronic recoil interactions. We report on the characterization of such a source for use in the XENONnT experiment. It consists of four commercially available ²²⁸Th sources with an activity of 55 kBq. These sources provide a high²²⁰Rn emanation rate of about 8 kBq. We find no indication for the release of the long-lived ²²⁸Th above 1.7 mBq. Though an unexpected ²²²Rn emanation rate of about 3.6 mBq is observed, this source is still in line with the requirements for the XENONnT experiment.