Lowering the radioactivity of the photomultiplier tubes for the XENON1T dark matter experiment

Aprile, E.; Agostini, F.; Alfonsi, M.; Arazi, L.; Arisaka, K.; Arneodo, F.; Auger, M.; Balan, C.; Barrow, P.; Baudis, L.; Bauermeister, B.; Behrens, A.; Beltrame, P.; Brown, A.; Brown, E.; Bruenner, S.; Bruno, G.; Budnik, R.; Bütikofer, Lukas; Cardoso, J. M. R.; ... (2015). Lowering the radioactivity of the photomultiplier tubes for the XENON1T dark matter experiment. European physical journal. C - particles and fields, 75(11) EDP Sciences 10.1140/epjc/s10052-015-3657-5

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The low-background, VUV-sensitive 3-inch diameter photomultiplier tube R11410 has been developed by Hamamatsu for dark matter direct detection experiments using liquid xenon as the target material. We present the results from the joint effort between the XENON collaboration and the Hamamatsu company to produce a highly radio-pure photosensor (version R11410-21) for the XENON1T dark matter experiment. After introducing the photosensor and its components, we show the methods and results of the radioactive contamination measurements of the individual materials employed in the photomultiplier production. We then discuss the adopted strategies to reduce the radioactivity of the various PMT versions. Finally, we detail the results from screening 286 tubes with ultra-low background germanium detectors, as well as their implications for the expected electronic and nuclear recoil background of the XENON1T experiment.

Item Type:

Journal Article (Original Article)

Division/Institute:

10 Strategic Research Centers > Albert Einstein Center for Fundamental Physics (AEC)
08 Faculty of Science > Physics Institute > Laboratory for High Energy Physics (LHEP)

UniBE Contributor:

Bütikofer, Lukas; Coderre, Daniel and Schumann, Marc

Subjects:

500 Science > 530 Physics

ISSN:

1434-6044

Publisher:

EDP Sciences

Language:

English

Submitter:

Marc Schumann

Date Deposited:

26 Apr 2016 16:55

Last Modified:

26 Apr 2016 16:55

Publisher DOI:

10.1140/epjc/s10052-015-3657-5

ArXiv ID:

1503.07698

BORIS DOI:

10.7892/boris.81236

URI:

https://boris.unibe.ch/id/eprint/81236

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