An Ultra-Low Background PMT for Liquid Xenon Detectors

Document Type

Article

Publication Date

2013

DOI

10.1016/j.nima.2012.11.020

Abstract

Results are presented from radioactivity screening of two models of photomultiplier tubes designed for use in current and future liquid xenon experiments. The Hamamatsu 5.6 cm diameter R8778 PMT, used in the LUX dark matter experiment, has yielded a positive detection of four common radioactive isotopes: 238U, 232Th, 40K, and 60Co. Screening of LUX materials has rendered backgrounds from other detector materials subdominant to the R8778 contribution. A prototype Hamamatsu 7.6 cm diameter R11410 MOD PMT has also been screened, with benchmark isotope counts measured at

Comments

Lead author: Daniel S. Akerib

Corresponding author: David Malling

Collaborations: LUX and LZ

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