|
| | | | |
| | | |
| Stat |
Members: 3644
Articles: 2'499'343
Articles rated: 2609
16 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
An Ultra-Low Background PMT for Liquid Xenon Detectors | | D.S. Akerib
; X. Bai
; E. Bernard
; A. Bernstein
; A. Bradley
; D. Byram
; S.B. Cahn
; M.C. Carmona-Benitez
; D. Carr
; J.J. Chapman
; Y-D. Chan
; K. Clark
; T. Coffey
; L. deViveiros
; M. Dragowsky
; E. Druszkiewicz
; B. Edwards
; C. H. Faham
; S. Fiorucci
; R. J. Gaitskell
; K. R. Gibson
; C. Hall
; M. Hanhardt
; B. Holbrook
; M. Ihm
; R.G. Jacobsen
; L. Kastens
; K. Kazkaz
; N. Larsen
; C. Lee
; K. Lesko
; A. Lindote
; M. I. Lopes
; A. Lyashenko
; D. C. Malling
; R. Mannino
; D. McKinsey
; D. Mei
; J. Mock
; M. Morii
; H. Nelson
; F. Neves
; J.A. Nikkel
; M. Pangilinan
; K. Pech
; P. Phelps
; T. Shutt
; C. Silva
; W. Skulski
; V.N. Solovov
; P. Sorensen
; J. Spaans
; T. Stiegler
; M. Sweany
; M. Szydagis
; D. Taylor
; J. Thomson
; M. Tripathi
; S. Uvarov
; J.R. Verbus
; N. Walsh
; R. Webb
; J. T. White
; M. Wlasenko
; F. L. H. Wolfs
; M. Woods
; C. Zhang
; | | Date: |
10 May 2012 | | 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 <0.4 238 U / <0.3 232
Th / <8.3 40 K / 2.0+-0.2 60 Co mBq/PMT. This represents a large reduction,
equal to a change of imes 1/24 238U / imes 1/9 232Th / imes 1/8 40K per
PMT, between R8778 and R11410 MOD, concurrent with a doubling of the
photocathode surface area (4.5 cm to 6.4 cm diameter). 60Co measurements are
comparable between the PMTs, but can be significantly reduced in future R11410
MOD units through further material selection. Assuming PMT activity equal to
the measured 90% upper limits, Monte Carlo estimates indicate that replacement
of R8778 PMTs with R11410 MOD PMTs will change LUX PMT electron recoil
background contributions by a factor of imes1/25 after further material
selection for 60Co reduction, and nuclear recoil backgrounds by a factor of
imes 1/36. The strong reduction in backgrounds below the measured R8778
levels makes the R11410 MOD a very competitive technology for use in
large-scale liquid xenon detectors. | | Source: | arXiv, 1205.2272 | | Services: | Forum | Review | PDF | Favorites | |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser claudebot
|
| |
|
|
|
|
News, job offers and information for researchers and scientists:
| |
REGISTER