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Title: Liquid xenon scintillation measurements and pulse shape discrimination in the LUX dark matter detector

Weakly Interacting Massive Particles (WIMPs) are a leading candidate for dark matter and are expected to produce nuclear recoil (NR) events within liquid xenon time-projection chambers. Here, we present a measurement of liquid xenon scintillation characteristics in the LUX dark matter detector and develop a pulse shaped based discrimination parameter to be used for particle identification. To accurately measure the scintillation characteristics, we develop a template-fitting method to reconstruct the detection time of photons. Analyzing calibration data collected during the 2013-16 LUX WIMP search, we measure a singlet-to-triplet scintillation ratio for electron recoils (ER) that is consistent with existing literature, and we make a first-ever measurement of the NR singlet-to-triplet ratio at recoil energies below 74 keV. A prompt fraction discrimination parameter exploits the difference of the photon time spectra for NR and ER events and is optimized to have the least number of ER events that occur in the 50% NR acceptance region. When this discriminator is used in conjunction with charge-to-light discrimination on the calibration data, the signal-to-noise ratio in the NR dark matter acceptance region increases by up to a factor of two.
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Publication Date:
Grant/Contract Number:
AC02-05CH11231; AC05-06OR23100; AC52-07NA27344; FG01-91ER40618; FG02- 08ER41549; FG02-11ER41738; FG02- 91ER40674; FG02-91ER40688; FG02- 95ER40917; NA0000979; SC0006605; SC0010010; SC0015535; PHY-0750671; PHY-0801536; PHY-1003660; PHY-1004661; PHY-1102470; PHY- 1312561; PHY-1347449; PHY-1505868; PHY- 1636738; PTDC/FIS-NUC/1525/2014; IE120804; ST/K502042/1; ST/K502406/1; ST/M503538/1; FG02-08ER41549; FG02-91ER40674; FG02-95ER40917; LLNL-JRNL-752062
Type:
Accepted Manuscript
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 97; Journal Issue: 11; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Research Org:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25); Sanford Underground Research Facility (SURF)
Contributing Orgs:
LUX Collaboration
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 79 ASTRONOMY AND ASTROPHYSICS
OSTI Identifier:
1436669
Alternate Identifier(s):
OSTI ID: 1441120