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

Journal Article · · Physical Review D
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.
Research Organization:
Brown Univ., Providence, RI (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); State Univ. of New York (SUNY), Albany, NY (United States); Univ. of Rochester, Rochester, NY (United States)
Sponsoring Organization:
Sanford Underground Research Facility (SURF); USDOE; USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), High Energy Physics (HEP); USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Organization:
LUX Collaboration
Grant/Contract Number:
AC02-05CH11231; AC02-76SF00515; AC05-06OR23100; AC52-07NA27344; FG02-08ER41549; FG02-91ER40674; FG02-91ER40688; FG02-95ER40917; NA0000979; SC0006605; SC0010010; SC0015535; SC0017891
OSTI ID:
1436669
Alternate ID(s):
OSTI ID: 1502026
OSTI ID: 1532649
OSTI ID: 1441120
OSTI ID: 1457784
OSTI ID: 3004598
Report Number(s):
LLNL-JRNL--752062; ark:/13030/qt9sx049qk
Journal Information:
Physical Review D, Journal Name: Physical Review D Journal Issue: 11 Vol. 97; ISSN PRVDAQ; ISSN 2470-0010
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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