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Collaboration, LUX, Akerib, DS, Alsum, S et al. (94 more authors) (2020) Discrimination of electronic recoils from nuclear recoils in two-phase xenon time projection chambers. Physical Review D, 102 (11). 112002. ISSN 2470-0010
Abstract
We present a comprehensive analysis of electronic recoil vs. nuclear recoil discrimination in liquid/gas xenon time projection chambers, using calibration data from the 2013 and 2014-16 runs of the Large Underground Xenon (LUX) experiment. We observe strong charge-to-light discrimination enhancement with increased event energy. For events with S1 = 120 detected photons, i.e. equivalent to a nuclear recoil energy of ∼100 keV, we observe an electronic recoil background acceptance of <10−5 at a nuclear recoil signal acceptance of 50%. We also observe modest electric field dependence of the discrimination power, which peaks at a field of around 300 V/cm over the range of fields explored in this study (50-500 V/cm). In the WIMP search region of S1 = 1-80 phd, the minimum electronic recoil leakage we observe is (7.3±0.6)×10−4, which is obtained for a drift field of 240-290 V/cm. Pulse shape discrimination is utilized to improve our results, and we find that, at low energies and low fields, there is an additional reduction in background leakage by a factor of up to 3. We develop an empirical model for recombination fluctuations which, when used alongside the Noble Element Scintillation Technique (NEST) simulation package, correctly reproduces the skewness of the electronic recoil data. We use this updated simulation to study the width of the electronic recoil band, finding that its dominant contribution comes from electron-ion recombination fluctuations, followed in magnitude of contribution by fluctuations in the S1 signal, fluctuations in the S2 signal, and fluctuations in the total number of quanta produced for a given energy deposition.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2020 American Physical Society. This is an author-produced version of a paper subsequently published in Physical Review D. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | physics.ins-det; physics.ins-det; hep-ex; nucl-ex |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Science (Sheffield) > Department of Physics and Astronomy (Sheffield) |
Funding Information: | Funder Grant number Science and Technology Facilities Council ST/M003469/1 Science and Technology Facilities Council ST/N001141/1 Science and Technology Facilities Council ST/P00573X/1 Science and Technology Facilities Council ST/N000277/1 Science and Technology Facilities Council ST/S000747/1 |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 27 Nov 2020 13:37 |
Last Modified: | 01 Nov 2022 16:57 |
Status: | Published |
Publisher: | American Physical Society |
Refereed: | Yes |
Identification Number: | 10.1103/PhysRevD.102.112002 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:168488 |
Available Versions of this Item
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Discrimination of electronic recoils from nuclear recoils in two-phase xenon time projection chambers. (deposited 01 Nov 2022 16:36)
- Discrimination of electronic recoils from nuclear recoils in two-phase xenon time projection chambers. (deposited 27 Nov 2020 13:37) [Currently Displayed]