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Title: First measurement of the ionization yield of nuclear recoils in liquid argon

Liquid phase argon has long been used as a target medium for particle detection via scintillation light. Recently there has been considerable interest in direct detection of both hypothetical darkmatter particles and coherent elastic neutrino nucleus scattering. These as-yet unobserved neutral particle interactions are expected to result in a recoiling argon atom O(keV), generally referred to in the literature as a nuclear recoil. This prompts the question of the available electromagnetic signal in a liquid argon detector. In this Letter we report the first measurement of the ionization yield (Qy), detected electrons per unit energy, resulting from nuclear recoils in liquid argon, measured at 6.7 keV. This is also the lowest energy measurement of nuclear recoils in liquid argon.
Authors:
 [1] ;  [2] ;  [3] ;  [3] ;  [3] ;  [4] ;  [3] ;  [5] ;  [3] ;  [3] ;  [1] ;  [2] ;  [3] ;  [3] ;  [3]
  1. Univ. of California, Berkeley, CA (United States). Dept. of Nuclear Engineering
  2. (LLNL), Livermore, CA (United States)
  3. Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
  4. (United States). Dept. of Mechanical and Nuclear Engineering
  5. Pennsylvania State Univ., University Park, PA (United States). Dept. of Mechanical and Nuclear Engineering
Publication Date:
OSTI Identifier:
1133217
Report Number(s):
PNNL-SA--100835
Journal ID: ISSN 0031-9007; NN2003000; TRN: US1400376
DOE Contract Number:
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 112; Journal Issue: 17
Publisher:
American Physical Society (APS)
Research Org:
Pacific Northwest National Laboratory (PNNL), Richland, WA (US)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY Nuclear Recoils; Liquid Argon; Liquid xenon; quazi-momenergetic; ; ; IONIZATION; ARGON