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Title: Measurement of the scintillation and ionization response of liquid xenon at MeV energies in the EXO-200 experiment

Journal Article · · Physical Review. C

Liquid xenon (LXe) is employed in a number of current and future detectors for rare event searches. We use the EXO-200 experimental data to measure the absolute scintillation and ionization yields generated by γ interactions from 228Th (2615 keV), 226Ra (1764 keV), and 60Co (1332 keV and 1173 keV) calibration sources, over a range of electric fields. The W value that defines the recombination-independent energy scale is measured to be 11.5 ± 0.5 (syst.) ±0.1 (stat.) eV. These data are also used to measure the recombination fluctuations in the number of electrons and photons produced by the calibration sources at the MeV scale, which deviate from extrapolations of lower-energy data. Additionally, a semiempirical model for the energy resolution of the detector is developed, which is used to constrain the recombination efficiency, i.e., the fraction of recombined electrons that result in the emission of a detectable photon. Detailed measurements of the absolute charge and light yields for MeV-scale electron recoils are important for predicting the performance of future neutrinoless double β-decay detectors.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Stanford Univ., CA (United States); Univ. of Alabama, Tuscaloosa, AL (United States)
Sponsoring Organization:
USDOE; National Science Foundtaion (NSF); Natural Sciences and Engineering Research Council of Canada (NSERC); Swiss National Science Foundation (SNF); Institute for Basic Science (IBS); Russian Foundation for Basic Research (RFBR); German Research Foundation (DFG); Chinese Academy of Sciences (CAS); International Science and Technology Cooperation Program of China (ISTCP)
Contributing Organization:
EXO-200 Collaboration
Grant/Contract Number:
AC02-76SF00515; SC0017970; FG02-01ER41166
OSTI ID:
1637652
Alternate ID(s):
OSTI ID: 1660464; OSTI ID: 1830778
Journal Information:
Physical Review. C, Vol. 101, Issue 6; ISSN 2469-9985
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 15 works
Citation information provided by
Web of Science

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