Search for MeV electron recoils from dark matter in EXO-200

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Abstract

We present a search for electron-recoil signatures from the charged-current absorption of fermionic dark matter using the EXO-200 detector. We report an average electron-recoil background rate of 6.8×104 cts kg-1 yr-1 keV above 4 MeV and find no statistically significant excess over our background projection. Using a total Xe136 exposure of 234.1 kg yr, we exclude new parameter space for the charged-current absorption cross section for dark matter masses between mχ=2.6-11.6 MeV with a minimum of 6×1051 cm2 at 8.3 MeV at the 90% confidence level.

Original languageEnglish
Article number012007
JournalPhysical Review D
Volume107
Issue number1
DOIs
StatePublished - Jan 1 2023

Bibliographical note

Publisher Copyright:
© 2023 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3.

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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