Published January 1, 2023 | Version Published
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Search for MeV electron recoils from dark matter in EXO-200

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 × 10⁻⁴ cts kg⁻¹ yr⁻¹ keV⁻¹ above 4 MeV and find no statistically significant excess over our background projection. Using a total ¹³⁶Xe exposure of 234.1 kg yr we exclude new parameter space for the charged-current absorption cross-section for dark matter masses between m_χ = 2.6−11.6 MeV with a minimum of 6 × 10⁻⁵¹ cm² at 8.3 MeV at the 90% confidence level.

Additional Information

Published by the American Physical Society under the terms of the 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. EXO-200 is supported by the DOE and NSF in the U.S., the NSERC in Canada, the SNF in Switzerland, the IBS in Korea, the DFG in Germany, and CAS and ISTCP in China. The EXO-200 data analysis and simulation use resources of the National Energy Research Scientific Computing Center. We gratefully acknowledge the KARMEN Collaboration for supplying the cosmic-ray veto detectors, as well as the WIPP for their hospitality.

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Published - PhysRevD.107.012007.pdf

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Identifiers

Eprint ID
120862
Resolver ID
CaltechAUTHORS:20230413-526384400.2

Related works

Funding

Department of Energy (DOE)
NSF
Natural Sciences and Engineering Research Council of Canada (NSERC)
Swiss National Science Foundation (SNSF)
Institute for Basic Science (Korea)
Deutsche Forschungsgemeinschaft (DFG)
Chinese Academy of Sciences
International Science and Technology Cooperation Programme
SCOAP3

Dates

Created
2023-05-16
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Updated
2023-05-16
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