First Measurement of Discrimination between Helium and Electron Recoils in Liquid Xenon for Low-Mass Dark Matter Searches

Haselschwardt, S. J.; Gibbons, R.; Chen, H.; Kravitz, S.; Manalaysay, A.; Xia, Q.; Lippincott, W. H.; Sorensen, P.

doi:10.1103/PhysRevLett.132.111801

Title: First Measurement of Discrimination between Helium and Electron Recoils in Liquid Xenon for Low-Mass Dark Matter Searches

Journal Article · 13 March 2024 · Physical Review Letters

DOI: https://doi.org/10.1103/PhysRevLett.132.111801 · OSTI ID:2323960

;

; Chen, H.;

; Manalaysay, A.; Xia, Q.;

;

We report the first measurement of discrimination between low-energy helium recoils and electron recoils in liquid xenon. This result is relevant to proposed low-mass dark matter searches which seek to dissolve light target nuclei in the active volume of liquid-xenon time projection chambers. Low-energy helium recoils were produced by degrading $α$ particles from ${}^{210}{Po}$ with a gold foil situated on the cathode of a liquid xenon time-projection chamber. The resulting population of helium recoil events is well separated from electron recoils and is also offset from the expected position of xenon nuclear recoil events. Published by the American Physical Society 2024

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Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: AC02-05CH11231; SC0021115

OSTI ID:: 2323960

Alternate ID(s):: OSTI ID: 2426888

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 11 Vol. 132; ISSN 0031-9007; ISSN PRLTAO

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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