Search for MeV Electron Recoils from Dark Matter in EXO-200

S. Al Kharusi,G. Anton,I. Badhrees,P. S. Barbeau,D. Beck,V. Belov,T. Bhatta,M. Breidenbach,T. Brunner,G. F. Cao,W. R. Cen,C. Chambers,B. Cleveland,M. Coon,A. Craycraft,T. Daniels,L. Darroch,S. J. Daugherty, J. Davis,S. Delaquis,A. Der Mesrobian-Kabakian,R. DeVoe,J. Dilling,A. Dolgolenko,M. J. Dolinski,J. Echevers,W. Fairbank,D. Fairbank,J. Farine,S. Feyzbakhsh,P. Fierlinger,Y. S. Fu,D. Fudenberg,P. Gautam,R. Gornea,G. Gratta,C. Hall,E. V. Hansen,J. Hoessl,P. Hufschmidt,M. Hughes,A. Iverson,A. Jamil,C. Jessiman,M. J. Jewell,A. Johnson,A. Karelin,L. J. Kaufman,T. Koffas,R. Krucken,A. Kuchenkov,K. S. Kumar,Y. Lan, D. S. Larson,B. G. Lenardo,D. S. Leonard,G. S. Li,S. Li,Z. Li,C. Licciardi,Y. H. Lin,R. MacLellan,T. McElroy,T. Michel,B. Mong,D. C. Moore,K. Murray,O. Njoya,O. Nusair,A. Odian,I. Ostrovskiy,A. Perna,A. Piepke,A. Pocar,F. Retiere,A. L. Robinson,P. C. Rowson,D. Ruddell,J. Runge,S. Schmidt,D. Sinclair,K. Skarpaas,A. K. Soma,V. Stekhanov,M. Tarka,S. Thibado, M. Todd,T. Tolba,T. I. Totev,R. H. M. Tsang,B. Veenstra,V. Veeraraghavan,P. Vogel,J. -L. Vuilleumier,M. Wagenpfeil,J. Watkins,L. J. Wen,U. Wichoski,G. Wrede,S. X. Wu,Q. Xia,D. R. Yahne,L. Yang,Y. -R. Yen,O. Ya. Zeldovich,T. Ziegler

PHYSICAL REVIEW D（2023）

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摘要

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 x 104 cts kg-1 yr-1 keV 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 mx 1/4 2.6-11.6 MeV with a minimum of 6 x 1051 cm2 at 8.3 MeV at the 90% confidence level.

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