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- W4286560972 abstract "High-energy photons with $mathcal{O}$(MeV) energies from radioactive contaminants can scatter in a solid-state target material and constitute an important low-energy background for sub-GeV dark matter direct-detection searches. This background is most noticeable for energy deposits in the $1 - 100$ meV range due to the partially coherent scattering enhancement in the forward scattering direction. We comprehensively quantify the resulting single- and multi-phonon background in Si, Ge, GaAs, SiC, and Al$_2$O$_3$ target materials, which are representative of target materials of interest in low-mass dark matter searches. We use a realistic representation of the high-energy photon background, and contrast the expected background phonon spectrum with the expected dark matter signal phonon spectrum. An active veto is needed to suppress this background sufficiently in order to allow for the detection of a dark matter signal, even in well-shielded environments. For comparison we also show the expected single- and multi-phonon event rates from coherent neutrino-nucleus scattering due to solar neutrinos, and find that they are sub-dominant to the photon-induced phonon background." @default.
- W4286560972 created "2022-07-22" @default.
- W4286560972 creator A5025195352 @default.
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- W4286560972 date "2022-07-22" @default.
- W4286560972 modified "2023-10-15" @default.
- W4286560972 title "Phonon background from gamma rays in sub-GeV dark matter detectors" @default.
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- W4286560972 doi "https://doi.org/10.1103/physrevd.106.023026" @default.
- W4286560972 hasPublicationYear "2022" @default.
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