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- W3100448305 abstract "Light, MeV-scale dark matter (DM) is an exciting DM candidate that is undetectable by current experiments. A germanium (Ge) detector utilizing internal charge amplification for the charge carriers created by the ionization of impurities is a promising new technology with experimental sensitivity for detecting MeV-scale DM. We analyze the physics mechanisms of the signal formation, charge creation, charge internal amplification, and the projected sensitivity for directly detecting MeV-scale DM particles. We present a design for a novel Ge detector at helium temperature ($sim$4 K) enabling ionization of impurities from DM impacts. With large localized E-fields, the ionized excitations can be accelerated to kinetic energies larger than the Ge bandgap at which point they can create additional electron-hole pairs, producing intrinsic amplification to achieve an ultra-low energy threshold of $sim$0.1 eV for detecting low-mass DM particles in the MeV scale. Correspondingly, such a Ge detector with 1 kg-year exposure will have high sensitivity to a DM-nucleon cross section of $sim$5$times$10$^{-45}$ cm$^{2}$ at a DM mass of $sim$10 MeV/c$^{2}$ and a DM-electron cross section of $sim$5$times$10$^{-46}$cm$^{2}$ at a DM mass of $sim$1 MeV/c$^2$." @default.
- W3100448305 created "2020-11-23" @default.
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- W3100448305 date "2018-03-01" @default.
- W3100448305 modified "2023-09-24" @default.
- W3100448305 title "Direct detection of MeV-scale dark matter utilizing germanium internal amplification for the charge created by the ionization of impurities" @default.
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- W3100448305 doi "https://doi.org/10.1140/epjc/s10052-018-5653-z" @default.
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