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Creators/Authors contains: "Othman, G."

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  1. ; ; ; ; ; ; ; ; ; ; et al (, Physical Review Letters)
    With excellent energy resolution and ultralow-level radiogenic backgrounds, the high-purity germanium detectors in the Majorana Demonstrator enable searches for several classes of exotic dark matter (DM) models. In this work, we report new experimental limits on keV-scale sterile neutrino DM via the transition magnetic moment from conversion to active neutrinos πœˆπ‘ β†’πœˆπ‘Ž. We report new limits on fermionic dark matter absorption (πœ’+π΄β†’πœˆ+𝐴) and sub-GeV DM-nucleus 3β†’2 scattering (πœ’+πœ’+π΄β†’πœ™+𝐴), and new exclusion limits for bosonic dark matter (axionlike particles and dark photons). These searches utilize the (1–100)-keV low-energy region of a 37.5-kg y exposure collected by the Demonstrator between May 2016 and November 2019 using a set of 76Ge-enriched detectors whose surface exposure time was carefully controlled, resulting in extremely low levels of cosmogenic activation. 
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  2. ; ; ; ; ; ; ; ; ; ; et al (, Journal of Instrumentation)
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  3. ; ; ; ; ; ; ; ; ; ; et al (, Physical Review C)
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  4. ; ; ; ; ; ; ; ; ; ; et al (, Physical Review C)
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  5. ; ; ; ; ; ; ; ; ; ; et al (, Physical Review Letters)
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  6. ; ; ; ; ; ; ; ; ; ; et al (, Physical Review Letters)
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  7. ; ; ; ; ; ; ; ; ; ; et al (, Physical Review Letters)
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  8. ; ; ; ; ; ; ; ; ; ; et al (, Physical Review C)
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  9. ; ; ; ; ; ; ; ; ; ; et al (, Journal of Instrumentation)
    Abstract The Majorana Demonstrator comprises two arrays of high-purity germanium detectors constructed to search for neutrinoless double-beta decay in 76 Ge and other physics beyond the Standard Model. Its readout electronics were designed to have low electronic noise, and radioactive backgrounds were minimized by using low-mass components and low-radioactivity materials near the detectors. This paper provides a description of all components of the Majorana Demonstrator readout electronics, spanning the front-end electronics and internal cabling, back-end electronics, digitizer, and power supplies, along with the grounding scheme. The spectroscopic performance achieved with these readout electronics is also demonstrated. 
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  10. ; ; ; ; ; ; ; ; ; ; et al (, Physical Review C)
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