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Creators/Authors contains: "Kim, Younggeun"

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  1. ; ; ; ; ; ; ; ; ; ; et al (, Physical Review D)
    We search for dark matter in the form of axionlike particles (ALPs) in the mass range 5.576741     neV / c 2 − 5.577733     neV / c 2 by probing their possible coupling to fermion spins through the ALP field gradient. This is achieved by performing proton nuclear magnetic resonance spectroscopy on a sample of methanol as a technical demonstration of the Cosmic Axion Spin Precession Experiment Gradient (CASPEr-Gradient) Low-Field apparatus. Searching for spin-coupled ALP dark matter in this mass range with associated Compton frequencies in a 240 Hz window centered at 1.348570 MHZ resulted in a sensitivity to the ALP-proton coupling constant of g ap ≈ 3 × 10 − 2     GeV − 1 . This narrow-bandwidth search serves as a proof-of-principle and a commissioning measurement, validating our methodology and demonstrating the experiment’s capabilities. CASPEr-Gradient Low-Field will probe the mass range from 4.1     peV / c 2 to 17    neV / c 2 with hyperpolarized samples to boost the sensitivity beyond the astronomical limits. 
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    Free, publicly-accessible full text available September 1, 2026
  2. ; ; ; ; ; ; ; ; (, Journal of Low Temperature Physics)
    ARIADNE (Axion Resonant InterAction Detection Experiment) is a table-top experiment that intends to search for QCD axions from exotic spin-dependent interactions mediated by axion between nuclei at sub-mm range. This experiment includes a non-magnetic mass to source the axion field, and a dense ensemble of hyper-polarized 3He nuclei to detect the axion field with nuclear-magnetic-resonance (NMR)-based method. The expected NMR signal from the interaction could be easily buried in the noise spectrum of the magnetometer, especially in a frequency range (~ 100 Hz) where the interaction signal is supposed to exist. In this work, we report optimization of SQUID gradiometer for ARIADNE including noise spectrum measurement. 
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  3. ; ; ; ; ; ; ; ; (, Physics of the Dark Universe)
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