Crisosto N, Sikivie P, Sullivan N S, Tanner D B, Yang J, Rybka G
University of Florida, Gainesville, Florida 32611, USA.
University of Washington, Seattle, Washington 98195, USA.
Phys Rev Lett. 2020 Jun 19;124(24):241101. doi: 10.1103/PhysRevLett.124.241101.
Axions are a promising cold dark matter candidate. Haloscopes, which use the conversion of axions to photons in the presence of a magnetic field to detect axions, are the basis of microwave cavity searches such as the Axion Dark Matter eXperiment (ADMX). To search for lighter, low frequency axions in the sub- 2×10^{-7} eV (50 MHz) range, a tunable lumped-element LC circuit has been proposed. For the first time, through ADMX SLIC (Superconducting LC Circuit Investigating Cold Axions), a resonant LC circuit was used to probe this region of axion mass-coupling space. The detector used a superconducting LC circuit with piezoelectric driven capacitive tuning. The axion mass and corresponding frequency ranges 1.7498-1.7519×10^{-7} eV (42.31-42.36 MHz), 1.7734-1.7738×10^{-7} eV (42.88-42.89 MHz), and 1.8007-1.8015×10^{-7} eV (43.54-43.56 MHz) were covered at magnetic fields of 4.5 T, 5.0 T, and 7.0 T, respectively. Exclusion results from the search data, for coupling below 10^{-12} GeV^{-1}, are presented.
轴子是一种很有前景的冷暗物质候选者。在磁场存在的情况下，利用轴子向光子的转换来探测轴子的轴子探测器，是诸如轴子暗物质实验（ADMX）等微波腔搜索的基础。为了在低于2×10⁻⁷ eV（50兆赫）的范围内寻找更轻、低频的轴子，人们提出了一种可调谐集总元件LC电路。通过ADMX SLIC（超导LC电路研究冷轴子）首次使用了谐振LC电路来探测轴子质量 - 耦合空间的这一区域。该探测器使用了一个带有压电驱动电容调谐的超导LC电路。在4.5特斯拉、5.0特斯拉和7.0特斯拉的磁场下，分别覆盖了轴子质量和相应频率范围为1.7498 - 1.7519×10⁻⁷ eV（42.31 - 42.36兆赫）、1.7734 - 1.7738×10⁻⁷ eV（42.88 - 42.89兆赫）以及1.8007 - 1.8015×10⁻⁷ eV（43.54 - 43.56兆赫）。给出了搜索数据中耦合低于10⁻¹² GeV⁻¹时的排除结果。
