Lee Youngjae, Yang Byeongsu, Yoon Hojin, Ahn Moohyun, Park Heejun, Min Byeonghun, Kim DongLak, Yoo Jonghee
Department of Physics, Korea Advanced Institute of Science and Technology, Daejeon 34141, Korea.
Center for Axion and Precision Physics Research, Institute for Basic Science, Daejeon 34051, Korea.
Phys Rev Lett. 2022 Jun 17;128(24):241805. doi: 10.1103/PhysRevLett.128.241805.
We report the first search results for axion dark matter using an 18 T high-temperature superconducting magnet haloscope. The scan frequency ranges from 4.7789 to 4.8094 GHz. No significant signal consistent with the Galactic halo dark matter axion is observed. The results set the best upper bound of axion-photon-photon coupling (g_{aγγ}) in the mass ranges of 19.764 to 19.771 μeV (19.863 to 19.890 μeV) at 1.5×|g_{aγγ}^{KSVZ}| (1.7×|g_{aγγ}^{KSVZ}|), and 19.772 to 19.863 μeV at 2.7×|g_{aγγ}^{KSVZ}| with 90% confidence level, respectively. This remarkable sensitivity in the high mass region of dark matter axion is achieved by using the strongest magnetic field among the existing haloscope experiments and realizing a low-noise amplification of microwave signals using a Josephson parametric converter.
我们报告了使用一个18T高温超导磁体式轴子暗物质探测器的首批搜索结果。扫描频率范围为4.7789至4.8094GHz。未观测到与银河系晕暗物质轴子一致的显著信号。结果在19.764至19.771μeV（19.863至19.890μeV）的质量范围内，以1.5×|g_{aγγ}^{KSVZ}|（1.7×|g_{aγγ}^{KSVZ}|），以及在19.772至19.863μeV的质量范围内，以2.7×|g_{aγγ}^{KSVZ}|分别设定了轴子 - 光子 - 光子耦合（g_{aγγ}）的最佳上限，置信水平为90%。在暗物质轴子的高质量区域的这种显著灵敏度是通过在现有的磁体式探测器实验中使用最强磁场，并利用约瑟夫森参量转换器实现微波信号的低噪声放大来实现的。
