Abstract
An axion dark matter search with the CAPP-8TB haloscope is reported. Our results are sensitive to axion-photon coupling g_{aγγ} down to the QCD axion band over the axion mass range between 6.62 and 6.82 μeV at a 90%confidence level, which is the most sensitive result in the mass range to date.
Highlights
Precision cosmological measurements strongly favor the standard model of big bang cosmology where about 85% of the matter in the Universe is cold dark matter (CDM) [1]
CDM itself is beyond the standard model of particle physics (SM), and, the nature of about 85% of the matter in the Universe is still unknown to date
The axion haloscope search proposed by Sikivie [11] involves the resonant conversion of axions to photons in a microwave cavity permeated by a static magnetic field
Summary
270 km=s and the Earth rms velocity of 230 km=s with respect to the galaxy frame [15], respectively, which is the model adopted in this Letter. We report an axion dark matter search with the CAPP-8TB haloscope at the Institute for Basic Science (IBS) Center for Axion and Precision Physics Research (CAPP) [16]. The CAPP-8TB haloscope has a tunable copper cylindrical cavity as a resonator, a cryogen-free NbTi superconductor solenoid [17], and a typical heterodyne receiver chain equipped with a state-of-the-art high-electron-mobility transistor (HEMT) LNF-LNC0.6_2A [18] as the first amplifier. The experiment maintains the physical temperature of the cavity at about 47 mK using a cryogen-free dilution refrigerator BF-LD400 [19]. The frequency tuning mechanism is comprised of a fully alumina based tuning rod system, a locomotive shaft to link the tuning rod axle, and a rotational stepper motor.
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