Detection of solar dark massive particles with micro-mechanical sensor.

We report the direct detection of solar dark massive particles in an Earth-based laboratory with the help of a micro-mechanical detector, which does not require electrical or chemical interactions. When an external massive particle propagates inside such a sensor it may influence the original dynamics of sensor atoms, and in this way can be noticed. Detected particles are electrically neutral with a non-zero rest mass of (5.6 ± 1.7) ×10^-21 kg. The detections of solar dark particles during different dates and times are discussed. The sensors are micro-weight crystals suspended as a bob of the pendulum, which oscillates when solar dark particles hit it. The oscillations may be optically registered with a laser Doppler vibrometer (2023 April APS meeting). Another independent registration is detecting changes in high-frequency electrical current through the crystal-sensor. The detection data from both channels of registration are discussed. The detection is sensitive to the space orientation of the crystallographic axes of the crystal-sensor. Dark particles are detected when the normal to-crystal surface crystallographic axis is oriented along the solar azimuth. Dark particles are detected only when the Sun is above the horizon. It means they all are absorbed by Earth. The theoretical calculations and experimental data from two registration channels return similar masses of discovered solar dark particles. These particles are undetectable and dark to existing astrophysical and high-energy physics instruments.