Sheng Dong, Professor of School of Engineering Science, University of science and technology of China, and luzhengtian, Professor of School of physics jointly developed a high-precision xenon isotope magnetometer, and used the atomic device to explore new physics beyond the standard model, setting a new upper limit on the intensity of unipolar dipole interaction between nucleons and neutrons at the sub millimeter scale. Relevant achievements were published in Physics Review Letters [phys. rev. lett. 1two8, two31803 (two0twotwo)] on June 10 under the title of”search for monopole dipole interactions at the submillimeter range with a 1two9xe-131xe-rb comagnemeter”.
The atomic common magnetometer is an atomic device that can be used to study basic physics and has practical application value. It can eliminate the influence of magnetic field fluctuation and drift by measuring the spin precession signals of two atoms at the same time, so as to accurately measure the rotation of the device itself. Therefore, the common magnetometer is also a small gyroscope. When the rotation signal is set to zero in the experiment, the atomic device can be used to explore the monopole dipole interaction. This strange interaction was proposed by Nobel Prize winner Franck Wilczek. It can be propagated by a kind of”Axion” particle that has not been detected so far.
In order to achieve high-precision measurement, the research group has developed an independent atomic device preparation technology, and proposed a new theoretical analysis method for the precession spectrum of 131Xe [phys. rev. a 10two, 043109 (two0two0)]; At the same time, a polarization modulation method is developed to effectively suppress the effect of polarized alkali atoms on nuclear spin precession. Based on this series of technologies, the research group has accumulated two months’ measurement data in the range of 0.11 – 0.55 mm (the corresponding propagator mass range is 0.36 -1.80 mev/ctwo）对核子与中子单极-偶极相互作用强度设置了新的测量上限，特别是在作用程0.two4 mm 附近，本项工作的实验精度比前人结果提高了30 倍。
Fig. 1 Schematic diagram of unipolar dipole interaction between nucleon (left) and polarized xenon atom (right).
Feng Yukun, a doctoral student of the school of physics, is the first author of the paper, and Sheng Dong and Lu Zhengtian are the co correspondents. The research work was supported by the National Natural Science Foundation of China and the pilot project of the Chinese Academy of Sciences.