Retraction: Measuring the enhancement factor of the hyperpolarized Xe in nuclear magnetic resonance gyroscopes (Physical Review A (2021) 103 (023114) DOI: 10.1103/PhysRevA.103.023114)

In atomic gyroscopes, measuring the effective noble-gas magnetic field enables the determination of the noble-gas polarization. The enhancement factor is introduced to relate the effective magnetic field and the polarization in a certain magnetic-field environment. Earlier experiments concentrate on the strong magnetic-field environment for measuring the spin-exchange cross section precisely, so the results on the enhancement factor in the weak magnetic field are still insufficient. In our nuclear magnetic resonance gyroscope based on Cs-129 Xe and - 131Xe, the magnetic field is usually set to 1–10 μ T. In this paper, we measure the effective magnetic field and the polarization of Xe atoms to estimate the Cs-Xe enhancement factor in the weak magnetic field of 2.5 μT and give the estimation of the Cs-129Xe enhancement factor of (1.60±0.06)x104.