期刊
PHYSICAL REVIEW LETTERS
卷 111, 期 10, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.111.100801
关键词
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资金
- Deutsche Forschungsgemeinschaft (DFG) [BA 3605/1-1]
- research center Elementary Forces and Mathematical Foundations (EMG) of the University in Mainz
- PRISMA cluster of excellence at Mainz
We search for a spin-dependent P- and T-violating nucleon-nucleon interaction mediated by light pseudoscalar bosons such as axions or axionlike particles. We employ an ultrasensitive low-field magnetometer based on the detection of free precession of colocated He-3 and Xe-129 nuclear spins using SQUIDs as low-noise magnetic flux detectors. The precession frequency shift in the presence of an unpolarized mass was measured to determine the coupling of pseudoscalar particles to the spin of the bound neutron. For boson masses between 2 and 500 mu eV (force ranges between 3 x 10(-4) m and 10(-1) m) we improved the laboratory upper bounds by up to 4 orders of magnitude.
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