Institut für Physik, Johannes Gutenberg-Universität, 55099 Mainz, Germany.
Physikalisches Institut, Universität Heidelberg, 69120 Heidelberg, Germany.
Phys Rev Lett. 2013 Sep 6;111(10):100801. doi: 10.1103/PhysRevLett.111.100801. Epub 2013 Sep 3.
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 3He and 129Xe 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 μeV (force ranges between 3×1(-4) m and 10(-1) m) we improved the laboratory upper bounds by up to 4 orders of magnitude.
我们寻找由光赝标玻色子（如轴子或轴子样粒子）介导的自旋相关的 P 和 T 破坏的核子-核子相互作用。我们采用了一种基于超导量子干涉仪（SQUID）作为低噪声磁通探测器的同位 3He 和 129Xe 核自旋自由进动检测的超灵敏低场磁强计。在无极化质量的情况下测量进动频率的移动，以确定赝标粒子与束缚中子自旋的耦合。对于质量在 2 到 500 μeV 之间的玻色子（力的范围在 3×1(-4) m 到 10(-1) m 之间），我们将实验室上限提高了 4 个数量级。
