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Proposal for a Cosmic Axion Spin Precession Experiment (CASPEr)

机译:宇宙轴自旋进动实验(CASPEr)的提案

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We propose an experiment to search for QCD axion and axionlike-particle dark matter. Nuclei that are interacting with the background axion dark matter acquire time-varying CP-odd nuclear moments such as an electric dipole moment. In analogy with nuclear magnetic resonance, these moments cause precession of nuclear spins in a material sample in the presence of an electric field. Precision magnetometry can be used to search for such precession. An initial phase of this experiment could cover many orders of magnitude in axionlike-particle parameter space beyond the current astrophysical and laboratory limits. And with established techniques, the proposed experimental scheme has sensitivity to QCD axion masses ma?10?9 eV, corresponding to theoretically well-motivated axion decay constants fa?1016 GeV. With further improvements, this experiment could ultimately cover the entire range of masses ma?μ eV, complementary to cavity searches.
机译:我们提出了一个实验来寻找QCD轴突和轴突状颗粒暗物质。与本底轴暗物质相互作用的核获得了时变的CP奇数核矩,例如电偶极矩。与核磁共振类似,这些瞬间会导致存在电场的情况下材料样品中的核自旋进动。精密磁力计可用于搜索此类进动。该实验的初始阶段可能会超出当前的天体物理学和实验室极限,覆盖轴突颗粒参数空间中的多个数量级。并借助已建立的技术,提出的实验方案对QCD轴质量为ma?10?9 eV敏感,对应于理论上有良好动机的轴衰变常数fa?1016 GeV。随着进一步的改进,该实验最终可以覆盖整个质量范围,与腔体搜索相辅相成。

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