The cosmic axion spin precession experiment (CASPEr): a dark-matter search with nuclear magnetic resonance
The cosmic axion spin precession experiment (CASPEr): a dark-matter search with nuclear magnetic resonance
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DOI：
10.1088/2058-9565/aa9861
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发表时间：
2018-01-01
影响因子：
6.7
通讯作者：
Budker, Dmitry
中科院分区：
文献类型：
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作者：
Garcon, Antoine;Aybas, Deniz;Budker, Dmitry
宇宙轴子自旋进动实验(Casper)是一项核磁共振实验，旨在探测轴子和类似轴子的粒子，它们可能构成宇宙中存在的暗物质。我们回顾了轴子和轴子类粒子与重子物质的耦合预测，使它们能够通过核磁共振进行检测。然后，我们描述了在Casper中实施的两个测量方案。第一种方法，在最初的Casper提案中提出，包括通过连续波核磁共振波谱进行共振搜索。这种方法在几赫兹到数百兆赫的频率范围内提供了最高的灵敏度，对应于质量为10(-14)-10(-6)eV的质量m(A)。亚赫兹频率通常很难用核磁共振探测，因为磁力计在这一地区的灵敏度越来越低。为了绕过这一限制，我们建议采用新的检测和数据处理模式。我们描述了一种非共振调频检测方案，能够搜索从MHz到HZ的频率(m(A)类似于10(-17)-10(-14)eV)，将检测带宽延长了30年。
The cosmic axion spin precession experiment (CASPEr) is a nuclear magnetic resonance experiment (NMR) seeking to detect axion and axion-like particles which could make up the dark matter present in the Universe. We review the predicted couplings of axions and axion-like particles with baryonic matter that enable their detection via NMR. We then describe two measurement schemes being implemented in CASPEr. The first method, presented in the original CASPEr proposal, consists of a resonant search via continuous-wave NMR spectroscopy. This method offers the highest sensitivity for frequencies ranging from a few Hz to hundreds of MHz, corresponding to masses m(a) similar to 10(-14)-10(-6) eV. Sub-Hz frequencies are typically difficult to probe with NMR due to the diminishing sensitivity of magnetometers in this region. To circumvent this limitation, we suggest new detection and data processing modalities. We describe a non-resonant frequency-modulation detection scheme, enabling searches from mHz to Hz frequencies (m(a) similar to 10(-17)-10(-14) eV), extending the detection bandwidth by three decades.