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束流内测量氢的精细结构分裂及反氢光谱学的前景。

In-beam measurement of the hydrogen hyperfine splitting and prospects for antihydrogen spectroscopy.

机构信息

Stefan-Meyer-Institut für Subatomare Physik, Österreichische Akademie der Wissenschaften, Boltzmanngasse 3, Wien 1090, Austria.

Experimental Physics Department, CERN, Genève 23, CH-1211, Switzerland.

出版信息

Nat Commun. 2017 Jun 12;8:15749. doi: 10.1038/ncomms15749.

DOI:10.1038/ncomms15749
PMID:28604657
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5472788/
Abstract

Antihydrogen, the lightest atom consisting purely of antimatter, is an ideal laboratory to study the CPT symmetry by comparison with hydrogen. With respect to absolute precision, transitions within the ground-state hyperfine structure (GS-HFS) are most appealing by virtue of their small energy separation. ASACUSA proposed employing a beam of cold antihydrogen atoms in a Rabi-type experiment, to determine the GS-HFS in a field-free region. Here we present a measurement of the zero-field hydrogen GS-HFS using the spectroscopy apparatus of ASACUSA's antihydrogen experiment. The measured value of ν=1,420,405,748.4(3.4) (1.6) Hz with a relative precision of 2.7 × 10 constitutes the most precise determination of this quantity in a beam and verifies the developed spectroscopy methods for the antihydrogen HFS experiment to the p.p.b. level. Together with the recently presented observation of antihydrogen atoms 2.7 m downstream of the production region, the prerequisites for a measurement with antihydrogen are now available within the ASACUSA collaboration.

摘要

反氢，由纯反物质组成的最轻原子，是通过与氢进行比较来研究 CPT 对称性的理想实验室。就绝对精度而言，由于其能量分离较小，基态超精细结构（GS-HFS）内的跃迁是最吸引人的。ASACUSA 提议在 Rabi 型实验中使用一束冷反氢原子，以在无场区域确定 GS-HFS。在这里，我们使用 ASACUSA 反氢实验的光谱仪，对无场氢 GS-HFS 进行了测量。测量值 ν=1,420,405,748.4(3.4) (1.6) Hz，相对精度为 2.7×10，这是在束中对该量的最精确测定，并验证了反氢 HFS 实验的光谱方法达到了 p.p.b. 级别的精度。与最近报道的在生产区域下游 2.7 m 处观察到的反氢原子一起，ASACUSA 合作现在已经具备了进行测量的前提条件。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/075e/5472788/b9cdbbd77303/ncomms15749-f7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/075e/5472788/0d313cc1d3c6/ncomms15749-f1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/075e/5472788/49c781dcb4ee/ncomms15749-f2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/075e/5472788/9e6eeefaa010/ncomms15749-f3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/075e/5472788/4aa34dffff82/ncomms15749-f4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/075e/5472788/7de4502586f3/ncomms15749-f5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/075e/5472788/98fd7fb3522a/ncomms15749-f6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/075e/5472788/b9cdbbd77303/ncomms15749-f7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/075e/5472788/0d313cc1d3c6/ncomms15749-f1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/075e/5472788/49c781dcb4ee/ncomms15749-f2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/075e/5472788/9e6eeefaa010/ncomms15749-f3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/075e/5472788/4aa34dffff82/ncomms15749-f4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/075e/5472788/7de4502586f3/ncomms15749-f5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/075e/5472788/98fd7fb3522a/ncomms15749-f6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/075e/5472788/b9cdbbd77303/ncomms15749-f7.jpg

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