2009/04/01 by M. Diermaier, Christian Baadsgaard Jepsen, C. B. Jepsen +11 · 1 citation
Biochemistry, Genetics and Molecular Biology · Medicine · Physics and Astronomy · Psychology · #Advanced Frequency and Time Standards #Antihydrogen #Antimatter #Atomic and Molecular Physics #Atomic physics #Beam (structure) #CPT symmetry #Childhood Cancer Survivors' Quality of Life #Cognitive Abilities and Testing #Cold Atom Physics and Bose-Einstein Condensates #Developmental psychology #Genetics and Neurodevelopmental Disorders #Hydrogen #Hydrogen atom #Hyperfine structure #Interim #Internal medicine #Lepton #Medicine #Nuclear physics #Optics #Pediatrics #Physics #Political science #Psychiatry #Psychology #Quantum mechanics #Spectroscopy #Thyroid #Thyroid function #physics.atom-ph
paper · pdf · doi:10.1038/ncomms15749
published in 11th European Congress of Endocrinology 20(1), 15749 (Nature Portfolio)
openalex publication_date 2009/04/01 · openalex created_date 2016/06/24 · arxiv created 2016/10/20 · arxiv updated 2017/08/02 · openalex updated_date 2026/06/17
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<sub>HF</sub>=1,420,405,748.4(3.4) (1.6) Hz with a relative precision of 2.7 × 10<sup>-9</sup> 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.