Hyperfine structure: from hydrogen to antihydrogen

CERN; Malbrunot, Chloe

Published 2017 | Version v1

Periodical article Open

Hyperfine structure: from hydrogen to antihydrogen

1. European Organization for Nuclear Research

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Earlier this year, the ASACUSA experiment at CERN's Antiproton Decelerator published the most precise in-beam measurement of the hydrogen ground-state hyperfine splitting, and is now preparing for new measurements.

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vol57-issue10-p023-e.pdf

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vol57-issue10-p023-e.pdf md5:2de30fd4f897aca20bd3f2911d8b13b0	617.1 kB	Preview Download
The ASACUSA experimental set-up, with the source of hydrogen visible by its characteristic pink glow. md5:bcba2b5c27a9e85032ab22254aff1d29	309.4 kB	Preview Download
Fig. 1. The Breit-Rabi diagram shows the energy levels in ground-state hydrogen as a function of the strength of an external magnetic field. The states with a positive or negative slope are named low- and high-field seekers (Ifs or hfs), respectively, and three possible hyperfine transitions between Ifs and hfs are denoted by arrows. md5:5543d977325ccc37c006665b471fa0d2	56.1 kB	Preview Download
Fig. 2. Schematic of the experimental set-up for ASACUSA's hydrogen hyperfine splitting measurement. The cavity and sextupole are identical to those that will be used in the planned antihydrogen experiment. md5:84731a1a0bedd755541d0d59190f30b8	82.2 kB	Preview Download
Fig. 3. Example of a hyperfine resonance spectrum in an external static magnetic field of around 80 ßT. The "double-dip" structure is due to the particular shape of the RFfield in the cavity leading to afield changing sign at the centre. The line at 0 represents the known zero-field value from established maser measurements. More than 500 such spectra have been recorded under changing experimental conditions to extrapolate to the zero-field hyper-fine splitting value, with ASACUSÄ's final result shown in the inset (note the different scales). md5:c0e9e867b4e1406d3c029a859281dc6b	50.4 kB	Preview Download

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Issued: 2017-12

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Others:

Earlier this year, the ASACUSA experiment at CERN's Antiproton Decelerator published the most precise in-beam measurement of the hydrogen ground-state hyperfine splitting, and is now preparing for new measurements.

vol57-issue10-p023-e.pdf

Files (1.1 MB)

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CERN

Hyperfine structure: from hydrogen to antihydrogen

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Earlier this year, the ASACUSA experiment at CERN's Antiproton Decelerator published the most precise in-beam measurement of the hydrogen ground-state hyperfine splitting, and is now preparing for new measurements.

Files

vol57-issue10-p023-e.pdf

Files (1.1 MB)

Additional details

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Dates

CERN

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