Measurement of the hyperfine structure of antihydrogen in a beam

Widmann, E.; Diermaier, M.; Juhász, B.; Malbrunot, C.; Massiczek, O.; Sauerzopf, C.; Suzuki, K.; Wünschek, B.; Zmeskal, J.; Federmann, S.; Kuroda, N.; Ulmer, S.; Yamazaki, Y.

doi:10.1007/s10751-013-0809-6

Cited by 33 publications

(26 citation statements)

References 13 publications

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“…6 The approach followed by ASACUSA requires the formation of a beam of H and offers the advantage that the actual measurement, i.e., the interaction with microwaves, takes place in a well-controlled environment far away from the strong fields and field gradients of the trap for H formation. 7,8 The observation of extracted antiatoms had been reported in Ref. 9, and later this beam had its quantum-state distribution characterized in Ref.…”

Section: Status Of Asacusa's Antihydrogen Programmentioning

confidence: 88%

Rabi Experiments on the σ and π Hyperfine Transitions in Hydrogen and Status of ASACUSA’s Antihydrogen Program

Simón

2020

CPT and Lorentz Symmetry

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On behalf of the ASACUSA Collaboration *We report on the status of the in-beam hyperfine-structure measurements on ground-state antihydrogen by ASACUSA and on recent results obtained in supporting measurements from hydrogen. The σ 1 and π 1 transitions can now be investigated, which is beneficial from both theoretical and experimental perspectives. We discuss systematic effects from resonance interference originating from the chosen field geometries in the interaction region, and how their impact can be managed by appropriate data-taking or design concepts. *

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Section: Status Of Asacusa's Antihydrogen Programmentioning

confidence: 88%

Rabi Experiments on the σ and π Hyperfine Transitions in Hydrogen and Status of ASACUSA’s Antihydrogen Program

Simón

2020

CPT and Lorentz Symmetry

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“…A solid Ne moderator is used to moderate e + s. By interaction with N 2 gas, the e + are accumulated in the second electromagnetic trap which is 1 …”

Section: Apparatusmentioning

confidence: 99%

“…In order to test CPT symmetry experimentally, the ASACUSA collaboration has developed a Rabi-like antiatomic beam technique to measure hyperfine splitting of the ground-state antihydrogen (H) atom [1,2]. The key of the antiatomic beam experiment is to synthesize a large number ofH atoms at several meV energy in a cusp magnetic field whose field gradient focusesH atoms [3].…”

Section: Introductionmentioning

confidence: 99%

Antihydrogen Synthesis in a Double-Cusp Trap

Kuroda

Tajima

Radics

et al. 2017

Proceedings of the 12th International Conference on Low Energy Antiproton Physics (LEAP2016)

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The ASACUSA CUSP experiment plans a high precision spectroscopy of the ground-state hyperfine splitting of antihydrogen to test CPT symmetry. To perform this, a Rabi-like antiatomic beam method has been developed with a novel double-cusp trap. Antihydrogen atoms were synthesized in the double-cusp trap by directly injecting antiprotons from an accumulation trap into a positron plasma. By adjusting the energy difference between the incoming antiproton beam and the positron plasma, a high-rate production of antihydrogen atoms was observed.

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“…The central part of the Rabi apparatus consists of a microwave cavity for flipping the antihydrogen spin and a superconducting sextupole magnet for spin analysis. 1 In order to verify the obtainable resolution of this setup, a source of cold and polarized hydrogen atoms was built at the Stefan Meyer Institute and combined with a Q-mass spectrometer to measure the GS-HFS of hydrogen. 4…”

Section: Introductionmentioning

confidence: 99%

Prospects of In-Flight Hyperfine Spectroscopy of (Anti)Hydrogen for Tests of CPT Symmetry

Widmann

2017

CPT and Lorentz Symmetry

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On behalf of the ASACUSA-CUSP CollaborationThe ground-state hyperfine splitting of antihydrogen promises one of the most sensitive tests of CPT symmetry. The ASACUSA collaboration is pursuing a measurement of this splitting in a Rabi-type experiment using a polarized beam from a CUSP magnet at the Antiproton Decelerator of CERN. With the initial intention of characterizing the Rabi apparatus, a polarized source of cold hydrogen was built and the σ 1 transition of hydrogen was measured to a few ppb precision. A measurement of the π 1 transition is being prepared. The availability of this beam opens the possibility to perform first measurements of some coefficients within the nonminimal Standard-Model Extension.

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Measurement of the hyperfine structure of antihydrogen in a beam

Abstract: A measurement of the hyperfine structure of antihydrogen promises one of the best tests of CPT symmetry. We describe an experiment planned at the Antiproton Decelerator of CERN to measure this quantity in a beam of slow antihydrogen atoms.

Cited by 33 publications

References 13 publications

Rabi Experiments on the σ and π Hyperfine Transitions in Hydrogen and Status of ASACUSA’s Antihydrogen Program

Rabi Experiments on the σ and π Hyperfine Transitions in Hydrogen and Status of ASACUSA’s Antihydrogen Program

Antihydrogen Synthesis in a Double-Cusp Trap

Prospects of In-Flight Hyperfine Spectroscopy of (Anti)Hydrogen for Tests of CPT Symmetry

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