In-beam measurement of the hydrogen hyperfine splitting - towards antihydrogen spectroscopy

Abstract

Antihydrogen, the lightest atom consisting purely of antimatter, is an ideal laboratory to study the CPT symmetry by comparison to 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 ${\nu }_{\mathrm{HF}}$=$1420405748.4(3.4)(1.6)\text{Hz}$ with a relative precision of $\Delta$${\nu }_{\mathrm{HF}}$/${\nu }_{\mathrm{HF}}$=$2.7\times 10^{-9}$ constitutes the most precise determination of this quantity in a beam and verifies the developed spectroscopy methods for the antihydrogen HFS experiment to the ppb level. Together with the recently presented observation of antihydrogen atoms $2.7\text{m}$ downstream of the production region, the prerequisites for a measurement with antihydrogen are now available within the ASACUSA collaboration.

References in corpus (5)

• CODATA Recommended Values of the Fundamental Physical Constants: 2014
• Lorentz and CPT tests with hydrogen, antihydrogen, and related systems
• Physics at CERN's Antiproton Decelerator
• Measurement of the hyperfine structure of antihydrogen in a beam
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Cited by in corpus (16)

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• The ASACUSA antihydrogen and hydrogen program : results and prospects
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• A hydrogen beam to characterize the ASACUSA antihydrogen hyperfine spectrometer
• GRASIAN: Towards the first demonstration of gravitational quantum states of atoms with a cryogenic hydrogen beam
• CPT and Lorentz symmetry tests with hydrogen using a novel in-beam hyperfine spectroscopy method applicable to antihydrogen experiments
• Monte-Carlo based performance assessment of ASACUSA's antihydrogen detector
• Antiproton beams with low energy spread for antihydrogen production
• Thermal radiative corrections to hyperfine structure of light hydrogen-like systems
• Hyperfine spectroscopy of antihydrogen, hydrogen, and deuterium
• Synthetic half-integer magnetic monopole and single-vortex dynamics in spherical Bose-Einstein condensates
• Precision Spectroscopy of 2S-nS Transitions in Atomic Hydrogen: A Determination of the Proton Charge Radius
• Demonstration of deuterium's enhanced sensitivity to symmetry violations governed by the Standard-Model Extension
• Estimation of antihydrogen properties in experiments with small signal deficit
• Evaluation of the beam-induced depolarization of the HJET target at the EIC