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Observation of the effect of gravity on the motion of antimatter

Magnetically confined neutral antihydrogen atoms released in a gravity field were found to fall towards Earth like ordinary matter, in accordance with Einstein’s general theory of relativity.

E. K. Anderson
C. J. Baker
J. S. Wurtele
ResearchOpen Access27 Sept 2023
Nature

Volume: 621, P: 716-722
Precision spectroscopy of the hyperfine components of the 1S–2S transition in antihydrogen

The ALPHA Collaboration reports measurements of the hyperfine components of the 1S–2S transition in trapped antihydrogen. They interpret the results as a test of the invariance of charge–parity–time-reversal symmetry.

C. J. Baker
W. Bertsche
G. M. Shore
ResearchOpen Access17 Jan 2025
Nature Physics

Volume: 21, P: 201-207
Sympathetic cooling of positrons to cryogenic temperatures for antihydrogen production

Positrons are key to the production of cold antihydrogen. Here the authors report the sympathetic cooling of positrons by interacting them with laser-cooled Be⁺ ions resulting in a three-fold reduction of the temperature of positrons for antihydrogen synthesis.

C. J. Baker
W. Bertsche
J. S. Wurtele
ResearchOpen Access22 Oct 2021
Nature Communications

Volume: 12, P: 1-8
Laser cooling of antihydrogen atoms

The successful laser cooling of trapped antihydrogen, the antimatter atom formed by an antiproton and a positron (anti-electron), is reported.

C. J. Baker
W. Bertsche
J. S. Wurtele
ResearchOpen Access31 Mar 2021
Nature

Volume: 592, P: 35-42