Road transport of trapped antiprotons
Abstract Low-energy antiprotons confined in ultrahigh-vacuum Penning traps 1 enable precision investigations of charge, parity and time-reversal (CPT) invariance 2 to test the fundamental symmetry between matter and antimatter. These studies are driven by the search for physics beyond the standard model of particle physics, including efforts to explain the observed cosmological matter–antimatter asymmetry. Until now, such experiments have only been possible at CERN’s Antimatter Factory 3,4 . At present, magnetic-field fluctuations caused by the facility operation limit the sensitivity of trapped-antiproton precision measurements 5 , which provide the most stringent matter–antimatter symmetry tests in the baryon sector 6–9 . This has inspired us to develop the cryogenic, open and transportable Penning-trap system BASE-STEP 5,10 , designed to relocate antiprotons into low-noise offline laboratories, a strategy expected to enable at least 100-fold improved CPT tests 9,11 . Here we demonstrate the road transport of antiprotons trapped in BASE-STEP. Ninety-two trapped antiprotons have been transported outside the Antimatter Factory along a 7.5-km route without particle loss or measurable degradation of the trap vacuum. This achievement marks the starting point for a new era of antiproton precision measurements 8,12 in dedicated low-noise offline laboratory environments.
Authors
- J. I. Jäger (ORCID: https://orcid.org/0009-0006-6117-2975)
- H. Yildiz (ORCID: https://orcid.org/0009-0009-8661-8816)
- Kamran Anjum (ORCID: https://orcid.org/0009-0001-8173-8773)
- B. M. Latacz (ORCID: https://orcid.org/0000-0003-2320-1713)
- S. Ulmer (ORCID: https://orcid.org/0000-0002-4185-4147)
- Marc Leonhardt (ORCID: https://orcid.org/0009-0003-9531-5290)
- B. P. Arndt (ORCID: https://orcid.org/0009-0002-1061-5917)
- C. Ospelkaus (ORCID: https://orcid.org/0000-0002-4170-2936)
- W. Quint (ORCID: https://orcid.org/0000-0003-0682-7247)
- P. Micke (ORCID: https://orcid.org/0000-0001-7430-8751)
- K. Blaum (ORCID: https://orcid.org/0000-0003-4468-9316)
- Y. Yamazaki
- C. Smorra (ORCID: https://orcid.org/0000-0001-5584-7960)
- A. Sótér (ORCID: https://orcid.org/0000-0002-3751-9944)
- Tomoka Imamura (ORCID: https://orcid.org/0000-0002-9232-455X)
- J. Walz
- R. Rahner
- Raphael Czampiel (ORCID: https://orcid.org/0009-0006-3659-4156)
- D. Schweitzer
- S. Endoh
- L. Kürschner
- Y. Matsuda
- D. Natakala
- F. Völksen
- J. Morgner
- F. Abbass
- J. A. Devlin
- S. Stahl
- N. Daehnhardt
Institutions
- Leibniz University Hannover (DE)
- Physikalisch-Technische Bundesanstalt (DE)
- GSI Helmholtz Centre for Heavy Ion Research (DE)
- Johannes Gutenberg University Mainz (DE)
- Board of the Swiss Federal Institutes of Technology (CH)
- ETH Zurich (CH)
- Helmholtz Institute Mainz (DE)
- Max Planck Institute for Nuclear Physics (DE)
- Heinrich Heine University Düsseldorf (DE)
- Imperial College London (GB)
- European Organization for Nuclear Research (CH)
Publication Details
- Journal
- Nature
- Published
- 2026-09-16
- DOI
- https://doi.org/10.1038/s41586-026-11019-z
- Citations
- 1
- Primary Topic
- Dark Matter and Cosmic Phenomena
- Type
- article
- Field-Weighted Citation Impact
- 4.21