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CERN’s BASE Team Transported 92 Antiprotons in a World First
In March 2026, CERN’s BASE collaboration transported 92 trapped antiprotons by truck across its Meyrin site and resumed operation afterward—the first such demonstration with free antimatter. BASE has already compared proton and antiproton charge to mass ratios to 16 parts per trillion; portable trapping could substa...
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Key takeaways
- In March 2026, CERN’s BASE collaboration transported 92 trapped antiprotons by truck across its Meyrin site and resumed operation afterward—the first such demonstration with free antimatter.
- BASE has already compared proton and antiproton charge to mass ratios to 16 parts per trillion; portable trapping could substantially improve complementary magnetic moment tests.
- The next target is an autonomous road journey of roughly 10 hours from CERN to a high precision laboratory being established at Heinrich Heine University Düsseldorf.
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openai.comCreate a landscape editorial hero image for this Studio Global article: What did the CERN BASE collaboration achieve in March 2026 by extracting 92 antiprotons from the Antimatter Factory, loading them into the n. Article summary: BASE achieved a world first: it transported a cloud of 92 trapped antiprotons by truck across CERN’s Meyrin site, then resumed operating the experiment after transport. This demonstrated that free antimatter can be prese. Topic tags: general, general web, academic. Style: premium digital editorial illustration, source-backed research mood, clean composition, high detail, modern web publication hero. Use reference image context only for broad subject, composition, and topical grounding; do not copy the exact image. Avoid: logos, brand marks, copyrighted characters, real person likenesses, fake screenshots, UI text, readable text, watermarks, charts with fake num
CERN’s Baryon Antibaryon Symmetry Experiment (BASE) has shown that trapped antiprotons can be moved out of their production environment and still be used afterward. In March 2026, the collaboration loaded a cloud of 92 antiprotons into its portable BASE-STEP cryogenic Penning trap, transported the apparatus by truck across CERN’s Meyrin site, and continued experiment operation after the trip. CERN described the result as a world first. 7
What BASE achieved
The experiment was more than a vehicle test. BASE disconnected a trap containing free, unbound antiprotons from the Antimatter Factory, moved the nearly one-tonne apparatus for about 30 minutes over roughly eight kilometres, and then retained the ability to operate on the particles after arrival. The antiprotons were subsequently stored and manipulated for more than a month, demonstrating that the system can serve as a portable reservoir rather than simply a brief transport container. 7
That distinction matters because antiprotons vanish when they contact ordinary matter. Their transport therefore requires a highly controlled cryogenic Penning trap, which confines charged particles with electromagnetic fields while maintaining the conditions needed for precision experiments. 1
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Why moving antimatter matters for CPT symmetry
CPT symmetry is a foundational principle of modern particle physics. It implies tightly matched properties for matter particles and their antimatter counterparts, including equal masses and magnetic moments of equal magnitude with opposite sign. A confirmed mismatch between a proton and an antiproton would be evidence of CPT violation and would point beyond the Standard Model. 5
BASE tests this symmetry by comparing fundamental proton and antiproton properties. Its proton–antiproton charge-to-mass-ratio comparison has reached a fractional precision of 16 parts per trillion, with no difference observed within the experimental uncertainty. 1
Magnetic moments offer an independent and complementary test. BASE-related measurements have reached fractional uncertainties of about 0.3 parts per billion for the proton and 1.5 parts per billion for the antiproton. 1 Improving the antiproton measurement is especially challenging because antiprotons must be produced, captured, cooled and studied in a working accelerator complex.
Why a quieter laboratory could improve the measurements
Penning-trap experiments infer particle properties from precisely measured motion and spin-precession frequencies. Small magnetic-field fluctuations, vibration, electrical noise and interruptions can limit how accurately those frequencies can be resolved.
The Antimatter Factory is essential for producing antiprotons, but it is not necessarily the quietest possible setting for their longest precision measurements. BASE-STEP was designed to carry antiprotons by road to magnetically calmer environments, where a dedicated laboratory can offer greater stability and longer uninterrupted runs. 5
The collaboration expects that this approach could improve magnetic-moment precision by at least a factor of 100. If achieved, that would turn today’s parts-per-billion proton–antiproton magnetic-moment comparison into a far tighter baryonic CPT test. It is a projected capability, however, rather than a precision result already delivered by the truck transport. 7
The next destination: Düsseldorf
The CERN campus journey is the operational precursor to a more ambitious transfer: an autonomous road trip expected to take about 10 hours from Geneva to a dedicated high-precision laboratory being established at Heinrich Heine University Düsseldorf. 7
Successfully completing that journey would make it possible to separate two tasks that have historically had to happen in the same place: producing antiprotons at CERN and measuring them in an exceptionally stable laboratory. BASE’s 92-antiproton transport does not change the current verdict—protons and antiprotons still agree within the limits of existing measurements—but it establishes a practical route to testing that agreement much more rigorously. 1
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In March 2026, CERN’s BASE collaboration transported 92 trapped antiprotons by truck across its Meyrin site and resumed operation afterward—the first such demonstration with free antimatter.
What are the key points to validate first?
In March 2026, CERN’s BASE collaboration transported 92 trapped antiprotons by truck across its Meyrin site and resumed operation afterward—the first such demonstration with free antimatter. BASE has already compared proton and antiproton charge to mass ratios to 16 parts per trillion; portable trapping could substantially improve complementary magnetic moment tests.
What should I do next in practice?
The next target is an autonomous road journey of roughly 10 hours from CERN to a high precision laboratory being established at Heinrich Heine University Düsseldorf.