CERN 98d ago

Today, in a world first, a team of scientists from the BASE experiment at CERN successfully transported a trap filled with antiprotons in a truck across the Laboratory’s main site. The team managed to accumulate a cloud of 92 antiprotons in an innovative portable cryogenic Penning trap, then disconnect it from the experimental facility, load it onto a truck and continue experiment operation after transport. This is a remarkable achievement, given that antimatter is very difficult to preserve, as it annihilates upon contact with matter. This world premiere is a test, the ultimate aim being to transport antiprotons to other European laboratories, such as Heinrich Heine University Düsseldorf (HHU), where very-high-precision measurements of the antiproton properties could be performed. Antimatter is a naturally occurring class of particles that is almost identical to ordinary matter except that the electric charge and magnetic moment are reversed. According to the laws of physics, the Big Bang should have produced equal amounts of matter and antimatter. These equal-but-opposite particles would have quickly annihilated each other, leaving an empty Universe. However, our Universe contains predominantly matter, and this imbalance has baffled scientists for decades. Physicists suspect that there are hidden differences that may explain why matter survived and antimatter all but disappeared. To deepen our understanding of antimatter, the BASE collaboration aims to precisely measure the properties of antiprotons, such as their intrinsic magnetic moment, and then compare these measurements with those taken with protons. But they now face a problem: “The machines and equipment in CERN’s ‘antimatter factory’, where BASE is located, generate magnetic field fluctuations that limit how far we can push our precision measurements,” explains Stefan Ulmer, Spokesperson of BASE. These fluctuations are minuscule, of the order of one billionth of a tesla, 20 000 times smaller than the magnetic field of the earth, and undetectable outside the building. “However, the precision of the measurements taken in BASE is such that gaining an even deeper understanding of the fundamental properties of antiprotons will require moving the experiment out of the building.”, says Stefan Ulmer. Read more: https://home.cern/news/press-release/experiments/base-experiment-cern-succeeds-transporting-antimatter