GBAR experiment facility

Numéro d’image : 14112693
GBAR experiment facility
GBAR (Gravitational Behaviour of Antihydrogen at Rest) experiment facility at CERN (European Particle Physics Laboratory). This experiment aims to measure the freefall acceleration of antimatter under gravity. To achieve this, the GBAR experiment starts by combining antiprotons with two antielectrons to create antihydrogen ions with a positive charge. These ions are then brought to microkelvin (approx. -273 degrees Celsius) temperatures using laser-cooling techniques before being stripped of the additional antielectron, transforming them into antihydrogen atoms. The antihydrogen atoms are then allowed to fall from a height of 20 centimetres, and their annihilation at the end of the fall is recorded. By measuring the acceleration of antihydrogen under gravity and comparing it with the acceleration of regular hydrogen, GBAR scientists can detect differences in the behaviour of matter and antimatter. They are also testing the equivalence principle proposed by Albert Einstein, which states that gravitational force on a particle is independent of its internal structure and composition.
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Crédit: Science Photo Library / CERN / Julien Ordan / Brice Maximilien
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