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ALPHA-g clocks the freefall of antihydrogen – CERN Courier

The first direct experiment to observe a gravitational effect on the motion of antimatter opens a new avenue of experimental exploration.

Research shows antimatter falls under gravity

GBAR joins the anticlub – CERN Courier

The GBAR experiment at CERN has joined the select club of experiments that have succeeded in synthesising antihydrogen atoms.

GBAR joins the anticlub

The aim of the GBAR experiment at CERN is to measure the acceleration of an antihydrogen atom – the simplest form of atomic antimatter – in Earth's gravitational field, and to compare it with that of the normal hydrogen atom. Such a comparison is a crucial test of Einstein's equivalence principle, which states that the trajectory of a particle is independent of its composition and internal structure when it is only subjected to gravitational forces. But producing and slowing down an antiatom enough to see it in free fall is no mean feat. GBAR's approach is to first produce an antihydrogen atom and then turn it into a positive ion (the antimatter equivalent of an H- ion). Then the ion can be slowed down using quantum-optical techniques. Finally, the ion is neutralised for free-fall measurement. In a new paper, the GBAR collaboration reports the successful production of its first antiatoms. To achieve this, the team has developed a complex protocol in which antihydroge

GBAR joins anticlub