experiment operation with same antimatter after transport, overcoming limitation of antimatter being difficult to preserve as it annihilates upon contact with matter.

Measurements

In July 2011, the ASACUSA experiment at CERN determined the mass of the antiproton to be times that of the electron. This is the same as the mass of a proton, within the level of certainty of the experiment.

In October 2017, scientists working on the BASE experiment at

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