Muonic Chamber (IMAGE)
Caption
In a measuring chamber for protons: the muon beam moves through the ring-shaped electrodes from the left. In the space between the two grey-metallic bars under the pane of glass the muons impact on gaseous hydrogen -- and displace the electrons from some of the atoms. The apparatus registers this process and fires a laser through the hole in the bottom bar onto the muonic hydrogen in order to reveal details of the atomic structure and thus ultimately the radius of the proton.
Credit
Image: Randolf Pohl / MPI of Quantum Optics
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