An experimental particle physicist who contributed to the discovery of the antiproton. A negative particle had to be distinguished from the much more abundant light particles with the same electric charge: momentum selection and velocity-sensitive detectors together established its large mass. Instrument design therefore formed part of identifying the new particle, alongside its production in an accelerator.[ref]
https://www2.lbl.gov/Science-Articles/Archive/Claude-Wiegand-obit.html. Berkeley Lab account: central role and contributions to the 1955 antiproton experiment
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