What does increase dramatically is the energy (and the mass). At the beginning of an experiment, a beam of electrons may have a rest energy of 1/2 million electron volts; it is directed through a ...

He called it a neutron, and imagined it as a paired proton and electron ... particle -- one with the same mass as a proton, but with zero charge. His experiments were successful.

To do so, these experiments aimed the electron beam generated in the Continuous Electron Beam Accelerator Facility (CEBAF), a DOE Office of Science user facility, at a polarized proton target—a ...