Soon after, they calculated that the lightest glueball would have a mass (expressed in energy units) of about 1,707 megaelectronvolts
The gamma ray line that followed had an energy of 0.511 megaelectronvolts
(MeV) - the energy signature you'd expect to see from positrons and electrons after a nuclear reaction.
At the MAMI electron accelerator at the University of Mainz in Germany, researchers use electron beams of 855 megaelectronvolts
to produce gamma rays for investigating proton polarization and related phenomena.
The roughly 90-meter-long (295 feet) Linac 4 will be more than thrice as strong as the currently used Linac 2, which accelerates protons to energies of about 50 megaelectronvolts