A proton is a stable subatomic particle, symbol p, H⁺, or ¹H⁺ with a positive electric charge of +1 e. Its mass is slightly less than the mass of a neutron and approximately 1836 times the mass of an electron. From Wikipedia
Crystal collimators have entered testing; the LHCf detector records proton–oxygen collision data to ready the accelerator for upcoming oxygen–oxygen and neon–neon experiments.
