NeutronUncharged elementary particle with a mass of 1.67492716 ·10... with an energyAbility to do work or diffuse heat. The unit of energy is th... beyond that of a slow neutronUncharged elementary particle with a mass of 1.67492716 ·10..., however lower than that of a fast neutronUncharged elementary particle with a mass of 1.67492716 ·10...; generally within the range of 10 and 100,000 eVSymbol for electron volt..