<Dd> m n = m d − m p + B d − E r d (\ displaystyle m_ (n) = m_ (d) - m_ (p) + B_ (d) - E_ (rd)) </Dd> <P> The energy of the gamma ray can be measured to high precision by X-ray diffraction techniques, as was first done by Bell and Elliot in 1948 . The best modern (1986) values for neutron mass by this technique are provided by Greene, et al. These give a neutron mass of: </P> <Dl> <Dd> m = 7000100864490400000 ♠ 1.008 644 904 (14) u </Dd> </Dl> <Dd> m = 7000100864490400000 ♠ 1.008 644 904 (14) u </Dd>

How do the charge and mass of a neutron