This is a constant representing the neutron's gyromagnetic ratio, `gamma_n`, also known as the magnetogyric ratio.
This constant represents the ratio of the neutron's magnetic dipole moment to its angular momentum. The electron gyromagnetic ratio is reported in SI units of `1/(s*T)` or `C/kg`.
This constant is specified with a standard uncertainty (standard deviation) of: 0.000 000 43 E8 `1 /(s*T)`