Neutron Data Conversion Calculator
This tool allows you to convert between a neutron's energy, wavelength, and velocity. Enter a value in any of the fields to see the corresponding values calculated automatically.
Underlying Principles
The relationships between a neutron's energy, wavelength, and velocity are derived from de Broglie's hypothesis and kinetic energy equations. They are particularly useful for understanding low-energy neutrons, such as thermal and cold neutrons.
$$E = \frac{h^2}{2m\lambda^2}$$
$$E = \frac{1}{2}mv^2$$
Based on these principles, and using standard constants, the following practical formulas are used for conversion:
$$E_{meV} = \frac{81.82 \times 10^3}{(\lambda \text{Å})^2}$$
$$v_{m/s} = 3956 / (\lambda \text{Å}) = 437 \cdot \sqrt{E_{meV}}$$