Compute the wavelength from the neutron energy.
The result is the de Broglie wavelength
\[\lambda = \frac{h}{\sqrt{2 m_n E}}\]
Where \(m_n\) is the neutron mass and \(h\) the Planck constant.
- Parameters:
energy (Variable) – Neutron energy \(E\).
- Returns:
Variable – Wavelength \(\lambda\).
Has unit ångström.
