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