Compute the incident energy from the incident wavelength.
The result is
\[E_i = \frac{h^2}{2 m_n \lambda_i^2}\]
Where \(m_n\) is the neutron mass and \(h\) the Planck constant.
- Parameters:
incident_wavelength (Variable) – Incident neutron wavelength \(\lambda_i\).
- Returns:
Variable – Incident energy \(E_i\).
Has unit meV.
