Response of a diamond detector, 4.5 mm × 4.5 mm, thickness 500μm, to 20.491 MeV neutrons. Top: FLUKA simulation (red curve), compared to experimental data [209] (blue line). The normalization is arbitrary, simulations have been smeared with a Gaussian resolution as derived from the highest energy peak. Bottom: energy deposition spectra from the different charged reaction products. Please note that no peak shows up in the bottom plot, since they are due to the combination of (for example) an α particle and the corresponding ⁹Be recoil.