Neutron Compton Scattering measurements in a variety of materials have shown a relative deficit in the total signal from hydrogen compared to deuterium and heavier ions. We show here that a breakdown in the Born-Oppenheimer approximation in the final states of the scattering process leads to such a deficit, and may be responsible for the effect.
@article{arxiv.cond-mat/0403599,
title = {On the Origin of the Intensity Deficit in Neutron Compton Scattering},
author = {G. F. Reiter and P. M. Platzman},
journal= {arXiv preprint arXiv:cond-mat/0403599},
year = {2009}
}