The scintillation properties of liquid helium upon the recoil of a low energy helium atom are discussed in the context of the possible use of this medium as a detector of dark matter. It is found that the prompt scintillation yield in the range of recoil energies from a few keV to 100 keV is somewhat higher than that obtained by a linear extrapolation from the measured yield for an 5 MeV alpha particle. A comparison is made of both the scintillation yield and the charge separation by an electric field for nuclear recoils and for electrons stopped in helium.
@article{arxiv.1303.3858,
title = {Scintillation of Liquid Helium for Low-Energy Nuclear Recoils},
author = {T. M. Ito and G. M. Seidel},
journal= {arXiv preprint arXiv:1303.3858},
year = {2013}
}