We present evidence showing that neutral excitations which are not photons are produced in superfluid liquid helium in the presence of a Po²¹⁰ alpha-particle source. At low temperatures these excitations travel through the liquid with negligible scattering. They have sufficient energy to generate positive ions and electrons at the surface of the liquid or at a suitable metal plate immersed in the liquid.
No takes yet. Share an insight, caveat, or question.
Surko et al. (1968) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: