Neutron reflection from a liquid helium surface

Neutron reflection from the liquid helium surface

Neutron Reflection from the Surfaces of Liquid

We report and discuss the first neutron reflection measurements from the free surfaces of normal and superfluid He and of a liquid He-He mixture. In case of liquid He the surface roughness is different above and below the lambda transition, being smoother in the superfluid state. For the superfluid, we also observe the formation of a surface layer ∼ 200 Å thick which has a subtly different neut...

A note on the ultracold neutron production by neutron deceleration on clusters in liquid helium

An evaluation of slow neutron deceleration through their interaction with nanoclusters in liquid helium is performed. It is shown that this process is strongly suppressed if clusters are bound by the van der Waals interaction. PACS: 28.20.-v; 25.40.Fq; 36.40.C; 63.22.Kn

Quantum reflection of helium atom beams from a microstructured grating

We observe high-resolution diffraction patterns of a thermal-energy helium-atom beam reflected from a microstructured surface grating at grazing incidence. The grating consists of 10-μm-wide Cr strips patterned on a quartz substrate and has a periodicity of 20 μm. Fully-resolved diffraction peaks up to the 7 order are observed at grazing angles up to 20 mrad. With changes in de Broglie waveleng...

Brilliant total reflection from a liquid-liquid interface.

In this paper I describe total reflection of great brilliancy that seems to indicate that an interface can be very thin.