Diffraction and Mirror Reflection of Ultracold Neutrons

Observation of ultracold-neutron production by 9-Å cold neutrons in superfluid helium

“…r 0 is 14 sec from Fig. 3(b) and this value is much shorter than expected from surface hydrogen contamination measurements [16][17][18][19] since at the very low temperatures, with hydrogen bound tightly to the surface, effective inelastic scattering on hydrogen is small [15]. However, for a UCN gas, one has…”

Time-of-flight Fourier UCN spectrometer

“…Specifically, the gravity UCN spectrometry [7][8][9][10][11][12][13][14] and the spectrometry based on the use of quantum spectrometric devices (various interference filters) [11,12,[15][16][17] have received widespread use.…”

Ultracold neutrons: Their role in studies of condensed matter

“…2 we see the results of UCN reflectivity measurements made on a mirror of borosilicate glass (Scheckenhofer and Steyerl, 1977). This is clear evidence that the potential-step model does not hold for the surface of the sample used, the data fitting much better to a potential given by…”

“…The measured intensity reflected from a glass mirror (points) compared with theoretical curves for (i) a step function and (ii) a smoothed step function for the wall scattering potential: broken curve, calculation for monoenergetic neutrons; full curve, calculation for the instrumental resolution. Assumption (ii) may be a model for a hydrogenous surface contamination (Scheckenhofer and Steyerl, 1977). Some initial steps in the development of UCN reflectometry have been taken by Gutsmiedl and Herrmann (Herrmann, 1990).…”