Abstract
We present the results of quasielastic small-angle neutron scattering study of deuterium clusters immersed in superfluid 4He. Diffraction intensities exhibit a very strong change in a character at temperatures above 1.95 K but below the λ point. They are compared with calculations based on the assumption that clusters with different sizes and structures as well as single molecules may contribute in a total diffraction pattern with their particular varied relative weights. We have found that small clusters with N<300 molecules intensively decrease in size and a big abundance of free deuterium molecules form inside superfluid 4He below the λ point that evidences in favor of instability of smallest deuterium clusters at 1.95<T<2.17 K while larger clusters undergo only minor growth.
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Krainyukova, N.V., Efimov, V.B. & Mezhov-Deglin, L.P. Instability of Small Deuterium Clusters in Superfluid Helium near the λ Point. J Low Temp Phys 171, 718–724 (2013). https://doi.org/10.1007/s10909-012-0728-y
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DOI: https://doi.org/10.1007/s10909-012-0728-y