Neutron Studies of Impurity Gels of Heavy Water and Deuterium in Superfluid He-II
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The main goal of this work is to explore feasibility of a new method for producing high density of ultra cold neutrons. The method proposed consists in the cooling of very cold neutrons owing to their many collisions with ultracold nanoparticles made of low adsorbing materials (heavy water, deuterium) down to the temperature of this particles during the diffusion motion of neutrons through a macroscopically large ensemble of nanoparticles—a sample of high porous impurity gel in superfluid He-II. At the first stage of this experimental program we have studied propagation and small angle scattering of cold neutrons in the gel samples cooled down to 1.6 K. The results obtained look very encouraging: estimated characteristic dimensions of impurity clusters are 3≤d≤150 nm for as-prepared deuterium gel sample and d≤15 nm for heavy-water gel samples. In the next series of experiments we plan to study the inelastic scattering of cold neutrons in the bulk of deuterium and heavy water gel samples.
KeywordsImpurity gels Nanoclusters Superfluid 4He Ultracold neutrons
PACS67.25.Dr 61.46.Bc 28.20.Gd
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