Anomalous viscosity transition of solid He-4 in nanodomains

Verified theory of absolute reaction rate or transition-state (originates from the quantum chemistry approach) as well as boundary perturbation method were applied to capturing the possible jump of shear viscosity for solid He-4 (with small He-3 impurities) passing through Vycor's pores which have in average a diameter around 7 nm. Via tuning of activation energies and activation volumes while fixing of forcing parameters we can obtain quantitatively the same temperatures at which the anomalous solid state transitions for flowing solid He-4 (with small He-3 concentrations) in confined nanodomains have been experimentally reported. Current open issues played by the role of He-3 impurities were also discussed. (C) 2017 Elsevier B.V. All rights reserved.