Comment on ``Measurement of the $^3$He mass diffusion coefficient in superfluid $^4$He over the 0.45--0.95 K temperature range
S.K. Lamoreaux, R. Golub
TL;DR
This paper clarifies that 3He-3He collisions do not affect the measurement of helium-3 diffusion in superfluid helium-4, focusing on the role of phonons in the process.
Contribution
It provides a clarification on the impact of 3He-3He collisions in diffusion measurements within superfluid helium-4.
Findings
3He-3He collisions are not relevant to the diffusion measurement
The diffusion against phonons is unaffected by 3He-3He collisions
The study refines understanding of helium isotope diffusion mechanisms
Abstract
The role of 3He-3He collisions in our diffusion experiment is addressed and shown to not be relevant to the measurement of 3He diffusion against phonons in superfluid helium.
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