Answers are grounded in this paper and cite their sources.
We have observed the second-sound contribution to the Brillouin spectrum of liquid He⁴ near the λ transition at saturated vapor pressure and at 25.1 atm. Its spectral shape is compared with theoretical predictions. We have determined the intensity ratio of second- and first-sound scattering between 10^-5^∘K<T_λ-T<10^-1^∘K, and we present data on the dispersion and damping of high-frequency first and second sound.
No takes yet. Share an insight, caveat, or question.
Winterling et al. (1973) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: