For xenon at temperature t 19.3 °C in a range of density 0.3 g/cm3 p 1 .0 g/cm3 SBS gain coefficient (g) and phonon lifetimes are measured. It is shown that at the densities higher than p 0,5 g/cm3 SBS gain g levels out, reaching the value g 100 cm/OW, and the phonon lifetimes decrease down to 'rh 25 ns with approaching to a critical point of Xe.
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