The reflection of low energy phonons at the free surface of liquid4He. II. Experiment

Baddar, H.; Edwards, D. O.

doi:10.1007/bf00751860

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Cited by 5 publications

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“…No additional mass besides helium itself is involved in the motion and the quasiparticle scattering is presumably perfectly specular. This has been experimentally verified in the case of superfluid 4 He [11]. As the temperature is reduced deep below the superfluid transition temperature T c , the quasiparticle mean free path increases very rapidly and at about T ≈ T c /4 it can usually be assumed to exceed the typical dimensions of the experiment.…”

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confidence: 75%

Quasiparticle Damping of Surface Waves in Superfluid $^3$He and $^4$He

Manninen,

Rysti,

Todoshchenko

et al. 2014

Preprint

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Oscillations on free surface of superfluids at the inviscid limit are damped by quasiparticle scattering. We have studied this effect in both superfluids 3 He and 4 He deep below the respective critical temperatures. Surface oscillators offer several benefits over immersed mechanical oscillators traditionally used for similar purposes. Damping is modeled as specular scattering of ballistic quasiparticles from the moving free surface. The model is in reasonable agreement with our measurements for superfluid 4 He but significant deviation is found for 3 He.

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confidence: 75%