Temperature Dependence of the Absorption Coefficient of First Sound and Its Velocity in Liquid Helium II | Zendy

T. Kebukawa | Zendy

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Temperature Dependence of the Absorption Coefficient of First Sound and Its Velocity in Liquid Helium II

Author(s) -

T. Kebukawa

Publication year - 1974

Publication title -

progress of theoretical physics

Language(s) - English

Resource type - Journals

eISSN - 1347-4081

pISSN - 0033-068X

DOI - 10.1143/ptp.51.366

Subject(s) - liquid helium , attenuation coefficient , physics , second sound , absorption (acoustics) , helium , roton , hamiltonian (control theory) , noise reduction coefficient , temperature coefficient , helium 4 , thermodynamics , atomic physics , sound (geography) , materials science , optics , superfluid helium 4 , quantum mechanics , acoustics , mathematical optimization , mathematics , porosity , composite material

The temperature dependence of the absorption coefficient of first sound and its velocity in liquid helium II is investigated from a microscopic point of view on the basis of the Hamiltonian described in terms of the cannonical collective variables. Our result for the absorption coefficient is compared with the experimental data which yield a fairly good agreement at low frequency of sound and at low temperature. We also discuss the contri bution from thermal raton to the absorption coefficient, and the temperature dependence of sound velocity.

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