@article{Berberich1976Inves-4672,
  year={1976},
  doi={10.1007/BF00655215},
  title={Investigation of the lifetime of longitudinal phonons at GHz frequencies in liquid and solid 4He},
  number={1-2},
  volume={22},
  journal={Journal of Low Temperature Physics},
  pages={61--84},
  author={Berberich, Paul and Leiderer, Paul and Hunklinger, Siegfried}
}

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    <dcterms:bibliographicCitation>First publ. in: Journal of Low Temperature Physics 22 (1976), 1-2, pp. 61-84</dcterms:bibliographicCitation>
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    <dc:creator>Berberich, Paul</dc:creator>
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    <dcterms:abstract xml:lang="eng">The attenuation of longitudinal 1-GHz phonons was measured as a function of temperature in liquid 4He at svp and at 23 bar as well as in hcp 4He at 36 bar. The lifetime of the phonons which were generated by stimulated Brillouin scattering was determined optically by a probing light pulse. The results in liquid 4He are discussed in terms of relaxation processes in the phonon and roton gas and are in good agreement with existing work. The attenuation in hcp 4He, which approximately shows a T 4 temperature dependence, is attributed to three-phonon processes with longitudinal thermal phonons. A quantitative comparison with Landau-Ruiner theory gives satisfactory agreement with the data. No effect of phonon dispersion on sound attenuation is found down to 0.8 K.</dcterms:abstract>
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    <dc:contributor>Berberich, Paul</dc:contributor>
    <dc:creator>Hunklinger, Siegfried</dc:creator>
    <dc:contributor>Hunklinger, Siegfried</dc:contributor>
    <dc:contributor>Leiderer, Paul</dc:contributor>
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    <dcterms:title>Investigation of the lifetime of longitudinal phonons at GHz frequencies in liquid and solid 4He</dcterms:title>
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    <dcterms:issued>1976</dcterms:issued>
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    <dc:creator>Leiderer, Paul</dc:creator>
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