The elementary theory of threshold phenomena in the excitation spectrum of superfluid 4He is presented. The multiphonon threshold in the initial part of the spectrum and the two-roton threshold at energy 2δ are discussed.
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Pitaevskii, L.P. Threshold phenomena in the excitation spectrum of liquid 4He. J Low Temp Phys 87, 445–451 (1992). https://doi.org/10.1007/BF00114913
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DOI: https://doi.org/10.1007/BF00114913