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Threshold phenomena in the excitation spectrum of liquid 4He |
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| Authors: | L. P. Pitaevskii |
| Affiliation: | (1) Kapitza Institute for Physical Problems, Moscow, Russia |
| Abstract: | 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 2 are discussed. |
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