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VOLUME 21 (1975) | ISSUE 11 | PAGE 670
Two modes of collective excitations of a Fermi-liquid drop and sum rules for electromagnetic transitions in atomic nuclei
The problem of the appearance of low-lying collective excitations in a drop of normal Fermi liquid is considered. In a quantum drop there are two collective-excitations modes, rather than one, the lower being the analog of ordinary capillary waves and the other the analog of zero sound. It is shown that both modes make comparable contributions to the sum rule.