CONDENSED MATTER

On the energy spectrum of helium II

V. I. Marchenko, A. Ya. Parshin

Kapitza Institute for Physical Problems, Russian Academy of Sciences, ul. Kosygina 2, Moscow, 119334, Russia

Abstract: It is shown that the spectrum of the bulk excitations in helium II, which ends at the Pitaevskii point, should be recovered at a certain critical point with the coordinates of about several roton energies and momenta in the form of the spectrum of vortex rings. As the momentum increases, the spectrum of surface capillary waves should be transformed to the spectrum of surface vortex half-rings.

PACS: 67.

Received: 22.01.2008
Revised: 21.02.2002

 English version: Journal of Experimental and Theoretical Physics Letters, 2008, 87:6, 326–327

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