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VOLUME 57 (1993) | ISSUE 7 | PAGE 414
Two-branch structure of the spectrum of elementary excitations of superfluid helium-4
The spectrum of elementary excitations of Hell at wave vectors q~ 0.1-1.9 A-1 has been studied by a neutron-scattering method at temperatures Γ=0.42-1.72 K. At q>q0(T)~0A& A"1 and under the condition e > Δ, the spectrum has a two-branch structure.