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A new determination of the roton energy in superfluid liquid helium

1977; IOP Publishing; Volume: 10; Issue: 3 Linguagem: Inglês

10.1088/0022-3719/10/3/002

1747-3802

A. D. B. Woods, Paul Hilton, R. Scherm, W. G. Stirling,

High-pressure geophysics and materials

The energies of excitations in the region of the minimum in the dispersion curve for superfluid liquid 4He have been determined at SVP and T=0.75K using neutron inelastic scattering. The value of Delta /k is 8.618+or-0.009K. Comparison with recent Raman-scattering measurements gives a value of the roton-roton binding energy of 0.027+or-0.04K at Q=0.